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 |
|---|---|---|---|---|---|---|---|---|---|
TypeError: not all arguments converted during string formatting postgres | 38,553,237 | <p>I try to add data to the database (use psycopg2.connect): </p>
<pre><code>cand = Candidate('test', datetime.now(), 'test@test.t', '123123', "21", 'test', 'test', 'test', datetime.now(), "1", "1", 'test', 'M', "18", "2", "2")
db.addCandidate(cand)
</code></pre>
<p>my function add:</p>
<pre><code>def addCandidate(s... | 0 | 2016-07-24T14:40:01Z | 38,554,448 | <p>I solved my problem, I wrote 15 '%s', instead of 16</p>
| 0 | 2016-07-24T16:52:24Z | [
"python",
"postgresql",
"psycopg2"
] |
Python numpy: Matrix multiplication giving wrong result | 38,553,238 | <p>I'm using matrices in numpy python. I have a matrix A and I then I calculate its inverse. Now I multiply A with its inverse, and I'm not getting the identity matrix. Can anyone point out what's wrong here?</p>
<pre><code>A = matrix([
[4, 3],
[3, 2]
]);
print (A.I) # prints [[-2 3], ... | 1 | 2016-07-24T14:40:04Z | 38,553,285 | <p>You are using dot on the matrix and the transposed matrix (not the inverse) ... </p>
<pre><code>In [16]: np.dot(A.I, A)
Out[16]:
matrix([[ 1., 0.],
[ 0., 1.]])
</code></pre>
<p>With the transposed you have the result you showed:</p>
<pre><code>In [17]: np.dot(A.T, A)
Out[17]:
matrix([[25, 18],
[... | 4 | 2016-07-24T14:45:11Z | [
"python",
"numpy",
"matrix"
] |
Python numpy: Matrix multiplication giving wrong result | 38,553,238 | <p>I'm using matrices in numpy python. I have a matrix A and I then I calculate its inverse. Now I multiply A with its inverse, and I'm not getting the identity matrix. Can anyone point out what's wrong here?</p>
<pre><code>A = matrix([
[4, 3],
[3, 2]
]);
print (A.I) # prints [[-2 3], ... | 1 | 2016-07-24T14:40:04Z | 38,553,771 | <p>Here is another method: </p>
<p><code>I</code> works only on <code>matrix</code></p>
<p>you can use <code>np.linalg.inv(x)</code> for <code>inverse</code></p>
<pre><code>In [11]: import numpy as np
In [12]: A = np.array([[4, 3], [3, 2]])
In [13]: B = np.linalg.inv(A)
In [14]: A.dot(B)
Out[14]:
array([[ 1., 0... | 1 | 2016-07-24T15:37:40Z | [
"python",
"numpy",
"matrix"
] |
how to scrape multipage website with python and export data into .csv file? | 38,553,317 | <p>I would like to scrape the following website using python and need to export scraped data into a CSV file:</p>
<p><a href="http://www.swisswine.ch/en/producer?search=&&" rel="nofollow">http://www.swisswine.ch/en/producer?search=&&</a></p>
<p>This website consist of 154 pages to relevant search. I n... | 0 | 2016-07-24T14:48:41Z | 38,553,355 | <p>You should put your HTML parsing code to <em>under the loop</em> as well. And you are not incrementing the <code>i</code> variable correctly (thanks @MattDMo):</p>
<pre><code>import csv
import requests
from bs4 import BeautifulSoup
i = 0
while i < 153:
url = ("http://www.swisswine.ch/en/producer?sea... | 1 | 2016-07-24T14:53:26Z | [
"python",
"csv",
"beautifulsoup"
] |
Import across modules in Google App Engine | 38,553,318 | <p>I have a Python Google App Engine project structured as follows:</p>
<pre><code>app/
handlers/
register_user.py
models/
user.py
</code></pre>
<p>The <code>user.py</code> file contains a class <code>User(ndb.Model)</code>.</p>
<p>I'm trying to access the <code>User</code> class from <code>r... | 0 | 2016-07-24T14:48:58Z | 38,554,298 | <p>The way I approached this was using <a href="https://cloud.google.com/appengine/docs/python/tools/using-libraries-python-27#installing_a_library" rel="nofollow">the GAE 3rd party lib vendoring technique</a>:</p>
<ul>
<li>created <code>appengine_config.py</code>:</li>
</ul>
<p>content:</p>
<pre><code>from google.a... | 0 | 2016-07-24T16:34:56Z | [
"python",
"google-app-engine",
"python-import",
"google-app-engine-python"
] |
Import across modules in Google App Engine | 38,553,318 | <p>I have a Python Google App Engine project structured as follows:</p>
<pre><code>app/
handlers/
register_user.py
models/
user.py
</code></pre>
<p>The <code>user.py</code> file contains a class <code>User(ndb.Model)</code>.</p>
<p>I'm trying to access the <code>User</code> class from <code>r... | 0 | 2016-07-24T14:48:58Z | 38,557,611 | <p>I think Dan is on the right track, however there is no need to vendor your own code. The vendoring system is to manage third-party dependencies with pip and should be totally unnecessary for your use case, and vendoring your own code would violate the conventions.</p>
<p>Based on what you've told us, you should be ... | 1 | 2016-07-24T22:50:20Z | [
"python",
"google-app-engine",
"python-import",
"google-app-engine-python"
] |
Python - Checking whether any of multiple conditions are true | 38,553,410 | <p>I am trying to modify a list in place to remove entries where the file extension does not match. I got this working by writing multiple 'or' conditions</p>
<pre><code>from os import listdir
image_extensions = ['jpg','.png']
files = listdir('/home')
files = [x for x in files if '.jpg' in x or '.png' in x]
print fi... | 0 | 2016-07-24T15:00:22Z | 38,553,427 | <p>This should do:</p>
<pre><code>files = [x for x in files if any(s in x for s in image_extensions)]
# |<-->|
</code></pre>
<p>Check if <em>any</em> of the extensions is contained in the file name <code>x</code></p>
| 3 | 2016-07-24T15:02:11Z | [
"python",
"list",
"list-comprehension",
"any"
] |
Python - Checking whether any of multiple conditions are true | 38,553,410 | <p>I am trying to modify a list in place to remove entries where the file extension does not match. I got this working by writing multiple 'or' conditions</p>
<pre><code>from os import listdir
image_extensions = ['jpg','.png']
files = listdir('/home')
files = [x for x in files if '.jpg' in x or '.png' in x]
print fi... | 0 | 2016-07-24T15:00:22Z | 38,554,541 | <p>Alternative solution to that:</p>
<pre><code>>>> filter(lambda f: filter(f.endswith, image_extensions), files)
</code></pre>
<p>Time profiling this expression compared to the previous answer, reveals that there is a bit of improvement on the previous one:</p>
<pre><code>>>> import timeit
>>... | 0 | 2016-07-24T17:02:57Z | [
"python",
"list",
"list-comprehension",
"any"
] |
How should i decode this data/these strings | 38,553,545 | <p>I am currently trying to work through an OLD python CTF challenge, the script of the server is provided, and the idea is to send the correct data to this server,</p>
<pre><code>#!/usr/bin/env python3
# from dis import dis
import socketserver
import types
class RequestHandler(socketserver.BaseRequestHandler):
... | 2 | 2016-07-24T15:13:55Z | 38,554,453 | <p>Start an interactive Python 3 session. If you use the plain python interpreter, type</p>
<pre><code>import types
help(types.CodeType)
</code></pre>
<p>If you're using IPython, you might instead write</p>
<pre><code>import types
types.CodeType?
