title stringlengths 10 172 | question_id int64 469 40.1M | question_body stringlengths 22 48.2k | question_score int64 -44 5.52k | question_date stringlengths 20 20 | answer_id int64 497 40.1M | answer_body stringlengths 18 33.9k | answer_score int64 -38 8.38k | answer_date stringlengths 20 20 | tags list |
|---|---|---|---|---|---|---|---|---|---|
Crazy but minor issue in grid-based game | 39,030,278 | <p>This has been really bugging me. I'm creating a game where a hero moves on a grid and part of it involves a collision check. The collision check stops the hero from moving in a direction if something already occupies the grid there.</p>
<p>It works for all directions except down. I can't see why?! It's the same str... | -1 | 2016-08-19T02:34:36Z | 39,049,865 | <p>The problem in the <code>CollisionCheck()</code> method for the <code>if Direction == "DOWN":</code> case is that whenever the <code>len(Map.Grid[self.Column][self.Row+1])</code> is less than 2, the method returns <code>None</code> <em>not</em> the <code>False</code> value <code>Move()</code> explicitly checks for, ... | 2 | 2016-08-20T02:20:55Z | [
"python",
"python-3.x",
"oop",
"pygame"
] |
How to delete the last item of a collection in mongodb | 39,030,332 | <p>I made a program with python and mongodb to do some diaries. Like this</p>
<p><a href="http://i.stack.imgur.com/8othU.png" rel="nofollow"><img src="http://i.stack.imgur.com/8othU.png" alt="slice diary"></a></p>
<p>Sometimes I want to delete the last sentence, just by typing "delete!"
But I dont know how to delete ... | 0 | 2016-08-19T02:42:58Z | 39,030,354 | <p>Be it first or last item, <code>MongoDB</code> maintains unique <code>_id</code> key for each record and thus you can just pass that id field in your delete query either using <code>deleteOne()</code> or <code>deleteMany()</code>. Since only one record to delete you need to use <code>deleteOne()</code> like</p>
<pr... | 0 | 2016-08-19T02:46:08Z | [
"python",
"mongodb",
"collections"
] |
NumPy array element not getting updated | 39,030,366 | <p>I have a NumPy array as follows:</p>
<pre><code>supp = np.array([['A', '5', '0'], ['B', '3', '0'], ['C', '4', '0'], ['D', '1', '0'], ['E', '2', '0']])
</code></pre>
<p>Now, I want to update the row[2] as row[1]/6.
I'm using..</p>
<p><code>for row in supp:
row[2] = row[1].astype(int) / 6</code></p>
<p>But row... | 2 | 2016-08-19T02:47:06Z | 39,030,429 | <p>The problem is that an <code>np.array</code> has only one type which is automatically assumed to be strings <code>supp.dtype == '|S1'</code> since your input contains only strings of length <code>1</code>. So numpy will automatically convert your updated inputs to strings of length <code>1</code>, <code>'0'</code>s ... | 4 | 2016-08-19T02:55:33Z | [
"python",
"arrays",
"python-3.x",
"numpy"
] |
Cython and numpy | 39,030,546 | <p>Try to run Example 7-11 of <strong>High Performance Python</strong></p>
<p><strong>cython_np.pyx</strong></p>
<pre><code>#cython_np.pyx
import numpy as np
cimport numpy as np
def calculate_z(int maxiter, double complex[:] zs, double complex[:] cs):
cdef unsigned int i, n
cdef double complex z, c
cdef i... | -1 | 2016-08-19T03:12:11Z | 39,030,954 | <p>I think, based on examples in <a href="http://docs.cython.org/en/latest/src/userguide/memoryviews.html" rel="nofollow">http://docs.cython.org/en/latest/src/userguide/memoryviews.html</a></p>
<pre><code>double complex[:] zs
</code></pre>
<p>defines a 1d memoryview with <code>double complex</code> dtype. This is si... | 0 | 2016-08-19T04:08:21Z | [
"python",
"numpy",
"cython"
] |
How can I have my script run certain days / months | 39,030,624 | <p>I have just created a python script that automatically renews my pass. Is it possible to make the script run like a app or a background program to check if it is a certain day of a month and to run it?</p>
| -2 | 2016-08-19T03:23:09Z | 39,030,743 | <p>That's just scheduled task.</p>
<p>In your task call python.exe, pass your script as an argument and that's it.</p>
| 0 | 2016-08-19T03:39:08Z | [
"python",
"selenium"
] |
CUDA histogram2d not working | 39,030,738 | <p>Due to a seeming lack of a decent 2D histogram for CUDA (that I can find... pointers welcome), I'm trying to implement it myself with pyCUDA.</p>
<p>Here's what the histogram should look like (using Numpy):</p>
<p><a href="http://i.stack.imgur.com/ThdCb.png" rel="nofollow"><img src="http://i.stack.imgur.com/ThdCb.... | -1 | 2016-08-19T03:38:14Z | 39,040,518 | <p>The array being allocated for the output array for the CUDA section used Numpy's default float64 instead of float32, so memory was twice as large as expected. Here's the new histogram output:</p>
<p><a href="http://i.stack.imgur.com/whUpm.png" rel="nofollow"><img src="http://i.stack.imgur.com/whUpm.png" alt="New CU... | 0 | 2016-08-19T13:39:35Z | [
"python",
"numpy",
"cuda",
"pycuda",
"histogram2d"
] |
Accessing dataframes in different notebooks in google data lab | 39,030,914 | <p>I am using google cloud data lab, and I have several data frames in different notebooks. Is there any way to access all these data frames in one notebook? I use SQL and python for writing the codes.</p>
<p>The data frames are the base tables for user engagement in an android app. These base tables are user data, ex... | 1 | 2016-08-19T04:03:08Z | 39,039,925 | <p>To access functions/variables from other notebooks in Google Cloud Datalab, simply run the other notebooks from your current notebook using the line magic command <code>%run</code></p>
<p>For example:</p>
<ol>
<li>Create a notebook called <code>'notebook_a.ipynb'</code></li>
<li>In the notebook, enter the followin... | 1 | 2016-08-19T13:09:55Z | [
"python",
"google-cloud-datalab"
] |
Unpack a string into an expanded string | 39,031,019 | <p>I am given a string in the following format: <code>"a{1;4:6}"</code> and <code>"a{1;2}b{2:4}"</code> where the <code>;</code> represents two different numbers, and a <code>:</code> represents a sequence of numbers. There can be any number of combinations of semicolons and colons within the brace.</p>
<p>I want to e... | 1 | 2016-08-19T04:15:44Z | 39,031,504 | <pre><code>import re
def expand(compressed):
# 'b{2:4}' -> 'b{2;3;4}' i.e. reduce the problem to just one syntax
normalized = re.sub(r'(\d+):(\d+)', lambda m: ';'.join(map(str, range(int(m.group(1)), int(m.group(2)) + 1))), compressed)
# 'a{1;2}b{2;3;4}' -> ['a{1;2}', 'b{2;3;4}']
elements = re.... | 4 | 2016-08-19T05:09:23Z | [
"python"
] |
Unpack a string into an expanded string | 39,031,019 | <p>I am given a string in the following format: <code>"a{1;4:6}"</code> and <code>"a{1;2}b{2:4}"</code> where the <code>;</code> represents two different numbers, and a <code>:</code> represents a sequence of numbers. There can be any number of combinations of semicolons and colons within the brace.</p>
<p>I want to e... | 1 | 2016-08-19T04:15:44Z | 39,032,210 | <p>I tried pyparsing for that and IMHO it produced a pretty readable code (took pack_tokens from the previous answer).</p>
<pre><code>from pyparsing import nums, Literal, Word, oneOf, Optional, OneOrMore, Group, delimitedList
from string import ascii_lowercase as letters
# transform a '123' to 123
number = Word(nums)... | 7 | 2016-08-19T06:12:41Z | [
"python"
] |
Unpack a string into an expanded string | 39,031,019 | <p>I am given a string in the following format: <code>"a{1;4:6}"</code> and <code>"a{1;2}b{2:4}"</code> where the <code>;</code> represents two different numbers, and a <code>:</code> represents a sequence of numbers. There can be any number of combinations of semicolons and colons within the brace.</p>
<p>I want to e... | 1 | 2016-08-19T04:15:44Z | 39,035,866 | <p>Just to demonstrate a technique for doing this using <code>eval</code> (as @ialcuaz asked in the comments). Again I wouldn't recommend doing it this way, the other answers are more appropriate. This technique can be useful when the structure is more complex (i.e. recursive with brackets and so on) when you don't w... | 2 | 2016-08-19T09:43:52Z | [
"python"
] |
define a function like numpy transpose and inverse | 39,031,127 | <p>i would define a function like calculating of inverse <code>np.matrix.I</code>:</p>
<pre><code>class matrix:
def __init__(self, data):
self.data = data
self.I = 1.0/data
def inv(self):
return 1.0/self.data
if __name__ == '__main__':
m = matrix(10)
m.I
</code></pre>
<p>it is possible to get c... | -1 | 2016-08-19T04:28:12Z | 39,031,323 | <p>You could do this with a <code>property</code>:</p>
<pre><code>class matrix:
def __init__(self, data):
self.data = data
@property
def I(self):
return 1.0/self.data
if __name__ == '__main__':
m = matrix(10)
print m.I # 0.1
m.data = 20
print m.I # 0.05
</code></pre>
<p>(As an aside, I cal... | 2 | 2016-08-19T04:49:27Z | [
"python",
"numpy"
] |
Error running socket.io and express-nodejs setup | 39,031,156 | <p>I was working on nodejs executing python scripts using spawn and socket.io methods. I am getting output on the console. but I am not able to display it on the browser. It is showing error.I have pasted the error below. Can any one please help me in solving this problem. I have got this example from <a href="http://s... | 0 | 2016-08-19T04:31:30Z | 39,031,212 | <p>You haven't started a web server anywhere or hooked socket.io to it. There are several different ways to do this, but here's one that works:</p>
<pre><code>var express = require('express');
var app = express();
var server = require('http').Server(app);
var io = require('socket.io')(server);
server.listen(80);
</c... | 2 | 2016-08-19T04:37:38Z | [
"javascript",
"python",
"node.js",
"express",
"socket.io"
] |
Import single OBJ files into Maya, moving and rotating it with Python/MEL | 39,031,168 | <p>Hi I have this code to import OBJ files into maya with Python</p>
<p>**</p>
<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>import maya.cmds as cmds
pathOfFiles = "/Path/... | 0 | 2016-08-19T04:32:41Z | 39,060,775 | <p>This looks like a fun challenge, so here's my attempt at answering it:</p>
<pre><code>import maya.cmds as cmds
import glob
#1. Import an individual OBJ file at once
def importFile(i):
cmds.file(i, i=True, groupReference=True, groupName="myobj")
#2. Move and rotate the imported file
def moveFile():
cmds.se... | 0 | 2016-08-21T04:11:59Z | [
"python",
"import",
"rendering",
"maya"
] |
what does "by = lambda x: lambda y: getattr(y, x)" mean? | 39,031,255 | <p>There is a dataFrame named "subset" and the codes are as follows. pd is the nickname of pandas. I can't figure out the meaning of <code>by = lambda x: lambda y: getattr(y, x)</code>.</p>
<pre><code>pivot = pd.pivot_table(subset, values='count', rows=['date'], cols=['sample'], fill_value=0)
by = lambda x: lambda y: ... | 2 | 2016-08-19T04:42:01Z | 39,031,305 | <p><code>by = lambda x: lambda y: getattr(y, x)</code> is equivalent to the following:</p>
<pre><code>def by(x):
def getter(y):
return getattr(y, x)
return getter
</code></pre>
<p><code>getattr(a, b)</code> gets an attribute with the name <code>b</code> from an object named <code>a</code>.</p>
<p>So ... | 2 | 2016-08-19T04:47:58Z | [
"python",
"pandas",
"lambda"
] |
Unity - How to reduce time spent in Update and GC | 39,031,315 | <p>I have script in Unity that is exchanging data with another Python app. It has a while loop that listens for UDP messages as a background thread. Also the script is asking for new data every frame via the Update function.</p>
<p>After I receive a message, the script parses it as a string and it needs to split the s... | 0 | 2016-08-19T04:48:56Z | 39,035,947 | <ol>
<li><p>I can see a lot of local variables in your while loop (along with arrays). Local variables cause Garbage collector to run. You should declare all the variables outside of the method.</p></li>
<li><p>Moreover, avoid string operations in <code>while/update()</code> as <a href="http://stackoverflow.com/a/42742... | 0 | 2016-08-19T09:48:29Z | [
"c#",
"python",
"multithreading",
"unity3d",
"garbage-collection"
] |
windows python stdout and stderr to two different files | 39,031,332 | <p>I would like to output the stdout and stderr to two different log files.