</code></pre>
<p>You'll learn that <code>types.CodeType</code> is the... | 3 | 2016-07-24T16:52:45Z | [
"python",
"string",
"decompiling"
] |
How should i decode this data/these strings | 38,553,545 | <p>I am currently trying to work through an OLD python CTF challenge, the script of the server is provided, and the idea is to send the correct data to this server,</p>
<pre><code>#!/usr/bin/env python3
# from dis import dis
import socketserver
import types
class RequestHandler(socketserver.BaseRequestHandler):
... | 2 | 2016-07-24T15:13:55Z | 38,600,702 | <p>Riffing off of das-g's answer, this code works. Sorta. </p>
<pre><code>import uncompyle6
import types
code_obj = types.CodeType(
1, 0, 5, 32, 67, b'd\x01\x00d\x02\x00d\x03\x00d\x04\x00d\x05\x00d\x06\x00d\x05\x00d\x07'
b'\x00d\x08\x00d\x05\x00d\t\x00d\x08\x00d\n\x00d\x01\x00d\x07\x00d\x07'
b'... | 1 | 2016-07-26T22:11:01Z | [
"python",
"string",
"decompiling"
] |
Is O(1) complexity of len(...) guaranteed by some PEP for built-in sequence types? | 38,553,561 | <p>Many questions about cost of <code>len(...)</code> are answered but I haven't found any link to Python documentation.</p>
<p>Is it by standard (documented in some PEP) or just way how it's currently implemented in most Python implementations?</p>
| 3 | 2016-07-24T15:16:04Z | 38,553,638 | <p>Documentation about time complexity for certain built-in python objects is <a href="https://wiki.python.org/moin/TimeComplexity" rel="nofollow">here</a>.</p>
<p>The <code>len()</code> function in python just calls the <code>__len__</code> method in your class. So if you built a custom class</p>
<pre><code>class Sl... | 2 | 2016-07-24T15:24:10Z | [
"python"
] |
Unable to upgrade ovirt-3.6 to ovirt-4.0 in CentOS 6.8 | 38,553,604 | <p>Trying to upgrade using a command <code>yum update "ovirt-engine-setup*"</code> detailed link is <a href="http://www.ovirt.org/release/4.0.0/" rel="nofollow">here.</a></p>
<p><code>Error: Package: ovirt-engine-lib-4.0.1.1-1.el7.centos.noarch (ovirt-4.0)
Requires: python(abi) = 2.7
Installed: p... | 0 | 2016-07-24T15:21:02Z | 38,568,976 | <p>from Ovirt's website:</p>
<blockquote>
<p>oVirt 4.0 is intended for production use and is available for the
following platforms:</p>
<ul>
<li>Fedora 23 </li>
<li>Red Hat Enterprise Linux 7.2 or later</li>
<li>CentOS 7.2 or later</li>
<li>Scientific Linux 7.2 or later</li>
</ul>
</blockquote>
<... | 0 | 2016-07-25T13:23:44Z | [
"python",
"linux",
"python-2.7",
"centos",
"dependencies"
] |
Unable to upgrade ovirt-3.6 to ovirt-4.0 in CentOS 6.8 | 38,553,604 | <p>Trying to upgrade using a command <code>yum update "ovirt-engine-setup*"</code> detailed link is <a href="http://www.ovirt.org/release/4.0.0/" rel="nofollow">here.</a></p>
<p><code>Error: Package: ovirt-engine-lib-4.0.1.1-1.el7.centos.noarch (ovirt-4.0)
Requires: python(abi) = 2.7
Installed: p... | 0 | 2016-07-24T15:21:02Z | 39,077,321 | <p>please follow <a href="http://www.ovirt.org/documentation/migration-engine-3.6-to-4.0/" rel="nofollow">http://www.ovirt.org/documentation/migration-engine-3.6-to-4.0/</a> for upgrading from 3.6 el6 to 4.0 el7.</p>
<p>If you're on hosted engine also read <a href="https://www.ovirt.org/documentation/how-to/hosted-eng... | 0 | 2016-08-22T10:36:03Z | [
"python",
"linux",
"python-2.7",
"centos",
"dependencies"
] |
Convert string to json data | 38,553,610 | <p>I am converting string to json format as below</p>
<pre><code>data = """
S3F4
accept reply: true
"""
</code></pre>
<p>And json data is <code>[{"header":{"stream":3,"function":4,"reply":True}}]</code></p>
<p>I can use regex and search pattern <code>S3F4</code> and add to dict.</p>
<p>But is there any better way... | -1 | 2016-07-24T15:21:41Z | 38,553,730 | <p>Not sure about all the variations of the input string and what is the scope of characters <code>stream</code>, <code>function</code> and <code>reply</code> can have, but here is what you can start with:</p>
<pre><code>S(?P<stream>\d)F(?P<function>\d)\naccept reply: (?P<reply>\w+)
</code></pre>
<p... | 1 | 2016-07-24T15:33:41Z | [
"python",
"json",
"regex"
] |
How can I stop opencv from making calls to qDebug? | 38,553,902 | <p>I've just started using OpenCv 3.1 and have encountered the following annoying behavior. Whenever I make an initial call to <code>imshow</code> (actually <code>cv2.imshow</code>, since I'm using the Python interface), I get this output to my screen:</p>
<pre><code>init done
opengl support available
</code></pre>
<... | 1 | 2016-07-24T15:52:16Z | 38,553,931 | <p><code>qDebug</code> is a preprocessor-controlled, but it has its own special macro, <code>QT_NO_DEBUG_OUTPUT</code>. If you add that to your Release build defines, it will be removed.</p>
| 1 | 2016-07-24T15:55:11Z | [
"python",
"c++",
"opencv"
] |
python dictionary key error excel | 38,553,919 | <p>I'm sure I'm doing something rather silly, but I'm just not seeing it!</p>
<p>Here's the code I'm trying to run:</p>
<pre><code>import pandas as pd
geo_dic = pd.read_excel('cityzip.xlsx', index_col=0).to_dict()
print geo_dic[' Longitude']['601'][0]
</code></pre>
<p>cityzip.xlsx contains these rows (and many more... | 1 | 2016-07-24T15:54:05Z | 38,554,922 | <p><a href="http://i.stack.imgur.com/BsAEE.png" rel="nofollow"><img src="http://i.stack.imgur.com/BsAEE.png" alt="enter image description here"></a></p>
<p><a href="http://i.stack.imgur.com/1x93t.png" rel="nofollow"><img src="http://i.stack.imgur.com/1x93t.png" alt="enter image description here"></a></p>
<p>Just try ... | 0 | 2016-07-24T17:43:02Z | [
"python",
"pandas",
"geopy"
] |
How to recall a method without parameters using Threading getting AssertionError | 38,553,948 | <p>So I have some methods that compile and work on the main thread, but I wanted to run a collection of methods at a certain time in the future after they successful run. I looked into importing the threading, time, and datetime classes. The next_call_auto variable in Thread() is an integer that waits for ~3 hours wort... | -1 | 2016-07-24T15:57:36Z | 38,556,189 | <p>According to the <a href="https://docs.python.org/2/library/threading.html#threading.Thread" rel="nofollow">docs for the Threading class</a>, this call:</p>
<pre><code>Thread(next_call_auto, target=auto_follow_others_thread)
</code></pre>
<p>is the same as:</p>
<pre><code>Thread(group = next_call_auto, target = a... | 0 | 2016-07-24T19:59:36Z | [
"python",
"multithreading"
] |
Python numpy - Giving identity matrix with non-diognal elements non-zero | 38,553,967 | <p>I'm using python numpy for matrix operations. Calculation of identity matrix is giving unexpected results - Not getting the standard identity matrix.</p>
<pre><code>R0 = matrix([
[0.02187598, 0.98329681, -0.18068986],
[0.99856708, -0.01266115, 0.05199501],
[0.04883878, -0.18156839, -0.9821648]
]);
pr... | 0 | 2016-07-24T15:59:25Z | 38,554,118 | <p>The problem is that even though mathematically the result of dot(R, R.I) is equal to I, due to numerical errors in the floating point numbers, numpy returns something very close to I, but not exactly equal to it.</p>
<p>The values with e-17 are very close approximations of 0.</p>
<p>If you want to generate the exa... | 2 | 2016-07-24T16:16:20Z | [
"python",
"numpy",
"matrix",
"linear-algebra",
"mat"
] |
Adding certain elements of list | 38,553,983 | <p>I want to add elements in a list every ten elements. For example:</p>
<pre><code>a = [5, 31, 16, 31, 19, 5, 25, 34, 8, 13, 17, 17, 43, 9, 29, 41, 8, 24,
48, 1, 28, 20, 37, 40, 32, 35, 9, 36, 17, 46, 10, 30, 49, 28, 2, 3, 8,
11, 36, 20, 7, 24, 29, 15, 0, 4, 35, 11, 42, 7, 28, 40, 31, 45, 6, 45,
15, 27, 39, 6]
</cod... | 0 | 2016-07-24T16:00:48Z | 38,554,019 | <p>Use <code>map</code> on an iterator of the list:</p>
<pre><code>>>> it = iter(a)
>>> map(lambda *x: sum(x), *(it,)*10)
[187, 237, 300, 197, 174, 282]
</code></pre>
<p>Create an iterator for your list. Pass the items to <code>map</code> in 10s using the iterator and use <code>map</code> to return ... | 1 | 2016-07-24T16:04:59Z | [
"python",
"list",
"sum"
] |
Adding certain elements of list | 38,553,983 | <p>I want to add elements in a list every ten elements. For example:</p>
<pre><code>a = [5, 31, 16, 31, 19, 5, 25, 34, 8, 13, 17, 17, 43, 9, 29, 41, 8, 24,
48, 1, 28, 20, 37, 40, 32, 35, 9, 36, 17, 46, 10, 30, 49, 28, 2, 3, 8,
11, 36, 20, 7, 24, 29, 15, 0, 4, 35, 11, 42, 7, 28, 40, 31, 45, 6, 45,
15, 27, 39, 6]
</cod... | 0 | 2016-07-24T16:00:48Z | 38,554,052 | <p>You can use nested comprehensions with a list iterator:</p>
<pre><code>i= iter(a)
s= [sum(next(i) for _ in range(10)) for _ in range(len(a)//10)]
print s
</code></pre>
<p>Note that this will silently ignore any leftover values:</p>
<pre><code>a= [1]*11 #<- list has 11 elements
i= iter(a)
s= [sum(next(i) for _ ... | 0 | 2016-07-24T16:08:18Z | [
"python",
"list",
"sum"
] |
Adding certain elements of list | 38,553,983 | <p>I want to add elements in a list every ten elements. For example:</p>
<pre><code>a = [5, 31, 16, 31, 19, 5, 25, 34, 8, 13, 17, 17, 43, 9, 29, 41, 8, 24,
48, 1, 28, 20, 37, 40, 32, 35, 9, 36, 17, 46, 10, 30, 49, 28, 2, 3, 8,
11, 36, 20, 7, 24, 29, 15, 0, 4, 35, 11, 42, 7, 28, 40, 31, 45, 6, 45,
15, 27, 39, 6]
</cod... | 0 | 2016-07-24T16:00:48Z | 38,554,054 | <pre><code>In [25]: map(sum, zip(*[iter(a)]*10))
Out[25]: [187, 237, 300, 197, 174, 282]
</code></pre>
| 2 | 2016-07-24T16:08:39Z | [
"python",
"list",
"sum"
] |
Adding certain elements of list | 38,553,983 | <p>I want to add elements in a list every ten elements. For example:</p>
<pre><code>a = [5, 31, 16, 31, 19, 5, 25, 34, 8, 13, 17, 17, 43, 9, 29, 41, 8, 24,
48, 1, 28, 20, 37, 40, 32, 35, 9, 36, 17, 46, 10, 30, 49, 28, 2, 3, 8,
11, 36, 20, 7, 24, 29, 15, 0, 4, 35, 11, 42, 7, 28, 40, 31, 45, 6, 45,
15, 27, 39, 6]
</cod... | 0 | 2016-07-24T16:00:48Z | 38,554,680 | <p>How about list comprehension, like this one:</p>
<pre><code>>>> step = 10
>>>
>>> [sum(a[x:x+step]) for x in range(0, len(a), step)]
[187, 237, 300, 197, 174, 282]
</code></pre>
| 0 | 2016-07-24T17:18:45Z | [
"python",
"list",
"sum"
] |
Seaborn - Logarithmic scaling of the "z axis" in a bivariate KDE plot? | 38,553,998 | <p>I am currently plotting some data using Seaborn's <code>JointPlot</code>:</p>
<pre><code>pitch = pd.Series(angles[:, 0], name="Pitch")
roll = pd.Series(angles[:, 1], name="Roll")
plot = sns.jointplot(pitch, roll, kind="kde", space=0.3)
</code></pre>
<p><a href="http://i.stack.imgur.com/h3Zww.png" rel="nofollow"><i... | 1 | 2016-07-24T16:02:58Z | 38,557,487 | <p>I guess you want to make log scale of y-axis for x auxiliary plot and make log scale of x-axis for y auxiliary plot? If I am right look at this example:</p>
<pre><code>import matplotlib.pylab as plt
import seaborn as sns
import numpy as np
iris = sns.load_dataset("iris")
plot = sns.jointplot("sepal_width", "petal_... | 0 | 2016-07-24T22:33:23Z | [
"python",
"matplotlib",
"seaborn"
] |
Installing modules in Python 3.5.2 error | 38,554,020 | <p>Sorry if I will sound really dumb but I get an error while trying to install python 3.5.2 modules using pip. The whole error screen is the following: </p>
<p><a href="http://i.stack.imgur.com/NZCgX.png" rel="nofollow"><img src="http://i.stack.imgur.com/NZCgX.png" alt="The error from the command line"></a></p>
<p>T... | 0 | 2016-07-24T16:05:04Z | 38,554,092 | <p>Do you have administrator privileges? Looks like you don't have privileges to access files</p>
| 1 | 2016-07-24T16:12:03Z | [
"python",
"pip"
] |
Python logging message not getting output as expected in simplest scenario | 38,554,040 | <p>I am not getting any output from <code>logging.debug</code> in the simplest possible situation. (I do get output from <code>logger.warn</code>.)</p>
<pre><code>import logging
logger = logging.getLogger()
logger.setLevel(logging.DEBUG)
logger.warn('Logger is warning')
logger.debug('Logger is debugging')
print(logger... | 0 | 2016-07-24T16:06:42Z | 38,563,489 | <p>The reason is that you haven't specified a handler. On Python 3.5, an internal <a href="https://docs.python.org/3.2/library/logging.html#logging.lastResort" rel="nofollow">"handler of last resort"</a> is used when no handler is specified by you, but that internal handler has a level of <code>WARNING</code> and so wo... | 0 | 2016-07-25T08:58:45Z | [
"python",
"logging"
] |
Can't select a row from a pandas dataframe, read from a csv | 38,554,122 | <p>I have a csv with some data that I'm reading into pandas:</p>
<pre><code>filename = sys.argv[1]
data = pd.read_csv(filename, sep=';', header=None)
xy = data
print str(xy)
</code></pre>
<p>Result:</p>
<pre><code> 0 1
0 label data
1 x ... | 0 | 2016-07-24T16:16:27Z | 38,555,522 | <p>Try this: </p>
<pre><code>filename = sys.argv[1]
df = pd.read_csv(filename, sep=';')
xy = df
</code></pre>
<p>Do not name your dataframe "data"; One of your column headers is named <code>data!</code>.