i have tried this code but it only outputs the error to error log , but output is not redirected to runtime.log file. </p>
<p>the code is being run on windows and mostly robocopy is done in the code. </p>
<pre><code>saveerr = sys.stderr ... | 0 | 2016-08-19T04:49:59Z | 39,031,459 | <p>As mentioned in my comment your code should divert <strong>your</strong> stdout to the file. To get robocopy's stdout to go there too just echo each line to your stdout as shown in this link</p>
<p><a href="http://stackoverflow.com/a/28319191/6550457">http://stackoverflow.com/a/28319191/6550457</a></p>
<hr>
<pre>... | 3 | 2016-08-19T05:05:34Z | [
"python",
"windows",
"cmd"
] |
Spotify - get playlist track names | 39,031,363 | <p>on <code>search endpoint</code>, one can retrieve <code>playlist</code> data, for instance:</p>
<pre><code>def search_playlist():
results = sp.search(q='doom metal', type='playlist')
</code></pre>
<p>if add this to the code:</p>
<pre><code> items = results['playlists']['items'][0]['tracks']
print (ite... | 0 | 2016-08-19T04:54:33Z | 39,044,777 | <p><a href="https://github.com/plamere/spotipy/blob/master/examples/user_playlists_contents.py" rel="nofollow">https://github.com/plamere/spotipy/blob/master/examples/user_playlists_contents.py</a></p>
<pre><code>def show_tracks(results):
for i, item in enumerate(tracks['items']):
track = item['track']
print("... | 0 | 2016-08-19T17:32:57Z | [
"python",
"spotify",
"spotipy"
] |
Selenium and Javascript | 39,031,535 | <p>I'm trying to learn how to use selenium. I'm trying to work on creating script to like instagram photos; however, i'm running into a problem where xpath won't detect the image i want to click. I think this is probably due to the fact it's a javascript button.</p>
<p>This is a picture of the element i am inspecting.... | 0 | 2016-08-19T05:12:13Z | 39,032,673 | <p>Try <code>driver.find_element_by_xpath("//a[@class='thumb-shadow']/img").cââlick()</code></p>
| 0 | 2016-08-19T06:45:30Z | [
"python",
"selenium"
] |
I am thinking Web Crawler but how to start? | 39,031,548 | <p>I am working at a company that deals with phish and fake Facebook accounts. I want to show my dedication to the "mission". We are unable to passively monitor facebook pages for when they are removed. I am thinking a web crawler but I am curious on how to design one that constant checks a specific link to see if t... | -1 | 2016-08-19T05:14:35Z | 39,031,836 | <p>Yes! You can use crawling. However, if you want it to be as fast as possible, crawling may not be the best way to do it. If you're interested this is how I'd do it using HTTPConnection. also, unfortunately, the link has to be <em>completely</em> broken.</p>
<p>If you need more information then you will most likely ... | 1 | 2016-08-19T05:42:57Z | [
"python",
"facebook"
] |
I am thinking Web Crawler but how to start? | 39,031,548 | <p>I am working at a company that deals with phish and fake Facebook accounts. I want to show my dedication to the "mission". We are unable to passively monitor facebook pages for when they are removed. I am thinking a web crawler but I am curious on how to design one that constant checks a specific link to see if t... | -1 | 2016-08-19T05:14:35Z | 39,032,196 | <p>You can send a http request to tell the account is active or not by it's response status, Python has some standard library, you may have a look at <a href="https://docs.python.org/3/library/internet.html" rel="nofollow">Internet Protocols and Support</a>.
Personally, I will recommend use requests:</p>
<pre><code>im... | 0 | 2016-08-19T06:11:53Z | [
"python",
"facebook"
] |
I am thinking Web Crawler but how to start? | 39,031,548 | <p>I am working at a company that deals with phish and fake Facebook accounts. I want to show my dedication to the "mission". We are unable to passively monitor facebook pages for when they are removed. I am thinking a web crawler but I am curious on how to design one that constant checks a specific link to see if t... | -1 | 2016-08-19T05:14:35Z | 39,032,243 | <p><a href="https://www.quora.com/How-can-I-build-a-web-crawler-from-scratch/answer/Raghavendran-Balu" rel="nofollow">https://www.quora.com/How-can-I-build-a-web-crawler-from-scratch/answer/Raghavendran-Balu</a>
One of the best articles I have read about Crawlers.</p>
<p>A web crawler might sound like a simple fetch-p... | 0 | 2016-08-19T06:15:19Z | [
"python",
"facebook"
] |
How do I change the parsing order of the rules? | 39,031,596 | <p><a href="https://github.com/EricsonWillians/Lilith" rel="nofollow">I'm developing a programming language</a>, and I'm having trouble dealing with condition statements. Here's the code in my language:</p>
<pre><code>x = 4 ->
? 2 > 5 <?
x = 7 ->
?> ->
[o] <- x ->
</code></pre>
<p>Here's ... | 4 | 2016-08-19T05:18:38Z | 39,032,555 | <p>When a production is <em>reduced</em> -- that is, its semantic action is executed -- all of the non-terminals referenced have already been reduced. In other words, children are always reduced before their parents, which is why yacc is called a bottom-up parser.</p>
<p>The only practical way to achieve more flexibi... | 1 | 2016-08-19T06:37:29Z | [
"python",
"parsing",
"yacc",
"ply"
] |
Is there a better way to work with result from JSON and check whether it's blank or not | 39,031,617 | <p>I am trying to use the PostCodeAPI (<a href="http://postcodeapi.com.au/" rel="nofollow">http://postcodeapi.com.au/</a>) to get Australian postal information based on postcode. </p>
<p>Below would work successfully if a correct postcode is entered in the url (such as 2601.json). </p>
<p>I have used try-except to ca... | 0 | 2016-08-19T05:21:07Z | 39,031,985 | <p>For me if is also required .Still urllib2 is old requests is much simpler for rest api's and web requests.</p>
<blockquote>
<p>class NoDataException(Exception):<br></p>
<blockquote>
<p>print("No Data Received ")</p>
</blockquote>
<p>import requests</p>
<p>url='<a href="http://v0.postcodeapi.c... | 0 | 2016-08-19T05:54:32Z | [
"python",
"json"
] |
Is there a better way to work with result from JSON and check whether it's blank or not | 39,031,617 | <p>I am trying to use the PostCodeAPI (<a href="http://postcodeapi.com.au/" rel="nofollow">http://postcodeapi.com.au/</a>) to get Australian postal information based on postcode. </p>
<p>Below would work successfully if a correct postcode is entered in the url (such as 2601.json). </p>
<p>I have used try-except to ca... | 0 | 2016-08-19T05:21:07Z | 39,032,062 | <p>Unless you absolutely need to use <code>urllib2</code>, I'd suggest using the <a href="http://docs.python-requests.org/en/master/%20requests" rel="nofollow">requests</a> library. It's a more user-friendly HTTP client and does not raise an HTTPError when encountering an HTTP 404. If a 404 is encountered, you shouldn'... | 0 | 2016-08-19T06:01:47Z | [
"python",
"json"
] |
Is there a better way to work with result from JSON and check whether it's blank or not | 39,031,617 | <p>I am trying to use the PostCodeAPI (<a href="http://postcodeapi.com.au/" rel="nofollow">http://postcodeapi.com.au/</a>) to get Australian postal information based on postcode. </p>
<p>Below would work successfully if a correct postcode is entered in the url (such as 2601.json). </p>
<p>I have used try-except to ca... | 0 | 2016-08-19T05:21:07Z | 39,032,431 | <p>The simplest way I can think of, is this:</p>
<pre><code>import requests
import json.decoder.JSONDecodeError
try:
data = requests.get(url, headers=headers).json()
except json.decode.DecodeError:
print("No data")
.. # rest of your code
</code></pre>
<p>This is similar to your code's <code>try/except</code> ... | 0 | 2016-08-19T06:28:28Z | [
"python",
"json"
] |
Detecting 'Fold' of a webpage without loading it in a browser | 39,031,809 | <p>Is it possible to detect <code>Fold</code> of a webpage without actually loading it in Web Browser ?</p>
<p>Say I have got 5 URLs, and I wish to know the fold position for these 5 URLs without loading them. More like a batch operation.