Then: for i, row in df.iterrows():
a = str(df['label'][i])
b = str(df['data'][i])
print (... | 1 | 2016-07-24T18:44:07Z | [
"python",
"csv",
"pandas",
"dataframe",
"row"
] |
Limiting execution time of embedded Python | 38,554,126 | <p>If I embed the Python interpreter in a C or C++ program, as in <a href="https://docs.python.org/2.7/extending/embedding.html#pure-embedding">this example</a>, is there any way to limit how long the interpreter runs for? Is there anything to stop the Python code from entering an infinite loop and thus preventing <cod... | 10 | 2016-07-24T16:16:49Z | 38,598,920 | <p>As you can see in <a href="https://docs.python.org/3/c-api/object.html#c.PyObject_CallObject">the docs</a>, <code>PyObject_CallObject</code> has no mechanism for limiting how long the function runs. There is also no Python C API function that I am aware of that allows you to pause or kill a thread used by the inter... | 6 | 2016-07-26T20:03:13Z | [
"python",
"infinite-loop",
"sandbox",
"python-embedding"
] |
Limiting execution time of embedded Python | 38,554,126 | <p>If I embed the Python interpreter in a C or C++ program, as in <a href="https://docs.python.org/2.7/extending/embedding.html#pure-embedding">this example</a>, is there any way to limit how long the interpreter runs for? Is there anything to stop the Python code from entering an infinite loop and thus preventing <cod... | 10 | 2016-07-24T16:16:49Z | 38,689,940 | <p>If You need control lag and jitter in some realtime system, embed "StacklessPython" - Python with support co-routines. Used in "Twisted Web Server".</p>
| 1 | 2016-08-01T01:42:45Z | [
"python",
"infinite-loop",
"sandbox",
"python-embedding"
] |
Scraping excel from website using python with _doPostBack link url hidden | 38,554,235 | <p>For last few days I am trying to scrap the following website (link pasted below) which has a few excels and pdfs available in a table. I am able to do it for the home page successfully. There are total 59 pages from which these excels/ pdfs have to be scrapped. In most of the websites I have seen till now there is a... | 1 | 2016-07-24T16:28:36Z | 38,557,881 | <p>For aspx sites, you need to look for things like <code>__EVENTTARGET</code>, <code>__EVENTVALIDATION</code> etc.. and post those parameters with each request, this will get all the pages and using <a href="http://docs.python-requests.org/en/master/" rel="nofollow">requests</a> with <em>bs4</em>:</p>
<pre><code>imp... | 0 | 2016-07-24T23:30:10Z | [
"python",
"web-scraping",
"dopostback"
] |
How do I plot observations each with multiple values in python? | 38,554,287 | <p>I have data for each individual participant from a survey. Each individual has a vector of data for example :</p>
<pre><code>#[a,b,c]
[1,2,5] # 1 participant
...
...
...
[1,3,4]
</code></pre>
<p>Instead of having that kind of data, I have the data column wise. Example :</p>
<pre><code>a = [1...1] # has n values e... | 1 | 2016-07-24T16:33:33Z | 38,554,334 | <p>Use each list as <code>xaxis</code>, <code>yaxis</code>, and <code>zaxis</code> data. This is especially useful when you know the lists are the same length, and each column represents one object. For example, <code>(a[0], b[0], c[0])</code> represent a trait of the same object. The <code>a-</code>, <code>b-</code> a... | 4 | 2016-07-24T16:38:40Z | [
"python",
"matplotlib",
"plot"
] |
How to return the original data frame with only the rows selected using value_counts() | 38,554,381 | <p>the original dataframe:</p>
<pre><code>from pandas import Series, DataFrame
import pandas as pd
%pylab inline
df=pd.read_csv('NYC_Restaurants.csv', dtype=unicode)
</code></pre>
<p><img src="http://i.stack.imgur.com/Be5Gg.png" alt="original df"></p>
<p>I used a mask to isolate the desired rows (those that occur o... | 0 | 2016-07-24T16:44:14Z | 38,557,643 | <p>Instead of using value_counts(); I used groupby which provided exactly what I was looking for.</p>
<pre><code>mask = df.groupby("DBA").filter(lambda x: len(x) == 1)
</code></pre>
| 0 | 2016-07-24T22:54:58Z | [
"python",
"pandas"
] |
Function appears to run faster each time it is called within a for loop | 38,554,495 | <p>I have written a very crude hill-climb/greedy algorithm for solving the travelling salesman problem. The aim was to use this as a benchmark and continually improve running time and optimise the solution at the same time. </p>
<p><strong>EDIT: On the suggestion of Stefan Pochmann, this appears to be related to hardw... | 0 | 2016-07-24T16:56:56Z | 38,562,303 | <p>This issue is related to OS/hardware allocation of resources to the CPU, not CPU branch prediction. On Windows 7, running another script concurrently that simply does:</p>
<pre><code>for x in range(10):
a = sum(xrange(10**8))
</code></pre>
<p>will cause massive acceleration in the execution of the script in th... | 1 | 2016-07-25T07:49:44Z | [
"python",
"algorithm"
] |
Beautfil Soup Error with simple script | 38,554,550 | <p>I am running Beautiful Soup 4.5 with Python 3.4 on Windows 7. Here is my script:</p>
<pre><code>from bs4 import BeautifulSoup
import urllib3
http = urllib3.PoolManager()
url = 'https://scholar.google.com'
response = http.request('GET', url)
html2 = response.read()
soup = BeautifulSoup([html2])
print (type(soup)... | -2 | 2016-07-24T17:04:06Z | 38,554,568 | <p>Not sure why are you putting the html string into the list here:</p>
<pre><code>soup = BeautifulSoup([html2])
</code></pre>
<p>Replace it with:</p>
<pre><code>soup = BeautifulSoup(html2)
</code></pre>
<p>Or, you can also pass the response file-like object, <code>BeautifulSoup</code> would read it for you:</p>
<... | 0 | 2016-07-24T17:06:03Z | [
"python",
"python-3.x",
"beautifulsoup"
] |
Mac OS X /bin/bash: python: command not found in some IDE | 38,554,566 | <p>When I compiled <code>test.py</code>(a very simple Python file) in Sublime Text or CodeRunner, I got the error:<code>/bin/bash: python: command not found</code>. Then I input <code>python test.py</code> in the Terminal app, it worked. Later I downloaded Pycharm and compiled the file again, it worked too! </p>
<p>So... | 4 | 2016-07-24T17:05:46Z | 38,554,744 | <p>The Terminal loads a number of files that can modify your PATH variable, including <code>~/.profile</code>, <code>~/.bashrc</code>, <code>~/.bash_profile</code>, etc. These do not get loaded when the Mac OS X system UI is started / when you login to your user profile via the Finder app. Consequently, apps started vi... | 4 | 2016-07-24T17:25:23Z | [
"python",
"bash",
"osx",
"sublimetext3",
"coderunner"
] |
Mac OS X /bin/bash: python: command not found in some IDE | 38,554,566 | <p>When I compiled <code>test.py</code>(a very simple Python file) in Sublime Text or CodeRunner, I got the error:<code>/bin/bash: python: command not found</code>. Then I input <code>python test.py</code> in the Terminal app, it worked. Later I downloaded Pycharm and compiled the file again, it worked too! </p>
<p>So... | 4 | 2016-07-24T17:05:46Z | 38,566,731 | <p>Thank everyone who helps. I've solved the problem myself.</p>
<p>I've always been using zsh instead of bash. After updating CodeRunner to the newest version, the app uses bash by default. So I just need go to Preference>Advanced menu and untick the checkbox <strong>invoke bash in login mode when running code</stron... | 0 | 2016-07-25T11:37:08Z | [
"python",
"bash",
"osx",
"sublimetext3",
"coderunner"
] |
Finding number of cells visited in given explanation | 38,554,587 | <p>This is a Hackerrank question.</p>
<p>Babai is standing in the top left cell (1,1) of an N*M table. The table has N rows and M columns. </p>
<p>Initially he is facing its right cell. He moves in the table in the following manner:</p>
<blockquote>
<ol>
<li>He moves one step forward</li>
<li>He turns to its r... | 0 | 2016-07-24T17:07:57Z | 38,554,824 | <p>The answer lies in the <code>9x9</code> matrix that you showed. The base conditions are trivial.</p>
<p>First suppose that N is even. Lets say 8. Then the path shall terminate at the cell that is marked 16 because all the 3 neighbouring cells would be already visited and no further path would be possible. Hence <co... | 1 | 2016-07-24T17:33:23Z | [
"python",
"algorithm"
] |
Finding number of cells visited in given explanation | 38,554,587 | <p>This is a Hackerrank question.</p>
<p>Babai is standing in the top left cell (1,1) of an N*M table. The table has N rows and M columns. </p>
<p>Initially he is facing its right cell. He moves in the table in the following manner:</p>
<blockquote>
<ol>
<li>He moves one step forward</li>
<li>He turns to its r... | 0 | 2016-07-24T17:07:57Z | 38,554,936 | <p>The code is almost correct.</p>
<p>It identifies 4 cases. The first two are trivial:</p>
<pre><code>if m == 0 or n == 0:
return 0
elif m == 1 and n == 1:
return 1
</code></pre>
<p>Those are obviously correct return values, and also serve as an end point to the recursion that is used in the third case.</p>... | 2 | 2016-07-24T17:44:10Z | [
"python",
"algorithm"
] |
hi § symbol unrecognized | 38,554,621 | <p>good morning.