Can this be done using <code>Java/Javascript/Python ?</code></p>
| 0 | 2016-08-19T05:40:05Z | 39,032,500 | <p>A 'Fold' is more or less a design principle from back in the days, when responsive wasn't a thing yet. Nowadays I wouldn't care too much about the 'fold', but ask yourself the question: 'why bother about the fold?'.</p>
<p>A great article you (or your designer) should read: <a href="http://iampaddy.com/lifebelow600... | 0 | 2016-08-19T06:33:45Z | [
"javascript",
"java",
"python",
"html"
] |
I can't decode encoded text using python | 39,032,019 | <pre><code>from base64 import b64decode
uio = input("Please enter the text you want to decode...")
pu = b64decode(uio.decode())
print("Decode text : ")
print(pu)
</code></pre>
<p>It tells me this : -</p>
<pre><code>pu = b64decode(uio.decode())
AttributeError: 'str' object has no attribute 'decode'
</code></pre>
<p>... | -2 | 2016-08-19T05:57:38Z | 39,032,057 | <p>You're trying to <code>decode()</code> a string object. That does not work.
simply remove that and it should not raise an error anymore, like so:</p>
<pre><code>pu = b64decode(uio)
</code></pre>
<p>If you're not certain there's always a string object do this:</p>
<pre><code>try:
pu = b64decode(uio.decode('utf... | 1 | 2016-08-19T06:01:31Z | [
"python",
"decode"
] |
I can't decode encoded text using python | 39,032,019 | <pre><code>from base64 import b64decode
uio = input("Please enter the text you want to decode...")
pu = b64decode(uio.decode())
print("Decode text : ")
print(pu)
</code></pre>
<p>It tells me this : -</p>
<pre><code>pu = b64decode(uio.decode())
AttributeError: 'str' object has no attribute 'decode'
</code></pre>
<p>... | -2 | 2016-08-19T05:57:38Z | 39,032,096 | <p>In Python 3, all strings are unicode. Thus, decode is not necessary. (Also, you are supposed to specify an encoding anyways :) ). Example:</p>
<pre><code>pu = b64decode(uio.decode("utf-8"))
</code></pre>
| -1 | 2016-08-19T06:04:31Z | [
"python",
"decode"
] |
Generating XML file with proper indentation | 39,032,046 | <p>I am trying to generate the XML file in python but its not getting indented the out put is coming in straight line.</p>
<pre><code>from xml.etree.ElementTree import Element, SubElement, Comment, tostring
name = str(request.POST.get('name'))
top = Element('scenario')
environment = SubElement(top, 'environment') ... | 1 | 2016-08-19T06:00:19Z | 39,032,366 | <p>You cannot directly parse <code>top</code> which is an <code>Element()</code>, you need to make that into a string (which is why you should import <code>tostring</code> that you are currently not using), and use <code>xml.dom.minidom.parseString()</code> on the result:</p>
<pre><code>import xml.dom.minidom
xml_p =... | 1 | 2016-08-19T06:24:20Z | [
"python",
"xml",
"xml-parsing",
"xml.etree"
] |
How to get cut a few value in to different col in python dataframeï¼ | 39,032,119 | <p>I have a data frame like followingï¼</p>
<pre><code> pop state year value1 value2 value3
0 1.8 Ohio 2000001 3 3 1
1 1.9 Ohio 2001001 3 3 1
2 3.9 Nevada 2002 3 3 1
3 2.9 Nevada 2001003 3 ... | 2 | 2016-08-19T06:06:12Z | 39,034,575 | <p>You can cast <code>year</code> to take string values followed by <a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.Series.str.extract.html" rel="nofollow"><code>str.extract</code></a> to extract the specific slices corresponding to the values in the 3 columns.</p>
<p>You could then replace the e... | 2 | 2016-08-19T08:35:36Z | [
"python",
"pandas",
"dataframe"
] |
Converting Python List to Numpy Array InPlace | 39,032,200 | <p>I have a python list that's huge (16 GB) and I want to convert it to numpy array, inplace. I can't afford this statement</p>
<pre><code>huge_array = np.array(huge_list).astype(np.float16)
</code></pre>
<p>I'm looking for some efficient ways to transform this <code>huge_list</code> into <code>numpy array</code> wit... | 2 | 2016-08-19T06:12:04Z | 39,033,240 | <p>As I previously mentioned, the easiest would be to just dump the array to a file and then load that file as a numpy array.</p>
<p>First we need the size of the huge list: </p>
<pre><code>huge_list_size = len(huge_list)
</code></pre>
<p>Next we dump it to disk</p>
<pre><code>dumpfile = open('huge_array.txt... | 2 | 2016-08-19T07:19:35Z | [
"python",
"arrays",
"list",
"numpy",
"in-place"
] |
Converting Python List to Numpy Array InPlace | 39,032,200 | <p>I have a python list that's huge (16 GB) and I want to convert it to numpy array, inplace. I can't afford this statement</p>
<pre><code>huge_array = np.array(huge_list).astype(np.float16)
</code></pre>
<p>I'm looking for some efficient ways to transform this <code>huge_list</code> into <code>numpy array</code> wit... | 2 | 2016-08-19T06:12:04Z | 39,034,913 | <p><code>np.array(huge_list, dtype=np.float16)</code> will be faster, since it only copies the list once and not twice</p>
<hr>
<p>You probably don't need to worry about making this copy, because the copy is a lot smaller than the original:</p>
<pre><code>>>> x = [float(i) for i in range(10000)]
>>>... | 2 | 2016-08-19T08:55:13Z | [
"python",
"arrays",
"list",
"numpy",
"in-place"
] |
Converting Python List to Numpy Array InPlace | 39,032,200 | <p>I have a python list that's huge (16 GB) and I want to convert it to numpy array, inplace. I can't afford this statement</p>
<pre><code>huge_array = np.array(huge_list).astype(np.float16)
</code></pre>
<p>I'm looking for some efficient ways to transform this <code>huge_list</code> into <code>numpy array</code> wit... | 2 | 2016-08-19T06:12:04Z | 39,072,596 | <p>You can use <code>numpy</code>'s <code>save</code> and <code>load</code> functions:</p>
<p>You can use a normal python list as an argument to <code>np.save</code> and <code>np.load</code> will load directly into a numpy array.</p>
<p>Example:
</p>
<pre><code>from tempfile import TemporaryFile
outfile = TemporaryF... | 0 | 2016-08-22T06:28:30Z | [
"python",
"arrays",
"list",
"numpy",
"in-place"
] |
Merge two dataframes with python | 39,032,204 | <p>I have two dataframes :dfDepas and df7 ; </p>
<pre><code>dfDepas.info()
<class 'pandas.core.frame.DataFrame'>
Int64Index: 7 entries, 0 to 6
Data columns (total 4 columns):
day_of_week 7 non-null object
P_ACT_KW 7 non-null float64
P_SOUSCR 7 non-null float64
depassement 7 non-null float64
dty... | 3 | 2016-08-19T06:12:18Z | 39,032,246 | <p>You can use <a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.reset_index.html" rel="nofollow"><code>reset_index</code></a> and rename column <code>0</code> to <code>day_of_week</code> for matching:</p>
<pre><code>merged_df = pd.merge(dfDepas,
df7.reset_index().re... | 3 | 2016-08-19T06:15:23Z | [
"python",
"pandas",
"merge"
] |
How do I use a trained Matlab Neural Network to Python for detection purpose | 39,032,261 | <p>I have trained a Neural Network using a Matlab Neural Network Toolbox, particularly using the command nntool. The detection is basically for traffic sign and I have used a database of 90 traffic images(no-entry,no right and stop signs), each of 30 images of size 8*8 pixels of which no-entry signs are taken positive.... | 0 | 2016-08-19T06:17:03Z | 39,035,758 | <p>First you need to take the weights of your neural network.
An example:</p>
<pre><code>[x,t] = simplefit_dataset;
net = feedforwardnet(20);
net = train(net,x,t);
wb = getwb(net)
</code></pre>
<p>Then I also suggest that you read on <a href="http://neuralnetworksanddeeplearning.com/chap1.html" rel="nofollow">ANN str... | 1 | 2016-08-19T09:36:12Z | [
"python",
"matlab",
"image-processing",
"neural-network"
] |
Finding the corresponding value in python | 39,032,311 | <p>I want to find the name of the car which has maximum mpg. I want to print 'Toyota' which has maximum mpg. I want to do this in a Pythonic way. I don't like to use pandas.</p>
<p>Here is my code:</p>
<pre><code>dataset=[]
f= open('auto-mpg-data.csv')
csv_f=csv.reader(f)
for row in csv_f:
dataset.append(row)
... | -1 | 2016-08-19T06:20:29Z | 39,032,410 | <p>You mentioned that you don't like <code>pandas</code>, but, for completeness sake, here is how you could have used <a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.read_csv.html" rel="nofollow"><code>pandas.read_csv()</code></a> to read the CSV file into a <em>dataframe</em> (which is quite <em>... | 0 | 2016-08-19T06:27:26Z | [
"python",
"python-3.x",
"csv"
] |
Finding the corresponding value in python | 39,032,311 | <p>I want to find the name of the car which has maximum mpg. I want to print 'Toyota' which has maximum mpg. I want to do this in a Pythonic way. I don't like to use pandas.</p>
<p>Here is my code:</p>
<pre><code>dataset=[]
f= open('auto-mpg-data.csv')
csv_f=csv.reader(f)
for row in csv_f:
dataset.append(row)
... | -1 | 2016-08-19T06:20:29Z | 39,033,002 | <p>Here are a couple of ways to improve your code:</p>
<ol>
<li>When you are working with files, it's always best to <a href="https://docs.python.org/3/tutorial/inputoutput.html#methods-of-file-objects" rel="nofollow"><code>close()</code></a> your file after working with it, or wrap your snippet of code in a <a href="... | 0 | 2016-08-19T07:05:59Z | [
"python",
"python-3.x",
"csv"
] |
Finding the corresponding value in python | 39,032,311 | <p>I want to find the name of the car which has maximum mpg. I want to print 'Toyota' which has maximum mpg. I want to do this in a Pythonic way. I don't like to use pandas.</p>
<p>Here is my code:</p>
<pre><code>dataset=[]
f= open('auto-mpg-data.csv')
csv_f=csv.reader(f)
for row in csv_f:
dataset.append(row)
... | -1 | 2016-08-19T06:20:29Z | 39,033,415 | <p>First, every object that supports iteration, can be converted directly to a list using the <code>list</code> function. Hence instead of</p>
<pre><code>for row in csv_f:
dataset.append(row)
</code></pre>
<p>you can do:</p>
<pre><code>dataset = list(csv_f)
</code></pre>
<p>Next, since <code>dataset</code> is a... | 0 | 2016-08-19T07:29:31Z | [
"python",
"python-3.x",
"csv"
] |
Finding the corresponding value in python | 39,032,311 | <p>I want to find the name of the car which has maximum mpg. I want to print 'Toyota' which has maximum mpg. I want to do this in a Pythonic way. I don't like to use pandas.</p>
<p>Here is my code:</p>
<pre><code>dataset=[]
f= open('auto-mpg-data.csv')
csv_f=csv.reader(f)
for row in csv_f:
dataset.append(row)
... | -1 | 2016-08-19T06:20:29Z | 39,033,651 | <p>The simplies way:</p>
<pre><code>with open('auto-mpg-data.csv') as fo:
reader = csv.reader(fo)
next(reader) # skip the header
biggest_row = max(reader, key=lambda row: float(row[0]))
print(biggest_row[3]) # or whatever the index is
</code></pre>
<p>Note that if your csv contains an incorrect data then ... | 0 | 2016-08-19T07:43:20Z | [
"python",
"python-3.x",
"csv"
] |
Finding the corresponding value in python | 39,032,311 | <p>I want to find the name of the car which has maximum mpg. I want to print 'Toyota' which has maximum mpg. I want to do this in a Pythonic way. I don't like to use pandas.</p>
<p>Here is my code:</p>
<pre><code>dataset=[]
f= open('auto-mpg-data.csv')
csv_f=csv.reader(f)
for row in csv_f:
dataset.append(row)
... | -1 | 2016-08-19T06:20:29Z | 39,034,936 | <p>Using for loop iterator...</p>
<pre><code>>>> mpg = [12,34,40.5,6]
>>> idx,maxMpg = 0,0
>>> for n,v in enumerate(mpg):
... if v>maxMpg: idx,maxMpg = n,v
...
>>> idx
2
>>> maxMpg
40.5
>>> carnames = ['ford','bmw','toyota','bugatti']
>>> carnames[idx]... | 0 | 2016-08-19T08:56:10Z | [
"python",
"python-3.x",
"csv"
] |
Python High Pass Filter | 39,032,325 | <p>I implemented an high pass filter in python using this code:</p>
<pre><code>from scipy.signal import butter, filtfilt
import numpy as np
def butter_highpass(cutoff, fs, order=5):
nyq = 0.5 * fs
normal_cutoff = cutoff / nyq
b, a = butter(order, normal_cutoff, btype='high', analog=False)
return b, a
... | 1 | 2016-08-19T06:21:30Z | 39,032,946 | <p>I hope this can help you:</p>
<pre><code>import numpy as np
import pandas as pd
from scipy import signal
import matplotlib.pyplot as plt
def sine_generator(fs, sinefreq, duration):
T = duration
nsamples = fs * T
w = 2. * np.pi * sinefreq
t_sine = np.linspace(0, T, nsamples, endpoint=False)
y_sin... | 1 | 2016-08-19T07:02:50Z | [
"python",
"signal-processing"
] |
Python High Pass Filter | 39,032,325 | <p>I implemented an high pass filter in python using this code:</p>
<pre><code>from scipy.signal import butter, filtfilt
import numpy as np
def butter_highpass(cutoff, fs, order=5):
nyq = 0.5 * fs
normal_cutoff = cutoff / nyq
b, a = butter(order, normal_cutoff, btype='high', analog=False)
return b, a
... | 1 | 2016-08-19T06:21:30Z | 39,083,588 | <p>Since my reputation is low I am unable to comment on your question - "What is the relationship between cutoff and filter order?" This is not an answer to your original question.</p>
<p>For an FIR filter, for a given cutoff frequency, the slope of the impulse response plot (|H(f)| vs f) is steeper for a higher order... | 0 | 2016-08-22T15:37:56Z | [
"python",
"signal-processing"
] |
Flashing multiple images in python | 39,032,376 | <p>I am new to python and I am working on flashing (displaying) like 516 images in a go. There have been many questions like this before but none helped me.
Here is the code </p>
<pre><code>import cv2
import matplotlib
import matplotlib.pyplot as plt
import matplotlib.image as mpimg
for i in range(1,516,1):
#a=cv... | -1 | 2016-08-19T06:24:57Z | 39,032,994 | <p>Your file path to <code>imread</code> is very likely invalid, so you do not get a proper image in <code>abb</code>, which then of course cannot be displayed, so you get the error about the image size.</p>
| 0 | 2016-08-19T07:05:32Z | [
"python",
"opencv",
"matplotlib"
] |
Flashing multiple images in python | 39,032,376 | <p>I am new to python and I am working on flashing (displaying) like 516 images in a go. There have been many questions like this before but none helped me.
Here is the code </p>
<pre><code>import cv2
import matplotlib
import matplotlib.pyplot as plt
import matplotlib.image as mpimg
for i in range(1,516,1):
#a=cv... | -1 | 2016-08-19T06:24:57Z | 39,035,688 | <p>You can use python os module to navigate through directory ,
and you do not need plotting to flash image .</p>
<pre><code>import cv2
import os # import os module
path = r"G:\TRAINING\1"
img_names = os.listdir(path) # return all image names in given path
for name in img_names:
im = cv2.imread( os.path.... | 0 | 2016-08-19T09:32:39Z | [
"python",
"opencv",
"matplotlib"
] |
Encoding issue with ASCII-safe file with codec header, depending on line count | 39,032,416 | <p>Here is magical bug of Python 3.5.2 on Windows that killed my day. File below fails on this system:</p>
<blockquote>
<pre><code>C:\Python35\python.exe encoding-problem-cp1252.py
File "encoding-problem-cp1252.py", line 2
SyntaxError: encoding problem: cp1252
</code></pre>
</blockquote>
<p>Contains almost nothing -... | 3 | 2016-08-19T06:27:40Z | 39,033,975 | <p>This looks like a regression caused by <a href="http://bugs.python.org/issue20731" rel="nofollow">issue #20731</a>. It looks like the position calculation is assuming there will always be CRLF line endings while your file has only got LF characters, leading to an incorrect offset <a href="https://hg.python.org/cpyth... | 3 | 2016-08-19T08:01:23Z | [
"python",
"windows",
"python-3.x",
"encoding",
"python-3.5"
] |
Update Cassandra Json Value with python Script | 39,032,691 | <p>Hi I am quite new to python. I do have following column in my Cassandra table. I need to update a certain value(set displayable to <strong>true</strong>) in it. How do i do this via python script?</p>
<pre><code>{
"rowId": "SYSTEM",
"status": null,
"startDate": null,
"endDate": null,
"creationDate": 14570... | 0 | 2016-08-19T06:46:29Z | 39,033,801 | <p>Based on the screenshot you shared, it looks like the <code>value</code> field is simply a <code>text</code> field (if that's not the case you must share the schema of the table), so you'll have to update the complete value stored in that field.</p>
| 0 | 2016-08-19T07:51:43Z | [
"python",
"cassandra"
] |
Formatting Lists into columns of a table output (python 3) | 39,032,720 | <p>I have data that is collected in a loop and stored under separate lists that hold only the same datatypes (e.g. only strings, only floats) as shown below:</p>
<pre><code>names = ['bar', 'chocolate', 'chips']
weights = [0.05, 0.1, 0.25]
costs = [2.0, 5.0, 3.0]
unit_costs = [40.0, 50.0, 12.0]
</code></pre>
<p>I have... | 3 | 2016-08-19T06:47:57Z | 39,032,993 | <p>Here is a small implementation that does what you want in basic python (no special modules). </p>
<pre><code>
names = ['bar', 'chocolate', 'chips']
weights = [0.05, 0.1, 0.25]
costs = [2.0, 5.0, 3.0]
unit_costs = [40.0, 50.0, 12.0]
titles = ['names', 'weights', 'costs', 'unit_costs']
data = [titles] + list(zip(na... | 0 | 2016-08-19T07:05:25Z | [
"python",
"list",
"formatting",
"columnsorting"
] |
Formatting Lists into columns of a table output (python 3) | 39,032,720 | <p>I have data that is collected in a loop and stored under separate lists that hold only the same datatypes (e.g. only strings, only floats) as shown below:</p>
<pre><code>names = ['bar', 'chocolate', 'chips']
weights = [0.05, 0.1, 0.25]
costs = [2.0, 5.0, 3.0]
unit_costs = [40.0, 50.0, 12.0]
</code></pre>
<p>I have... | 3 | 2016-08-19T06:47:57Z | 39,033,135 | <p>After visiting docs.python.org/3/library/functions.html#zip (link provided by cdarke) </p>
<p>I managed to find the solution I needed: </p>
<p>using the zip method I created a new summary list of the associated data:</p>
<pre><code># sort into rows of associated data and convert to list
rows = zip(names, weight... | 0 | 2016-08-19T07:13:47Z | [
"python",
"list",
"formatting",
"columnsorting"
] |
Formatting Lists into columns of a table output (python 3) | 39,032,720 | <p>I have data that is collected in a loop and stored under separate lists that hold only the same datatypes (e.g. only strings, only floats) as shown below:</p>
<pre><code>names = ['bar', 'chocolate', 'chips']
weights = [0.05, 0.1, 0.25]
costs = [2.0, 5.0, 3.0]
unit_costs = [40.0, 50.0, 12.0]
</code></pre>
<p>I have... | 3 | 2016-08-19T06:47:57Z | 39,033,695 | <p>Some interesting table draw with <code>texttable</code>.</p>
<pre><code>import texttable as tt
tab = tt.Texttable()
headings = ['Names','Weights','Costs','Unit_Costs']
tab.header(headings)
names = ['bar', 'chocolate', 'chips']
weights = [0.05, 0.1, 0.25]
costs = [2.0, 5.0, 3.0]
unit_costs = [40.0, 50.0, 12.0]
for ... | 1 | 2016-08-19T07:46:06Z | [
"python",
"list",
"formatting",
"columnsorting"
] |
Pyramid debug toolbar serving static content over HTTP instead of HTTPS | 39,033,106 | <p>On our test servers, we're using the <a href="http://docs.pylonsproject.org/projects/pyramid_debugtoolbar/en/latest/" rel="nofollow">Pyramid debug toolbar</a>, however, it generates <code>http://</code> links to static content (like its CSS and JavaScript files), while the rest of the content is served over HTTPS. T... | 2 | 2016-08-19T07:12:53Z | 39,034,219 | <p>There might be better/simpler ways to achieve this, but one thing you can do to achieve this add the <code>_scheme='https'</code> parameter to each call to <code>request.static_url()</code>.</p>
<p>For that you can of course edit <code>pyramid/url.py</code>, but you can also do this in your projects' <code>__init__... | 2 | 2016-08-19T08:15:26Z | [
"python",
"python-3.x",
"pyramid",
"pylons",
"pyramid-debug-toolbar"
] |
Pyramid debug toolbar serving static content over HTTP instead of HTTPS | 39,033,106 | <p>On our test servers, we're using the <a href="http://docs.pylonsproject.org/projects/pyramid_debugtoolbar/en/latest/" rel="nofollow">Pyramid debug toolbar</a>, however, it generates <code>http://</code> links to static content (like its CSS and JavaScript files), while the rest of the content is served over HTTPS. T... | 2 | 2016-08-19T07:12:53Z | 39,072,118 | <p>Usually you signal your web server to use HTTPS instead of HTTP by passing through <code>X-Forwarded-Proto</code> HTTP header.</p>
<p>Example from Nginx:</p>
<pre><code> proxy_set_header X-Forwarded-Proto $scheme;
</code></pre>
<p>However, this is not standard and may depend on your web server configuration. H... | 0 | 2016-08-22T05:49:15Z | [
"python",
"python-3.x",
"pyramid",
"pylons",
"pyramid-debug-toolbar"
] |
Cython's prange not improving performance | 39,033,170 | <p>I'm trying to improve the performance of some metric computations with Cython's <code>prange</code>. Here are my codes:</p>
<pre><code>def shausdorff(float64_t[:,::1] XA not None, float64_t[:,:,::1] XB not None):
cdef:
Py_ssize_t i
Py_ssize_t n = XB.shape[2]
float64_t[::1] hdist = np.ze... | 8 | 2016-08-19T07:15:34Z | 39,178,995 | <p>I think this the parallelization is working, but the extra overhead of the parallelization is eating up the time it would have saved. If I try with different sized arrays then I do begin to see a speed up in the parallel version</p>
<pre><code>XA = np.random.random((900, 2100))
XB = np.random.random((100, 2100, 90)... | 3 | 2016-08-27T08:19:20Z | [
"python",
"numpy",
"openmp",
"cython",
"gil"
] |
Pygame - Pygame keeps drawing more sprites after moving them | 39,033,505 | <p><a href="http://i.stack.imgur.com/Y6qT0.png" rel="nofollow">no idea what's wrong</a></p>
<p>won't let me post the full code, searched this website and google, but found no answers...</p>
<pre><code>DISPLAYSURF=pygame.display.set_mode((width,height),0,32)
sprite=pygame.image.load('generic_legionnary.png'
def move... | 0 | 2016-08-19T07:34:31Z | 39,034,694 | <p>Do you clear your screen at the start of each loop ?</p>
<p>Why are you loading new sprites each time you move ?</p>
<p>Who need only the one loaded before the function, not the others.</p>
<p>If you don't clear your screen in each loop, you get this trace.