I'm trying to do this and not leave me .</p>
<p>Can you help me?</p>
<p>thank you very much</p>
<pre><code> soup = BeautifulSoup(html_page)
titulo=soup.find('h3').get_text()
titulo=titulo.replace('§','')
titulo=titulo.replace('§','')
UnicodeDecodeError: 'ascii' codec can't deco... | 0 | 2016-07-24T17:11:54Z | 38,554,668 | <p><a href="http://stackoverflow.com/questions/3170211/why-declare-unicode-by-string-in-python">Define the <code>coding</code></a> and operate with <em>unicode strings</em>:</p>
<pre><code># -*- coding: utf-8 -*-
from bs4 import BeautifulSoup
html_page = u"<h3>§ title here</h3>"
soup = BeautifulSoup(htm... | 3 | 2016-07-24T17:17:06Z | [
"python",
"beautifulsoup",
"symbol"
] |
hi § symbol unrecognized | 38,554,621 | <p>good morning.
I'm trying to do this and not leave me .</p>
<p>Can you help me?</p>
<p>thank you very much</p>
<pre><code> soup = BeautifulSoup(html_page)
titulo=soup.find('h3').get_text()
titulo=titulo.replace('§','')
titulo=titulo.replace('§','')
UnicodeDecodeError: 'ascii' codec can't deco... | 0 | 2016-07-24T17:11:54Z | 38,555,143 | <p>I'll explain you clearly what's the problem:</p>
<p>By default Python does not recognize particular characters like "à " or "ò". To make Python recognize those characters you have to put at the top of your script:</p>
<pre><code># -*- coding: utf-8 -*-
</code></pre>
<p>This codes makes Python recognize particula... | 0 | 2016-07-24T18:05:54Z | [
"python",
"beautifulsoup",
"symbol"
] |
Python pysft/paramiko 'EOF during negotiation' error | 38,554,629 | <p>I'm using pysftp to download and upload some files. This exact same code I just run an hour before and was fine, but now I got this 'EOF during negotiation' error. What am I missing here?</p>
<pre><code>>>> sftp = pysftp.Connection(host, username=user, password=pasw)
>>> sftp
<pysftp.Connection... | 1 | 2016-07-24T17:13:13Z | 38,956,472 | <p>Turns out this was a connection issue in the SFTP server. Contacted the SFTP admin who fixed it, and now the same code works fine.</p>
| 0 | 2016-08-15T13:57:21Z | [
"python",
"python-2.7",
"paramiko",
"pysftp"
] |
django channels message.reply_channel no attribute send | 38,554,631 | <p>I've been trying to get my head around the channels of Django and I can't get my message to be sent to my websocket.</p>
<p>Here is my <code>consumers.py</code></p>
<pre><code>import logging
from django.contrib.sites.models import Site
from django.utils import timezone
from channels import Group
from .models impor... | 2 | 2016-07-24T17:13:20Z | 38,555,119 | <p>I assume you are calling <code>"send-free"</code> from your view like this...</p>
<pre><code>Channel('send-free').send({'message': 'your message'})
</code></pre>
<p>Then <code>send_free</code> doesn't have the <code>message.reply_channel</code>...</p>
<p>In other word once the <code>WebSocket packet is sent to us... | 1 | 2016-07-24T18:03:20Z | [
"python",
"django",
"django-channels"
] |
Add border under column headers in QTableWidget | 38,554,640 | <p>I have a table widget with two column header in a dialog that looks like this:</p>
<p><a href="http://i.stack.imgur.com/Gws4x.png" rel="nofollow"><img src="http://i.stack.imgur.com/Gws4x.png" alt="enter image description here"></a> </p>
<p>There is a separation between the column headers named "Index" and "Label",... | 1 | 2016-07-24T17:14:16Z | 38,804,069 | <p>I had the same problem. The first thing to note is that this only happens on Windows 10. On other OS, there is nothing to repair, it just works. On Windows 10 however, the painting primitives are not painting the bottom border (which is the default Windows 10 table header style - as can be seen in windows file explo... | 1 | 2016-08-06T12:00:27Z | [
"python",
"qt",
"pyqt",
"border",
"qtablewidget"
] |
How to stop (and restart!) a Tornado server? | 38,554,694 | <p>I want to be able to stop and restart a Tornado server for testing and demo purposes. But it doesn't seem to release the port.</p>
<p>The following code is based on <a href="http://stackoverflow.com/a/17325148/487992">answer showing how to properly stop Tornado</a>. I just added the code at the bottom that tries to... | 1 | 2016-07-24T17:20:14Z | 38,557,549 | <p>Don't use threads like this unless you <em>really</em> need to - they complicate things quite a bit. For tests, use <code>tornado.testing.AsyncTestCase</code> or <code>AsyncHTTPTestCase</code>. </p>
<p>To free the port, you need to stop the <code>HTTPServer</code>, not just the <code>IOLoop</code>. In fact, you mig... | 1 | 2016-07-24T22:40:27Z | [
"python",
"python-2.7",
"tornado"
] |
Python dict to DataFrame Pandas - levels | 38,554,706 | <p>Few months ago @Romain X. helped me a lot with this question:</p>
<p><a href="http://stackoverflow.com/questions/32770359/python-dict-to-dataframe-pandas/32771114#32771114">Python dict to DataFrame Pandas</a></p>
<p>Now I´m trying to do the same with deeper levels, here is the example:</p>
<pre><code> {u'instru... | 1 | 2016-07-24T17:22:06Z | 38,555,280 | <p>Here you go,</p>
<pre><code>df = pd.DataFrame.from_dict(d)\
.join(pd.DataFrame.from_dict(d['instruments']))\
.drop('instruments', axis=1)
df2 = pd.DataFrame.from_dict(df.interestRate[0])
df2 = pd.DataFrame.transpose(df2)
df2 = df2.reset_index()
df2.columns.values[0] = 'instrument'
print (df2)
instrument ask... | 1 | 2016-07-24T18:21:24Z | [
"python",
"pandas",
"dictionary"
] |
Django file size & content_type restriction at form level vs model? | 38,554,728 | <p>I am trying to implement file size & content_type restriction for my django file uploads. Ideally,i would like to validate before i upload. Initially i am using this reproduced code but it is not working.</p>
<pre><code>class ContentTypeRestrictedFileField(FileField):
"""
Same as FileField, but you can specify:... | 0 | 2016-07-24T17:24:20Z | 38,557,134 | <p>The answer is in the question. Model validations happen after the file has been uploaded to temp holding place in django while form validations happen before upload. So , the second part is the correct answer.</p>
| 0 | 2016-07-24T21:44:42Z | [
"python",
"django",
"validation"
] |
Can't update DNS record on Route 53 using boto3 | 38,554,754 | <p>I'm trying to get an dynamic DNS updater script working using AWS Route 53, python3 and boto3. It functions as follows:</p>
<ol>
<li>Retrieve machine IP from an internet service</li>
<li>Retrieve current IP in Route 53 DNS</li>
<li>Check if they match (if so, exit)</li>
<li>Update DNS (replace old IP with current o... | 1 | 2016-07-24T17:26:01Z | 38,556,615 | <p>I solved the problem. The <code>Region</code> option must only be set for latency-based record sets; commenting it out solved the problem.</p>
| 2 | 2016-07-24T20:46:21Z | [
"python",
"dns",
"amazon-route53",
"boto3"
] |
How to return the value of a variable only when a button has been clicked? | 38,554,807 | <p>My code:</p>
<pre><code>def file_exists(f_name):
select = 0
def skip():
nonlocal select
select = 1
err_msg.destroy()
def overwrite():
nonlocal select
select = 2
err_msg.destroy()
def rename():
glob... | 0 | 2016-07-24T17:32:15Z | 38,555,212 | <p>You can make use of the <a href="http://effbot.org/tkinterbook/widget.htm#Tkinter.Widget.update-method" rel="nofollow"><code>.update()</code></a> function to block without freezing the GUI. Basically you call <code>root.update()</code> in a loop until a condition is fulfilled. An example:</p>
<pre><code>def block()... | -1 | 2016-07-24T18:13:30Z | [
"python",
"tkinter"
] |
Search for a specific element in one array and copy the entire corresponding row in other array | 38,554,861 | <p>I have the following problem to which i haven't found any helpful hints anywhere so far.</p>
<p>I have two arrays which look like this:</p>
<pre><code>sample_nodes = [[ ID_1 x1 y1 z1]
[ ID_2 x2 y2 z2]
[ ID_3 x3 y3 z4]
.
.
... | 2 | 2016-07-24T17:37:07Z | 38,555,340 | <p>You can use <a href="http://docs.scipy.org/doc/numpy/reference/generated/numpy.searchsorted.html" rel="nofollow"><code>np.searchsorted</code></a> to form the original row order and then simply indexing into <code>sample_nodes</code> with it would give us the desired output. Thus, we would have an implementation like... | 1 | 2016-07-24T18:26:37Z | [
"python",
"arrays",
"numpy"
] |
Search for a specific element in one array and copy the entire corresponding row in other array | 38,554,861 | <p>I have the following problem to which i haven't found any helpful hints anywhere so far.</p>
<p>I have two arrays which look like this:</p>
<pre><code>sample_nodes = [[ ID_1 x1 y1 z1]
[ ID_2 x2 y2 z2]
[ ID_3 x3 y3 z4]
.
.
... | 2 | 2016-07-24T17:37:07Z | 38,555,347 | <p>The <a href="https://pypi.python.org/pypi/numpy-indexed" rel="nofollow">numpy_indexed</a> package has a function to solve the key step of your problem (finding the indices of one sequence in another). If you are unfamiliar with numpy, and care about efficiency at all, make sure to read up on that as well!</p>
<pre>... | 1 | 2016-07-24T18:27:08Z | [
"python",
"arrays",
"numpy"
] |
Why does this code returns last line of T matrix | 38,555,034 | <pre><code>class Solution:
"""
rotates, queries and stuff blah blah blah
"""
def mains(self):
pass
def rotate(self,A):
n = len(A[0])
T = [[0]*n]*n
# the above part is erraneous probably, on individual initialization it works!
for i in xrange(n):
for j in xrange(n)... | 0 | 2016-07-24T17:54:55Z | 38,555,068 | <p>With your approach, the same <em>sublist</em> is duplicated <code>n</code> times:</p>
<pre><code>T = [[0]*n]*n
</code></pre>
<p>So changes are reflected across them simultaneously.</p>
<hr>
<p>You should instead set up <code>T</code> like so:</p>
<pre><code>T = [[0]*n for _ in range(n)]
</code></pre>
<p>This ... | 1 | 2016-07-24T17:59:07Z | [
"python",
"list"
] |
Why does this code returns last line of T matrix | 38,555,034 | <pre><code>class Solution:
"""
rotates, queries and stuff blah blah blah
"""
def mains(self):
pass
def rotate(self,A):
n = len(A[0])
T = [[0]*n]*n
# the above part is erraneous probably, on individual initialization it works!
for i in xrange(n):
for j in xrange(n)... | 0 | 2016-07-24T17:54:55Z | 38,555,075 | <p>This is because <code>[[0]*n]*n</code> creates a list of size <code>n</code> filled with <em>references to the same list</em> (<code>[0]*n</code>), so when you're accessing <code>T[i][j]</code>, you're using the same memory location.</p>
<p>Here are some examples of different setup:</p>
<pre><code>>>> T=[... | 1 | 2016-07-24T18:00:00Z | [
"python",
"list"
] |
Why does this code returns last line of T matrix | 38,555,034 | <pre><code>class Solution:
"""
rotates, queries and stuff blah blah blah
"""
def mains(self):
pass
def rotate(self,A):
n = len(A[0])
T = [[0]*n]*n
# the above part is erraneous probably, on individual initialization it works!
for i in xrange(n):
for j in xrange(n)... | 0 | 2016-07-24T17:54:55Z | 38,555,081 | <p>You got caught by the mutability of <code>list</code> instances. Here</p>
<pre><code>T = [[0]*n]*n
</code></pre>
<p>The inner multiplication creates <code>n</code> references to an <code>int</code> instance. Since Python's <code>int</code>s are immutable, when you change one, a new object and a new reference is c... | 1 | 2016-07-24T18:00:21Z | [
"python",
"list"
] |
Why does this code returns last line of T matrix | 38,555,034 | <pre><code>class Solution:
"""
rotates, queries and stuff blah blah blah
"""
def mains(self):
pass
def rotate(self,A):
n = len(A[0])