(or your trace might be the old sprites that you have ov... | 0 | 2016-08-19T08:42:06Z | [
"python",
"pygame"
] |
How to remove duplicates of huge lists of objects in Python | 39,033,565 | <p>I have gigantic lists of objects with many duplicates (I'm talking thousands of lists with thousands of objects each, taking up to about 10million individual objects (already without duplicates).</p>
<p>I need to go through them and remove all the duplicates inside each list (no need to compare between lists, only ... | 1 | 2016-08-19T07:38:22Z | 39,033,758 | <p>I'd suggest to have a sorted list (if possible), so you can be more precise when you want compare items (like a dictionnary I mean). A hash (or not) list can fulfill that thing.</p>
<p>If you have the ability to manage the "add and delete" from your lists, it's better ! Sort the new items each time you add/delete. ... | 1 | 2016-08-19T07:49:07Z | [
"python",
"python-3.x"
] |
How to remove duplicates of huge lists of objects in Python | 39,033,565 | <p>I have gigantic lists of objects with many duplicates (I'm talking thousands of lists with thousands of objects each, taking up to about 10million individual objects (already without duplicates).</p>
<p>I need to go through them and remove all the duplicates inside each list (no need to compare between lists, only ... | 1 | 2016-08-19T07:38:22Z | 39,034,026 | <p>A fast, not order preserving solution for (hashable items) is</p>
<pre><code>def unify(seq):
# Not order preserving
return list(set(seq))
</code></pre>
<p><strong>Complete Edit</strong></p>
<p>I assume, that you have <code>dicts</code> inside a <code>list</code>. And you have many lists. The solution to r... | 0 | 2016-08-19T08:04:24Z | [
"python",
"python-3.x"
] |
Bs4 select_one vs find | 39,033,612 | <p>I was wondering what is the difference between performing <code>bs.find('div')</code> and <code>bs.select_one('div')</code>. Same goes for <code>find_all</code> and <code>select</code>. </p>
<p>Is there any difference performance wise, or if any is better to use over the other in specific cases.</p>
| 2 | 2016-08-19T07:40:56Z | 39,033,728 | <p><code>select()</code> and <code>select_one()</code> give you a different way navigating through an HTML tree using the <a href="https://www.crummy.com/software/BeautifulSoup/bs4/doc/#css-selectors" rel="nofollow">CSS selectors</a> which has rich and convenient syntax. Though, the CSS selector syntax support in <code... | 2 | 2016-08-19T07:47:28Z | [
"python",
"beautifulsoup",
"html-parsing",
"bs4"
] |
Bs4 select_one vs find | 39,033,612 | <p>I was wondering what is the difference between performing <code>bs.find('div')</code> and <code>bs.select_one('div')</code>. Same goes for <code>find_all</code> and <code>select</code>. </p>
<p>Is there any difference performance wise, or if any is better to use over the other in specific cases.</p>
| 2 | 2016-08-19T07:40:56Z | 39,036,044 | <p>select_one is normally much faster than find:</p>
<pre><code>In [13]: req = requests.get("https://httpbin.org/")
In [14]: soup = BeautifulSoup(req.content, "html.parser")
In [15]: soup.select_one("#DESCRIPTION")
Out[15]: <h2 id="DESCRIPTION">DESCRIPTION</h2>
In [16]: soup.find("h2", id="DESCRIPTIO... | 1 | 2016-08-19T09:54:03Z | [
"python",
"beautifulsoup",
"html-parsing",
"bs4"
] |
How can I view python library functions in VScode | 39,033,652 | <p>I can use <kbd>Ctrl</kbd>+left-click in the name of function to view library functions in PyCharm, and I want to do the same in VScode; what should I do?</p>
<p>I may not be very clear, so I recorded a gif.</p>
<p><a href="http://i.stack.imgur.com/xBAUK.gif" rel="nofollow"><img src="http://i.stack.imgur.com/xBAUK.... | 0 | 2016-08-19T07:43:26Z | 39,037,438 | <p>@cnkl, what you're after is the 'go to definition' feature.
You can go to the definition of a symbol by pressing F12.
If you press Ctrl and hover over a symbol, a preview of the declaration will appear</p>
<p>You can find more details here:
<a href="https://code.visualstudio.com/docs/editor/editingevolved#_go-to-... | 0 | 2016-08-19T11:03:38Z | [
"python",
"vscode"
] |
Are Jupyter notebook executors distributed dynamically in Apache Spark? | 39,033,661 | <p>I got a question in order to better understand a big data concept within Apache Hadoop Spark. Not sure if it's off-topic in this forum, but let me know.</p>
<p>Imagine a Apache Hadoop cluster with 8 servers managed by the Yarn resource manager. I uploaded a file into HDFS (file system) that is configured with 64MB ... | 1 | 2016-08-19T07:44:05Z | 39,034,110 | <blockquote>
<p>Are Jupyter notebook executors distributed dynamically in Apache Spark</p>
</blockquote>
<p>For the sake of clarity, let's distinguish</p>
<ul>
<li><p>Jupyter notebooks and their associated kernels - a kernel is the Python process behind a notebook's UI. A kernel executes whatever code you type and ... | 3 | 2016-08-19T08:08:48Z | [
"python",
"apache-spark",
"pyspark",
"jupyter",
"jupyter-notebook"
] |
Plot confusion matrix sklearn with multiple labels | 39,033,880 | <p>I am plotting a confusion matrix for a multiple labelled data, where labels look like: </p>
<blockquote>
<p>label1: 1, 0, 0, 0</p>
<p>label2: 0, 1, 0, 0</p>
<p>label3: 0, 0, 1, 0</p>
<p>label4: 0, 0, 0, 1</p>
</blockquote>
<p>I am able to classify successfully using the below code. <strong>I only ... | 2 | 2016-08-19T07:56:40Z | 39,034,386 | <p>I see this is still an open issue in <code>sklearn</code>'s repository:</p>
<p><a href="https://github.com/scikit-learn/scikit-learn/issues/3452" rel="nofollow">https://github.com/scikit-learn/scikit-learn/issues/3452</a></p>
<p>However there have been some attempts at implementing it. From the same #3452 thread i... | 0 | 2016-08-19T08:24:25Z | [
"python",
"machine-learning",
"scikit-learn",
"confusion-matrix"
] |
Minimize delay between two sounds played using winsound.PlaySound | 39,033,922 | <pre><code>winsound.PlaySound('1.wav', winsound.SND_FILENAME)
time.sleep(0.15)
winsound.PlaySound('1.wav', winsound.SND_FILENAME)
</code></pre>
<p><code>1.wav</code> is a sound file of length 01s</p>
<p>There is delay of more then a second between the two <code>winsound.PlaySound</code> calls, even if <code>time.slee... | 1 | 2016-08-19T07:58:42Z | 39,044,558 | <p>The winsound module seems to be unloved. It hasn't adapted to the Python 3 distinction between bytes and strings (<a href="http://bugs.python.org/issue11620" rel="nofollow">http://bugs.python.org/issue11620</a>), so it can't play a .wav file that is stored in memory. </p>
<p>You should probably move to a different ... | 1 | 2016-08-19T17:15:42Z | [
"python"
] |
Python : Argument based Singleton | 39,033,946 | <p>I'm following this <a href="http://stackoverflow.com/a/6798042/820410">link</a> and trying to make a singleton class. But, taking arguments (passed while initiating a class) into account so that the same object is returned if the arguments are same.</p>
<p>So, instead of storing class name/class reference as a <cod... | 2 | 2016-08-19T07:59:42Z | 39,038,020 | <p>As theheadofabroom and me already mentioned in the comments, there are some odds when relying on non-hashable values for instance caching or memoization. Therefore, if you still want to do exactly that, the following example does not hide the memoization in the <code>__new__</code> or <code>__init__</code> method. (... | 0 | 2016-08-19T11:33:02Z | [
"python",
"dictionary",
"arguments",
"singleton",
"hashable"
] |
Python: Date Conversion Error | 39,033,982 | <p>I'm trying to convert a string into a date format, to be later stored into an SQLite database. Below is the code line at which I'm getting an error.</p>
<pre><code>date_object = datetime.strptime(date, '%b %d, %Y %H:%M %Z')
</code></pre>
<p>And this is the error:</p>
<pre><code>File "00Basic.py", line 20, in spid... | 0 | 2016-08-19T08:01:39Z | 39,034,769 | <p>The problem is located in the <code>%Z</code> (Time zone) part of the format.