T = [[0]*n]*n
# the above part is erraneous probably, on individual initialization it works!
for i in xrange(n):
for j in xrange(n)... | 0 | 2016-07-24T17:54:55Z | 38,555,186 | <p>You could also build your list while looping:</p>
<pre><code>>>> T = []
>>>
>>> for i in xrange(3):
T.append([])
for j in xrange(3):
T[i].append(l[j][i])
>>> T
[[1, 4, 7], [2, 5, 8], [3, 6, 9]]
</code></pre>
| 0 | 2016-07-24T18:09:56Z | [
"python",
"list"
] |
In Django REST is there a way of setting the key in a RetrieveAPIView, rather than filtering in a ListAPIView? | 38,555,057 | <p>In Django REST I have a ListAPIView, which I use to fetch records (usually just the one) based on the request user:</p>
<pre><code>class UserPageView(ListAPIView):
serializer_class = UserPageSerializer
def get_queryset(self):
return User.objects.filter(pk=self.request.user.pk)
</code></pre>
<p>Beca... | 1 | 2016-07-24T17:58:06Z | 38,557,900 | <p><code>ListAPIView</code> and <code>DetailAPIView</code> are <a href="https://github.com/tomchristie/django-rest-framework/blob/master/rest_framework/generics.py" rel="nofollow">GenericAPIViews</a>, with standard implementations of list-detail-create-update-delete <a href="https://github.com/tomchristie/django-rest-f... | 0 | 2016-07-24T23:33:38Z | [
"python",
"django",
"django-rest-framework"
] |
Finding most occuring substing in list | 38,555,061 | <p>I have a long list of sub-stings that I want to search through and find how many times two particular sub-stings occur. The following code is what I have started:</p>
<pre><code>dataA = ['0000000001001000',
'0000000010010001',
'0000000100100011',
'0000001001000100',
'0000010010001010',
'0000100100010100',
'00010010... | 0 | 2016-07-24T17:58:41Z | 38,556,385 | <p>I think what you want is something like the following. It sounds like you want to check the next item after a match against the first search.</p>
<pre><code>for i,text in enumerate(dataA):
if joined_A_Search_1 == text:
if joined_A_Search_2 == dataA[i+1][:-1]:
print 'logic stream 1'
... | 0 | 2016-07-24T20:18:15Z | [
"python",
"list",
"for-loop",
"substring"
] |
Splitting large file into smaller file giving memory error | 38,555,067 | <p>This is the python code i'm using. I have a 5gb file which i need to split in around 10-12 files according to line numbers. But this code gives a memory error. Please can someone tell me what is wrong with this code?</p>
<pre><code>from itertools import izip_longest
def grouper(n, iterable, fillvalue=None):
"C... | 0 | 2016-07-24T17:58:59Z | 38,555,531 | <p>Just use groupby, so you don't need to create 386972 iterators:</p>
<pre><code>from itertools import groupby
n = 386972
with open('reviewsNew.txt','rb') as f:
for idx, lines in groupby(enumerate(iterable), lambda (idx, _): idx // n):
with open('small_file_{0}'.format(idx * n), 'wb') as fout:
... | 0 | 2016-07-24T18:44:50Z | [
"python"
] |
python list of list unlinking the object | 38,555,102 | <p>I have two list that I combine into a single list. Later I want to make a copy of this list so I can do some manipulation of this second list without affecting my first list. My understanding is if you use this [:] it should unlink the list and make a second copy of the list in a independent memory location. My prob... | 0 | 2016-07-24T18:02:01Z | 38,555,138 | <p><code>[:]</code> only makes a shallow copy. That is, it copies the list itself but not the items in the list. You should use <code>copy.deepcopy</code>. </p>
<pre><code>import copy
d = copy.deepcopy(c)
</code></pre>
<p>Think of a list as having pointers to objects. Now your variable is a pointer to the list. What ... | 2 | 2016-07-24T18:05:35Z | [
"python",
"python-3.x"
] |
python list of list unlinking the object | 38,555,102 | <p>I have two list that I combine into a single list. Later I want to make a copy of this list so I can do some manipulation of this second list without affecting my first list. My understanding is if you use this [:] it should unlink the list and make a second copy of the list in a independent memory location. My prob... | 0 | 2016-07-24T18:02:01Z | 38,555,192 | <p>You have come across the concept of shallow and deep copy in Python.</p>
<p>The slice operator works well when the list structures do not have any sublists. </p>
<pre><code>list1 = ['a', 'b', 'c', 'd']
list2 = list1[:]
list2[1] = 'x'
print list1
['a', 'b', 'c', 'd']
print list2
['a', 'x', 'c', 'd']
</code></pre>
... | 0 | 2016-07-24T18:10:50Z | [
"python",
"python-3.x"
] |
Hardware requirements to deal with a big matrix - python | 38,555,120 | <p>I am working on a python project where I will need to work with a matrix whose size is around 10000X10000X10000.</p>
<p>Considering that:</p>
<ul>
<li>The matrix will be dense, and should be stored in the RAM.</li>
<li>I will need to perform linear algebra (with numpy, I think) on that matrix, with around O(n^3) w... | 1 | 2016-07-24T18:03:25Z | 38,555,206 | <p>Actually, the memory would be a big issue here. Depending on the type of the matrix elements. Each float takes 24 bytes for example as it is a boxed object. As your matrix is 10^12 you can do the math.
Switching to C would probably make it more memory-efficient, but not faster, as numpy is essentially written in C ... | 0 | 2016-07-24T18:13:09Z | [
"python",
"numpy",
"matrix"
] |
Hardware requirements to deal with a big matrix - python | 38,555,120 | <p>I am working on a python project where I will need to work with a matrix whose size is around 10000X10000X10000.</p>
<p>Considering that:</p>
<ul>
<li>The matrix will be dense, and should be stored in the RAM.</li>
<li>I will need to perform linear algebra (with numpy, I think) on that matrix, with around O(n^3) w... | 1 | 2016-07-24T18:03:25Z | 38,555,266 | <p>Well, the first question is, wich type of value will you store in your matrix?
Suposing it will be of integers (and suposing that every bytes uses the ISO specification for size, 4 bytes), you will have 4*10^12 bytes to store. That's a large amount of information (4 TB), so, in first place, I don't know from where y... | 4 | 2016-07-24T18:19:43Z | [
"python",
"numpy",
"matrix"
] |
Hardware requirements to deal with a big matrix - python | 38,555,120 | <p>I am working on a python project where I will need to work with a matrix whose size is around 10000X10000X10000.</p>
<p>Considering that:</p>
<ul>
<li>The matrix will be dense, and should be stored in the RAM.</li>
<li>I will need to perform linear algebra (with numpy, I think) on that matrix, with around O(n^3) w... | 1 | 2016-07-24T18:03:25Z | 38,558,638 | <p>Maybe something like <a href="http://dask.pydata.org/en/latest/" rel="nofollow">dask</a> would be a good fit for you? There are other ways to do this with numpy like using memory mapped arrarys and doing operations in parallelizable chunks, but will be a bit more difficult especially if you are still getting comfort... | 1 | 2016-07-25T01:46:53Z | [
"python",
"numpy",
"matrix"
] |
Scrapy: Custom Call-Backs do not work | 38,555,128 | <p>I'm at a loss for why my spider doesn't work! I am by <strong>no</strong> means a programmer so please be kind! haha</p>
<p><strong>Background:</strong>
I'm trying to scrape the information pertaining to books found on Indigo with the use of "Scrapy".</p>
<p><strong>Problem:</strong>
My code does not enter any of... | 1 | 2016-07-24T18:04:10Z | 38,555,269 | <p>One of the first ploblems I've noticed is that your <code>allowed_domains</code> class attribute is broken. It should contain <strong>domains</strong> (thus the name).</p>
<p>Correct value in your case would be: </p>
<pre><code>allowed_domains = [
"chapters.indigo.ca", # subdomain.domain.top_level_domain
]
<... | 1 | 2016-07-24T18:20:09Z | [
"python",
"callback",
"scrapy",
"web-crawler"
] |
AttributeError: 'module' object has no attribute 'compile' | 38,555,161 | <p>I have the following code that I saved as re.py </p>
<pre><code>import sys
pattern ="Fred"
import re
regexp = re.compile(pattern)
for line in sys.stdin:
result = regexp.search(line)
if result:
sys.stdout.write(line)
</code></pre>
<p>When I execute this file in terminal - </p>
<pre><code>$python ... | 0 | 2016-07-24T18:07:50Z | 38,555,177 | <p>Rename your script from <code>re.py</code> to something else. The name you have chosen is <em>shadowing</em> the <code>re</code> module you intend to use.</p>
| 2 | 2016-07-24T18:08:51Z | [
"python",
"regex"
] |