As the <a href="https://docs.python.org/2/library/datetime.html" rel="nofollow">documentation</a> explains</p>
<pre><code>%Z Time zone name (empty string if the object is naive). (empty), UTC, EST, CST
</code></pre>
<p>It looks like o... | 0 | 2016-08-19T08:47:16Z | [
"python",
"sqlite",
"date-conversion"
] |
Python: Date Conversion Error | 39,033,982 | <p>I'm trying to convert a string into a date format, to be later stored into an SQLite database. Below is the code line at which I'm getting an error.</p>
<pre><code>date_object = datetime.strptime(date, '%b %d, %Y %H:%M %Z')
</code></pre>
<p>And this is the error:</p>
<pre><code>File "00Basic.py", line 20, in spid... | 0 | 2016-08-19T08:01:39Z | 39,035,752 | <p>You could use <a href="https://pypi.python.org/pypi/pytz?" rel="nofollow"><code>pytz</code></a> for the timezone conversion as shown:</p>
<pre><code>from datetime import datetime
from pytz import timezone
s = "Aug 19, 2016 08:13 IST".replace('IST', '')
print(timezone('Asia/Calcutta').localize(datetime.strptime(s.r... | 0 | 2016-08-19T09:35:51Z | [
"python",
"sqlite",
"date-conversion"
] |
Python BeautifulSoup - Scraping Google Finance historical data | 39,033,999 | <p>I was trying to scrap Google Finance historical data. I was need of to total number of rows, which is located along with the pagination. The following is the div tag which is responsible for displaying the total number of rows:</p>
<pre><code><div class="tpsd">1 - 30 of 1634 rows</div>
</code></pre>
<p... | 1 | 2016-08-19T08:02:46Z | 39,034,299 | <p>You can just use the python module: <a href="https://pypi.python.org/pypi/googlefinance" rel="nofollow">https://pypi.python.org/pypi/googlefinance</a></p>
<p>The api is simple:</p>
<pre><code>#The google finance API that we need.
from googlefinance import getQuotes
#The json handeler, since the API returns a JSON.... | 0 | 2016-08-19T08:19:43Z | [
"javascript",
"python",
"beautifulsoup"
] |
Python BeautifulSoup - Scraping Google Finance historical data | 39,033,999 | <p>I was trying to scrap Google Finance historical data. I was need of to total number of rows, which is located along with the pagination. The following is the div tag which is responsible for displaying the total number of rows:</p>
<pre><code><div class="tpsd">1 - 30 of 1634 rows</div>
</code></pre>
<p... | 1 | 2016-08-19T08:02:46Z | 39,037,402 | <p>You can easily pass an offset i.e <em>start=..</em> to the url getting 30 rows at a time which is exactly what is happening with the pagination logic:</p>
<pre><code>from bs4 import BeautifulSoup
import requests
url = "https://www.google.com/finance/historical?cid=13564339&startdate=Jan+01%2C+2010&" \
... | 1 | 2016-08-19T11:01:01Z | [
"javascript",
"python",
"beautifulsoup"
] |
for in a parameter function python - zip dynamic | 39,034,136 | <p>I have dynamic <code>zip()</code> function call:</p>
<pre><code>zip(id, value[0], value[1], value[2], value[3], value[4])
</code></pre>
<p>Value has a dynamic length: it could contain 3 or 4 or 7 elements, etc.
Is there a way I can make the <code>zip()</code> function dynamic and work with a variable number of ele... | 1 | 2016-08-19T08:10:38Z | 39,034,229 | <p>Use the <code>*args</code> <em>call</em> syntax:</p>
<pre><code>zip(id, *value)
</code></pre>
<p>Prepending <code>value</code> with <code>*</code> tells Python to apply each entry in <code>value</code> as a separate argument to <code>zip()</code>.</p>
| 3 | 2016-08-19T08:16:08Z | [
"python",
"python-2.7",
"function"
] |
Dynamically add columns to Exsisting BigQuery table | 39,034,249 | <p><strong>Background</strong></p>
<p>I am loading files from local machine to BigQuery.Each file has variable number of fields.So,i am using <strong>'autodetect=true'</strong> while running load job.</p>
<p><strong>Issue</strong> is,when load job is run for first time and if the destination table doesn't exsist,Bigq... | 0 | 2016-08-19T08:17:12Z | 39,035,979 | <p>A naive solution would be:</p>
<p>1.get the target table schema using </p>
<p>service.tables().get(projectId=projectId, datasetId=datasetId, tableId=tableId)</p>
<p>2.Generate schema of your data in the file.</p>
<p>3.Compare the schemas (kind of a "diff") and then add those columns to the target table ,which ar... | 0 | 2016-08-19T09:50:09Z | [
"python",
"google-bigquery",
"google-cloud-platform"
] |
Dynamically add columns to Exsisting BigQuery table | 39,034,249 | <p><strong>Background</strong></p>
<p>I am loading files from local machine to BigQuery.Each file has variable number of fields.So,i am using <strong>'autodetect=true'</strong> while running load job.</p>
<p><strong>Issue</strong> is,when load job is run for first time and if the destination table doesn't exsist,Bigq... | 0 | 2016-08-19T08:17:12Z | 39,700,879 | <p>You should check schema update options. There is an option named as "ALLOW_FIELD_ADDITION" that will help you.</p>
| 1 | 2016-09-26T10:50:37Z | [
"python",
"google-bigquery",
"google-cloud-platform"
] |
cloudsql databases with django on 'new' flexible google app engine | 39,034,250 | <p>I'm building a django (1.9) app using cloudsql and a 'new' flexible environment. I have this same error:
<a href="http://stackoverflow.com/questions/20843817/django-on-google-appengine-with-cloudsql-how-to-connect-database-error-2002-c">Django on Google AppEngine with CloudSQL: How to connect database (Error 2002, C... | 0 | 2016-08-19T08:17:14Z | 39,045,983 | <p>I've made a PR for the documentation on github, but the key changes that were required in order for me to change my <code>DEBUG</code> flag from <code>True</code> to <code>False</code> are described below. </p>
<p>Be aware, that it seems once you change the <code>DEBUG</code> flag, GAE requires that your Cloud SQL ... | 0 | 2016-08-19T18:53:38Z | [
"python",
"django",
"google-app-engine",
"google-cloud-platform",
"google-cloud-sql"
] |
how to remove blank lines from a csv file created using python | 39,034,289 | <p>We are creating a subfile from a big csv file. The subfile contains only those rows which have their first column's value as D1:</p>
<pre><code>import csv
with open('input.csv', 'rb') as csvfile:
reader = csv.reader(csvfile, delimiter='|', quotechar='|')
writer1 = csv.writer(open('output.csv', 'w'), del... | 1 | 2016-08-19T08:19:13Z | 39,034,390 | <p>From python csv docs..</p>
<blockquote>
<pre><code>import csv
with open('eggs.csv', 'w', newline='') as csvfile:
spamwriter = csv.writer(csvfile, delimiter=' ',
quotechar='|', quoting=csv.QUOTE_MINIMAL)
spamwriter.writerow(['Spam'] * 5 + ['Baked Beans'])
spamwriter.writerow([... | 0 | 2016-08-19T08:24:38Z | [
"python",
"csv"
] |
how to remove blank lines from a csv file created using python | 39,034,289 | <p>We are creating a subfile from a big csv file. The subfile contains only those rows which have their first column's value as D1:</p>
<pre><code>import csv
with open('input.csv', 'rb') as csvfile:
reader = csv.reader(csvfile, delimiter='|', quotechar='|')
writer1 = csv.writer(open('output.csv', 'w'), del... | 1 | 2016-08-19T08:19:13Z | 39,416,946 | <p>This code runs fine:</p>
<pre><code>import csv
with open('input.csv', 'rb') as csvfile:
reader = csv.reader(csvfile, delimiter='|', quotechar='|')
writer1 = csv.writer(open('output.csv', 'wb'), delimiter = '|')
for row in reader:
a = row[0]
if (a=='D1'):
writer1.... | 0 | 2016-09-09T17:35:28Z | [
"python",
"csv"
] |
How to modify cells in a pandas DataFrame? | 39,034,351 | <p>I need to change individual elements in a DataFrame. I tried doing something like this, but it doesn't work:</p>
<pre><code>for index, row in df.iterrows():
if df.at[row, index] == 'something':
df.at[row, index] = df.at[row, index] + 'add a string'
else:
df.at[row, index] = df.at[row, index]... | 2 | 2016-08-19T08:22:35Z | 39,034,468 | <p>If need modify all columns in <code>DataFrame</code> use <a href="http://docs.scipy.org/doc/numpy-1.10.1/reference/generated/numpy.where.html" rel="nofollow"><code>numpy.where</code></a> with <a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.html" rel="nofollow"><code>DataFrame</code></... | 1 | 2016-08-19T08:29:08Z | [
"python",
"string",
"pandas",
"dataframe",
"condition"
] |
How to modify cells in a pandas DataFrame? | 39,034,351 | <p>I need to change individual elements in a DataFrame. I tried doing something like this, but it doesn't work:</p>
<pre><code>for index, row in df.iterrows():
if df.at[row, index] == 'something':
df.at[row, index] = df.at[row, index] + 'add a string'
else:
df.at[row, index] = df.at[row, index]... | 2 | 2016-08-19T08:22:35Z | 39,037,148 | <p>You can use <code>.ix</code> and apply a function like this:</p>
<pre><code>import pandas as pd
D = pd.DataFrame({'A': ['a', 'b', 3,7,'b','a'], 'B': ['a', 'b', 3,7,'b','a']})
D.ix[D.index%2 == 0,'A'] = D.ix[D.index%2 == 0,'A'].apply(lambda s: s+'x' if isinstance(s,str) else s+1)
D.ix[D.index[2:5],'B'] = D.ix[D.i... | 1 | 2016-08-19T10:48:38Z | [
"python",
"string",
"pandas",
"dataframe",
"condition"
] |
Risk to overwrite tables via Django Models migrations? | 39,034,499 | <p>I'm currently trying to update my Django models to incorporate some new functionality but after runnning "makemigrations", the console output makes me worried I'm going to overwrite other tables in the database. </p>
<p>Essentially, in my models.py, I have 8 models. One is entirely new, one is merely modified. I wa... | 0 | 2016-08-19T08:30:51Z | 39,034,579 | <p>Django doesn't interrogate the database itself when making migrations; it builds up a graph based on previous migrations and the current state of the models. So if there are no previous migrations Django will create them from scratch. This won't overwrite your tables, but it won't actually work either, as it will at... | 2 | 2016-08-19T08:35:47Z | [
"python",
"django",
"python-2.7",
"django-models",
"django-migrations"
] |
Python: "unexpected end of regular expression" during re.compile, empty brackets | 39,034,603 | <p>To summarize i have <code>re.compile</code> statement like so:</p>
<pre><code>markers = ['x'] # some list
re.compile(r" *[{}].*(?=\n|$)".format('\\'.join([''] + markers)))
</code></pre>
<p>For most cases it works fine <strong>unless <code>markers</code> is empty</strong> and RegEx pattern looks like so:</p>
<pre>... | 0 | 2016-08-19T08:37:34Z | 39,035,409 | <p>You may check if the markers list is not empty <em>at the very beginning</em>, then, only escape the characters that must be escaped in the character class: <code>^</code>, <code>\</code>, <code>]</code>, <code>[</code>, <code>-</code>.</p>
<p>Note that if the markers list is empty, the pattern becomes <code> *.*</... | 1 | 2016-08-19T09:18:48Z | [
"python",
"regex",
"python-2.7"
] |
Which exception should I throw if a module is not the correct version? | 39,034,635 | <p>This may have been asked before or I may be overly pedantic, but my own searches have come up empty.</p>
<p>Looking through the <a href="https://docs.python.org/2/library/exceptions.html" rel="nofollow">Python 2.x exceptions page</a>, I'm not sure which one I should <code>raise</code> if my script determines that t... | 0 | 2016-08-19T08:39:07Z | 39,034,724 | <p>You can create you own custom exception if the existing ones don't suffice.</p>
<pre><code>class VersionError(Exception):
def __init__(self, msg):
Exception.__init__(self,msg)
</code></pre>
| 2 | 2016-08-19T08:44:02Z | [
"python",
"exception",
"version"
] |
Which exception should I throw if a module is not the correct version? | 39,034,635 | <p>This may have been asked before or I may be overly pedantic, but my own searches have come up empty.</p>
<p>Looking through the <a href="https://docs.python.org/2/library/exceptions.html" rel="nofollow">Python 2.x exceptions page</a>, I'm not sure which one I should <code>raise</code> if my script determines that t... | 0 | 2016-08-19T08:39:07Z | 39,034,756 | <p>You've got a lot of options depending on what you want to do with this exception... Generally, I'd expect the install scripts to handle setting up the appropriate versions of dependencies so I might think of this as a simple runtime assertion -- Therefore <code>AssertionError</code> may be appropriate.</p>
<p>This ... | 2 | 2016-08-19T08:46:46Z | [
"python",
"exception",
"version"
] |
Changing Odoo 9 "login title" | 39,034,681 | <p>I was following this post <a href="http://stackoverflow.com/questions/26974431/odoo-8-how-to-change-page-title/29182681#29182681">Odoo 8 - how to change page title?</a> on how to change Odoo 9 login title . I believe I followed the steps and also restarted the server, but the title didn't change. Any suggestions?</p... | -2 | 2016-08-19T08:41:07Z | 39,038,555 | <p>So i figured found a way to do it.</p>
<p>1.Click the drop down menu on administrator(In the upper right corner).</p>
<p>2.Click the "about" link and activate developer mode.</p>
<p>3.Now go to settings,User interface,Views.Type "layout" in search bar.A set of layouts is brought.Click on Web layout.Click edit.In ... | 0 | 2016-08-19T11:58:15Z | [
"python",
"odoo-9"
] |
Unexpected behaviour when grouping outliers in pandas [Python] | 39,034,691 | <p>My dataframe is in this format </p>
<pre><code>df
Count
DateTime
2015-01-16 10
2015-01-17 28
2015-01-18 26
2015-01-19 10
2015-01-20 24
2015-01-21 25
</code></pre>
<p>Im experimenting with this function to eliminate outliers using groupby</p>
<pre><code>def replaceit(group):
mean, std = ... | 1 | 2016-08-19T08:42:03Z | 39,034,744 | <p>Problem is if use <code>df2 = df</code> it is reference to the initial DataFrame. Thus, changing <code>df2</code> will change the initial DataFrame <code>df</code>.</p>
<p>You need <a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.copy.html" rel="nofollow"><code>copy</code></a>:</p>
<... | 2 | 2016-08-19T08:45:44Z | [
"python",
"pandas",
"dataframe"
] |
Create a python class with a uniqure feature | 39,034,712 | <p>I have a bunch of interdependent variables that I want to save in a list of class elements. Now I want it to be sorted according to one of the class features. At the moment, what I am doing is this:</p>
<pre><code> class myclass(object):
lst_of_A=[]
def __init__(self, Attr_A, Attr_B, Attr_C):
... | 0 | 2016-08-19T08:43:13Z | 39,036,009 | <p>First point, you want to use a <code>dict</code> (or <code>OrderedDict</code> if insertion order matters) instead of a <code>list</code> - this makes for more readable and much faster code. </p>
<p>Second point, you want to encapsulate all the handling of this collection (specially the "create or extend" part) so t... | 0 | 2016-08-19T09:51:33Z | [
"python",
"list",
"class"
] |
add exceptions to python function | 39,034,718 | <p>I have a function that takes an integer as input and returns the number as words, it works as I want with the exception of <code>30,40,50,60,70,80</code> and <code>90</code>, it returns for <code>90 = ninty zero</code>, because the function works by splitting the number, how can I remove the zero being added for the... | 0 | 2016-08-19T08:43:39Z | 39,034,802 | <p>Just perform an extra pass to correct problems. Sometimes simpler than trying to figure out how to avoid them.</p>
<pre><code>print wordify(90).replace(" zero","")
</code></pre>
<p>or: rename your wordify function into <code>internal_wordify</code>, then define <code>wordify</code> like that:</p>
<pre><code>def w... | 0 | 2016-08-19T08:48:55Z | [
"python",
"python-2.7",
"function"
] |
add exceptions to python function | 39,034,718 | <p>I have a function that takes an integer as input and returns the number as words, it works as I want with the exception of <code>30,40,50,60,70,80</code> and <code>90</code>, it returns for <code>90 = ninty zero</code>, because the function works by splitting the number, how can I remove the zero being added for the... | 0 | 2016-08-19T08:43:39Z | 39,034,823 | <p>Changing the following line:</p>
<pre><code>if n % 100 == 0: return d[n]
</code></pre>
<p>to</p>
<pre><code>if n % 10 == 0: return d[n]
</code></pre>
<p>solves this issue. Since it will then always use the single word and not add the zero behind it whenever it's a multiple of 10.</p>
| 2 | 2016-08-19T08:50:02Z | [
"python",
"python-2.7",
"function"
] |
Heatmap for nonuniformly spaced data | 39,034,797 | <p>I want to create a heatmap using matplotlib like the one depicted below. The data is not uniformly spaced as you can see from the axes ticks.
So suppose we have</p>
<pre><code>x = [1, 1.5, 2, 2.5, 3, 3.5, 4, 5, 7]
y = [.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5]
vals = np.random.rand(len(x), len(y))
</code></pre>
<p>How ... | -1 | 2016-08-19T08:48:41Z | 39,035,053 | <p>you should interpolate missing data, I used in one of my project following:</p>
<pre><code>#create regular grid
xi, yi = np.linspace(x.min(), x.max(), 100), np.linspace(y.min(), y.max(), 100)
xi, yi = np.meshgrid(xi, yi)
#interpolate missing data
rbf = scipy.interpolate.Rbf(x, y, z, function='linear')
zi = rbf(xi,... | 0 | 2016-08-19T09:02:24Z | [
"python",
"matplotlib",
"plot",
"heatmap"
] |
Django signals for models value change condition? | 39,034,798 | <p>I have a very simple models in my models.py like this :</p>
<pre><code>class Music(models.Model):
title= models.CharField(
max_length=100
)
description = models.TextField(
null=True,
blank=True
)
def __unicode__(self):
return self.name
class Album(models.Model... | 0 | 2016-08-19T08:48:48Z | 39,036,405 | <p>So I you want to trigger your signal only when certain field is changed right?
You can use a package called <a href="https://github.com/grantmcconnaughey/django-field-history" rel="nofollow">Django Field history</a></p>
<p>Something like this:</p>
<pre><code>@receiver(post_save, sender=<sender>, dispatch_uid... | 0 | 2016-08-19T10:12:01Z | [
"python",
"django",
"signals"
] |
How to parallelize task in Flask? | 39,034,849 | <p>I'm sending a XHR request to my Flask server in order to do several pings on a network</p>
<h2>Resource</h2>
<pre><code>def get(self, site_id):
â¦
for printer in printers:
hostname = printer['hostname']
response[site_id][hostname] = network_utils.ping(hostname)
return response
</code>... | 1 | 2016-08-19T08:51:12Z | 39,037,917 | <p>Make the subprocess asynchronous via <a href="http://www.gevent.org/" rel="nofollow">gevent</a>, for example.</p>
<pre><code>from gevent import subprocess
import gevent
def ping(hostname):
command = ['ping', '-c', '1', '-W', '1', '-q', hostname]
return subprocess.Popen(command, stdout=subprocess.PIPE)
def... | 1 | 2016-08-19T11:27:27Z | [
"python",
"flask",
"parallel-processing",
"ping",
"flask-restful"
] |
How to parallelize task in Flask? | 39,034,849 | <p>I'm sending a XHR request to my Flask server in order to do several pings on a network</p>
<h2>Resource</h2>
<pre><code>def get(self, site_id):
â¦
for printer in printers:
hostname = printer['hostname']
response[site_id][hostname] = network_utils.ping(hostname)
return response
</code>... | 1 | 2016-08-19T08:51:12Z | 39,037,929 | <p>Sounds like the best choice is threading because your issue is <strong>I/O bound</strong>. I'm using <a href="https://docs.python.org/2/library/threading.html#semaphore-objects" rel="nofollow">Semaphore</a> to limit to 5 threads.</p>
<p>I'm sending the response dict to the ping dict are thread safe, but you should... | 2 | 2016-08-19T11:27:49Z | [
"python",
"flask",
"parallel-processing",
"ping",
"flask-restful"
] |
How to parallelize task in Flask? | 39,034,849 | <p>I'm sending a XHR request to my Flask server in order to do several pings on a network</p>
<h2>Resource</h2>
<pre><code>def get(self, site_id):
â¦
for printer in printers:
hostname = printer['hostname']
response[site_id][hostname] = network_utils.ping(hostname)
return response
</code>... | 1 | 2016-08-19T08:51:12Z | 39,052,548 | <p>Upvote <a href="http://stackoverflow.com/a/39037929/802365">Or Duan answer</a> as mine is based on his answer:</p>
<h3>Resource</h3>
<pre><code>class Ping(Resource):
def get(self, site_id):
site_hostname = mast_utils.list_sites(site_id)['results'][0]['hostname']
printers = mast_utils.list_print... | 0 | 2016-08-20T09:30:00Z | [
"python",
"flask",
"parallel-processing",
"ping",
"flask-restful"
] |
Python script not getting executed when put on crontab | 39,034,905 | <p>I have written a python script which is reading some logs and then writing the required info into a csv file.Its working fine if I execute it manually by python <code>myscript.py</code> .However when I m calling it through cron its not working.
I have tried:</p>
<pre><code>* * * * * python /path/to/myscript.py
* * ... | -3 | 2016-08-19T08:54:22Z | 39,035,132 | <p>Default shell for cron is not <code>/bin/bash</code>, so you need to give the full path to Python executable.<br>
Check the output of <code>which python</code>. On my machine it's <code>/usr/bin/python</code>.<br>
Assuming this, your cron job entry should be:</p>
<pre><code>* * * * * /usr/bin/python /path/to/myscri... | 0 | 2016-08-19T09:06:40Z | [
"python",
"shell",
"cron-task"
] |
Python script not getting executed when put on crontab | 39,034,905 | <p>I have written a python script which is reading some logs and then writing the required info into a csv file.Its working fine if I execute it manually by python <code>myscript.py</code> .However when I m calling it through cron its not working.
I have tried:</p>
<pre><code>* * * * * python /path/to/myscript.py
* * ... | -3 | 2016-08-19T08:54:22Z | 39,035,239 | <p>Make sure that you do not use any kind of relative paths inside your python script. This can cause your script to exit with an error. </p>
<p>So make sure that within your script you do not use <code>../to/something</code>, but instead <code>/path/to/something</code>.</p>
<p>ie</p>
<pre><code>with open('../file.t... | 0 | 2016-08-19T09:11:16Z | [
"python",
"shell",
"cron-task"
] |
How to print out elements of a class | 39,034,964 | <p>I just got started with python, now I need to print out the names of elements/objects/instances of a class, this is my code: </p>
<pre><code>class Delicious :
sweet = 0
sour = 0
apple = Delicious()
kiwi = Delicious()
litchi = Delicious()
bracket = [apple, kiwi, lichi]
print(bracket)
</code></pre>
<p>I ... | -1 | 2016-08-19T08:57:56Z | 39,035,216 | <p>The way to get this to work is by grabbing the instances name from <code>globals()</code> and returning it from <code>__str__</code>:</p>
<pre><code>class Delicious :
sweet = 0
sour = 0
def __str__(self):
for k, v in globals().items():
if v == self:
return k
de... | 2 | 2016-08-19T09:10:06Z | [
"python",
"python-3.x"
] |
Convert a list of Gene Symbols to UniProt accession numbers using Python | 39,035,103 | <p>I have a list of gene symbols which represent the intersection of two high throughput data sets. I'm interested in doing some sort of GO annotation and clustering, but in order to do this I need to convert these gene symbols into UniProt accession numbers. My question is, what is the best way to do this using Python... | 0 | 2016-08-19T09:05:12Z | 39,299,849 | <p>Get some mapping from gene name to PDB ID, like this JSON: <a href="http://www.rcsb.org/pdb/browse/homo_sapiens_download.jsp?rows=100000&page=1&sidx=id&sord=desc" rel="nofollow">http://www.rcsb.org/pdb/browse/homo_sapiens_download.jsp?rows=100000&page=1&sidx=id&sord=desc</a> saving it for exa... | 1 | 2016-09-02T19:55:30Z | [
"python",
"converter",
"biopython"
] |
Run Python program as service on Ubuntu 16.04 inside a virtual environment | 39,035,233 | <p>I'm trying to get a Flask + SocketIO app running as a service on Ubuntu 16.04, inside a virtual environment. My server is restarted every day at 3 am (outside of my control), so I need it to automatically launch on startup.</p>
<p>Running the script by itself works fine:</p>
<pre><code>$ python main.py
(29539) wsg... | 0 | 2016-08-19T09:11:06Z | 39,671,027 | <p>I believe that you mistype PYTHON_HOME and than PATH=$VIRTUAL_ENV/bin:$PATH</p>
<p>you should use PATH=$PYTHON_HOME/bin:$PATH</p>
| 0 | 2016-09-23T23:43:10Z | [
"python",
"ubuntu",
"flask",
"virtualenv",
"daemon"
] |
How can I get the number of groups to vary depending on the number of lines? | 39,035,234 | <p>I have this regex: <code>^:([^:]+):([^:]*)</code> which works as in <a href="https://regex101.com/r/qM5nR0/2" rel="nofollow">this regex101 link</a>.</p>
<p>Now, in Python, I have this:</p>
<pre><code>def get_data():
data = read_mt_file()
match_fields = re.compile('^:([^:]+):([^:]*)', re.MULTILINE)
fie... | 0 | 2016-08-19T09:11:06Z | 39,035,667 | <p>To do what you want, you'd need another regex.
This is as <code>re.match</code> only matches the last item it matches:</p>
<pre><code>>>> re.match(r'(\d)+', '12345').groups()
('5',)
</code></pre>
<p>Instead of using one regex you'll need to use two.
The one that you are using at the moment, and then one t... | 1 | 2016-08-19T09:30:49Z | [
"python",
"regex",
"python-3.x",
"split"
] |
How can I get the number of groups to vary depending on the number of lines? | 39,035,234 | <p>I have this regex: <code>^:([^:]+):([^:]*)</code> which works as in <a href="https://regex101.com/r/qM5nR0/2" rel="nofollow">this regex101 link</a>.</p>
<p>Now, in Python, I have this:</p>
<pre><code>def get_data():
data = read_mt_file()
match_fields = re.compile('^:([^:]+):([^:]*)', re.MULTILINE)
fie... | 0 | 2016-08-19T09:11:06Z | 39,043,680 | <p>You may use a simple trick: after getting the matches with your regex, run a <code>.+\n*</code> regex over the Group 2 value:</p>
<pre><code>import re
p = re.compile(r'^:([^:]+):([^:]+)', re.MULTILINE)
s = ":1:text\ntext\n\n:20:text\n\n:21:text\ntext\ntext\n\n:22: \n\n:25:aa\naa\naaaaa"
print([[x.group(1)] + re.fin... | 1 | 2016-08-19T16:20:37Z | [
"python",
"regex",
"python-3.x",
"split"
] |
Why do every virtual environment use(point) same python version in pyenv? | 39,035,288 | <p>I'm using <code>pyenv</code>, <code>virtualenv</code>, 'autoev` for setting my virtual environment.</p>
<p>I install <code>Python3.5.1</code>, <code>Python2.7.9</code> and create several project virtual environments.</p>
<p>But when I activate each environment and check python version by <code>which python</code>:... | 2 | 2016-08-19T09:13:23Z | 39,035,384 | <p>To change the <code>PYTHONPATH</code> used in a <code>virtualenv</code>, you will have to add this line to your virtualenv's <code>bin/activate</code> file:</p>
<p>`export PYTHONPATH="/correct_path/"</p>
<p><br>
So in your case it should be <code>export PYTHONPATH="/Users/Chois/.pyenv/versions/chacha_dabang/bin/py... | 0 | 2016-08-19T09:17:41Z | [
"python",
"virtualenv",
"pyenv"
] |
Why do every virtual environment use(point) same python version in pyenv? | 39,035,288 | <p>I'm using <code>pyenv</code>, <code>virtualenv</code>, 'autoev` for setting my virtual environment.</p>
<p>I install <code>Python3.5.1</code>, <code>Python2.7.9</code> and create several project virtual environments.</p>
<p>But when I activate each environment and check python version by <code>which python</code>:... | 2 | 2016-08-19T09:13:23Z | 39,061,621 | <p>No problem</p>
<p>When you try to run Python, it first looks for a <code>.python-version</code> in the current directory to decide which version of python to run. If it doesnât find this file, then it looks for the user-level file <code>~/.pyenv/version</code>.</p>
<p>You can use <code>python --version</code> in... | 1 | 2016-08-21T06:57:13Z | [
"python",
"virtualenv",
"pyenv"
] |
fast way to loop over whole python dictionary | 39,035,291 | <p>I have non-ordered data that sometimes I want to analyse by looking at all the entries and some other time I want to pick just one entry.</p>
<p><code>
p1 x1 x2 x3 x4
p2 x1 x2 x3 x4
p33 x1 x2 x3 x4
p3 x1 x2 x3 x4
p4 x1 x2 x3 x4
</code></p>
<p><code>Dictionary</code> seems a nice format to store the data, ... | 0 | 2016-08-19T09:13:33Z | 39,036,018 | <p>If its possible use numpy/pandas...</p>
<p>For me Python is only for High Level Programming and Low Level is C++... So if possible use existing c++ functions which are in numpy pandas or other libs..</p>
<p>Check it out...</p>
<pre><code>>>> import numpy as np, pandas as pd
>>> p1 = np.arange(10... | 0 | 2016-08-19T09:52:12Z | [
"python",
"performance",
"dictionary",
"bigdata"
] |
JoinableQueue join() method blocking main thread even after task_done() | 39,035,329 | <p>In below code, if I put <code>daemon = True</code> , consumer will quit before reading all queue entries. If consumer is non-daemon, Main thread is always blocked even after the <code>task_done()</code> for all the entries.</p>
<pre><code>from multiprocessing import Process, JoinableQueue
import time
def consume... | 0 | 2016-08-19T09:14:59Z | 39,060,824 | <p>Let's see whatâI believeâis happening here:</p>
<ol>
<li>both processes are being started.</li>
<li>the <code>consumer</code> process starts its loop and blocks until a value is received from the queue.</li>
<li>the <code>producer1</code> process feeds the queue 26 times with a letter while the main process fee... | 0 | 2016-08-21T04:24:31Z | [
"python",
"multiprocessing"
] |
python - Implementing Sobel operators with python without opencv | 39,035,510 | <p>Given a greyscale 8 bit image (2D array with values from 0 - 255 for pixel intensity), I want to implement the Sobel operators (mask) on an image. The Sobel function below basically loops around a given pixel,applies the following weight to the pixels:
<a href="http://i.stack.imgur.com/1N67K.png" rel="nofollow"><i... | 2 | 2016-08-19T09:24:08Z | 39,037,728 | <p>If using NumPy ans SciPy is not a problem, then a simple solution is to use the SciPy's <a href="http://docs.scipy.org/doc/scipy-0.15.1/reference/generated/scipy.signal.convolve2d.html" rel="nofollow"><code>convolve2d()</code></a>.</p>
<pre><code>import numpy as np
from scipy.signal import convolve2d
from scipy.ndi... | 0 | 2016-08-19T11:17:57Z | [
"python",
"image",
"vision",
"sobel"
] |
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