Callback at random times from a child process with infinite loop, and termination | 38,555,189 | <p>I need to react in a main process to random events happening in a child process. I have implemented this with a queue between the main and the child process, and a 'queue poller' running in a secondary thread of the main process and calling a callback function each time it finds an item in the queue. The code is bel... | 0 | 2016-07-24T18:10:15Z | 38,556,065 | <p>General observations:</p>
<p><strong>class MyChildProcess</strong></p>
<p>You don't need to create separate classes for the child process and listener thread. Simple functions can work.</p>
<p><strong>pollQueue</strong></p>
<p>You can use a blocking get() call in the listener thread. This will make that thread m... | 0 | 2016-07-24T19:46:03Z | [
"python",
"multithreading",
"multiprocessing"
] |
Get all twitter mentions using tweepy for users with Millions of followers | 38,555,191 | <p>I have had a project in mind where I would download all the tweets sent to celebrities for the last one year and do a sentiment analysis on them and evaluate who had the most positive fans.</p>
<p>Then I discovered that you can at max retrieve twitter mentions for the last 7 days using tweepy/twitter API. I scaveng... | 1 | 2016-07-24T18:10:45Z | 39,671,701 | <p>I would use the search api. I did something similar with the following code. It appears to have worked exactly as expected. I used it on a specific movie star, and pulled 15568 tweets, upon a quick scan all of which appear to be @mentions of them. (I pulled from their entire timeline.)</p>
<p>In your case, on a... | 1 | 2016-09-24T01:42:02Z | [
"python",
"twitter",
"tweepy",
"sentiment-analysis"
] |
tornado async post error 500 but curl OK | 38,555,201 | <p>URL is <code>http://*.*.*.*/100/?id=1&version=1</code></p>
<p>params is </p>
<pre><code>{"cityId": "110000", "query": {"queryStr": "line1", "queryExp": ""}, "channelId": "house"}
</code></pre>
<p>curl command is: </p>
<pre><code>curl -X POST -H "Content-Type: application/json" -d '{"cityId": "110000", "query... | 0 | 2016-07-24T18:11:49Z | 38,559,139 | <p>You're sending <code>'content-type': 'application/json',</code> but encoding the data with <code>body=urllib.urlencode(data).encode('utf-8')</code>. Use <code>json.dumps</code> instead of <code>urllib.urlencode</code>. </p>
| 0 | 2016-07-25T03:06:34Z | [
"python",
"tornado"
] |
Python script is killed from within, but the process doesn't die | 38,555,202 | <p>I'm trying to execute a python script using php with an exec command like this:</p>
<pre><code>exec("python /address/to/script.py");
</code></pre>
<p>I don't need the script to run to completion, so after it does what I need, I call <code>sys.exit()</code> from within it. Execution is passed back to the php script... | 1 | 2016-07-24T18:12:13Z | 38,555,308 | <p>The script could still be executing some cleanup code, or you could be calling <code>sys.exit()</code> from a child process which will essentially be calling <code>thread.exit()</code>, leaving the parent process running.</p>
<p>Check that the <code>sys.exit()</code> call is in the main part of the script and that ... | 0 | 2016-07-24T18:23:50Z | [
"php",
"python",
"linux",
"exec"
] |
filtering index Pandas groupby | 38,555,215 | <p>I have a frame like this</p>
<pre><code>frame=pd.DataFrame({'Team':['USA','GER','CAN','USA','GER','CAN'],
'MOV':[-5,2,0,0,3,4]})
</code></pre>
<p>I can do a groupby to get the mean 'MOV' for each team</p>
<pre><code>print (frame.groupby('Team')['MOV'].mean())
</code></pre>
<p>which outputs</p>
<... | -1 | 2016-07-24T18:13:44Z | 38,555,271 | <pre><code>means = frame.groupby('Team')['MOV'].mean()
print (list(means[means > 0].index))
</code></pre>
<p><code>means</code> is a series which you can then filter by taking all values in that series that are greater than 0. Then take the index of that filtered series (which will contain the country names) and ... | 1 | 2016-07-24T18:20:21Z | [
"python",
"pandas"
] |
Remove Objects Containing certain Data from a list | 38,555,253 | <p>We are all well aware that we can insert a vast array of datatypes into a python list. For eg. a list of characters </p>
<pre><code>X=['a','b','c']
</code></pre>
<p>To remove 'c' all i have to do is</p>
<pre><code>X.remove('c')
</code></pre>
<p>Now What I need is to remove an object containing a certain string.<... | 0 | 2016-07-24T18:18:17Z | 38,555,399 | <p>For the list</p>
<pre><code>X = [('a',0),('b',0),('c',0)]
</code></pre>
<p>If you know that the first item of a tuple is always a string, and you want to remove that string if it has a distinct value, then use a list comprehension:</p>
<pre><code>X = [('a',0),('b',0),('c',0)]
X = [(i,j) for i, j in X if i != '... | 0 | 2016-07-24T18:32:19Z | [
"python",
"python-3.x"
] |
Remove Objects Containing certain Data from a list | 38,555,253 | <p>We are all well aware that we can insert a vast array of datatypes into a python list. For eg. a list of characters </p>
<pre><code>X=['a','b','c']
</code></pre>
<p>To remove 'c' all i have to do is</p>
<pre><code>X.remove('c')
</code></pre>
<p>Now What I need is to remove an object containing a certain string.<... | 0 | 2016-07-24T18:18:17Z | 38,555,471 | <p>I think what you want is this:</p>
<pre><code>>>> class MyObject:
... def __init__(self, i, j):
... self.i = i
... self.j = j
... def __repr__(self):
... return '{} - {}'.format(self.i, self.j)
...
>>> x = [MyObject(1, 'c'), MyObject(2, 'd'), MyObject(3, 'e')]
>>> re... | 1 | 2016-07-24T18:38:34Z | [
"python",
"python-3.x"
] |
Remove Objects Containing certain Data from a list | 38,555,253 | <p>We are all well aware that we can insert a vast array of datatypes into a python list. For eg. a list of characters </p>
<pre><code>X=['a','b','c']
</code></pre>
<p>To remove 'c' all i have to do is</p>
<pre><code>X.remove('c')
</code></pre>
<p>Now What I need is to remove an object containing a certain string.<... | 0 | 2016-07-24T18:18:17Z | 38,555,666 | <p>The following function will remove <strong>in place</strong> all the items for them condition is <code>True</code>:</p>
<pre><code>def remove(list,condtion):
ii = 0
while ii < len(list):
if condtion(list[ii]):
list.pop(ii)
continue
ii += 1
</code></pre>
<p... | 1 | 2016-07-24T18:59:41Z | [
"python",
"python-3.x"
] |
Is there any function in openCV or another library that can tile squares within an arbitrary contour? | 38,555,275 | <p>I have images where I've found some contours around dogs, e.g.:</p>
<p><a href="http://i.stack.imgur.com/RLX2L.jpg" rel="nofollow"><img src="http://i.stack.imgur.com/RLX2L.jpg" alt="dog contour"></a></p>
<p>I want to tile squares/rectangles inside of the contour. Is there an openCV (or other library) function for... | 0 | 2016-07-24T18:20:43Z | 38,557,098 | <p>I was able to solve this by first drawing rectangles over the entire image, then checking which ones were in the area with the dog:</p>
<pre><code># the image here is stored as the variable fg
# with b, g, r, and alpha channels
# the alpha channel is masking the dog part of the image
import cv2
b, g, r, a = cv2.sp... | 0 | 2016-07-24T21:40:56Z | [
"python",
"python-3.x",
"opencv",
"computer-vision"
] |
python regex matching between two strings | 38,555,310 | <p>I have the following string:</p>
<pre><code>property some_property_name;
@(posedge some_clock) disable iff (some_other_signal)
signalA && signalB || !($isunknown(some_other_signal)) &&
|-> !($isunknown(should_not_match_this))
endproperty
more_random_code
property some_other_proper... | 1 | 2016-07-24T18:23:59Z | 38,555,454 | <p>I would use something like</p>
<pre><code>(?<=@\(posedge).*?(\!\(\$isunknown\(.*?\)\)).*?\|->
</code></pre>
<p><img src="https://www.debuggex.com/i/S5hvPO6L2aUjLsUN.png" alt="Regular expression visualization"></p>
<p><a href="https://www.debuggex.com/r/S5hvPO6L2aUjLsUN" rel="nofollow">Debuggex Demo</a></p>
... | 1 | 2016-07-24T18:37:16Z | [
"python",
"regex",
"pattern-matching"
] |
extract hours and minutes from string python | 38,555,327 | <p>I have a string that is in the format of '00:00' displaying the time, it can be any time. I would like to extract the hours and minutes into individual variables. </p>
| 0 | 2016-07-24T18:25:27Z | 38,555,350 | <p>The <a href="https://docs.python.org/2/library/stdtypes.html#str.split" rel="nofollow">split</a> function is your friend here:</p>
<pre><code>>>> time = "11:23"
>>> hours, minutes = time.split(":")
>>> print hours
11
>>> print minutes
23
</code></pre>
| 1 | 2016-07-24T18:27:27Z | [
"python",
"python-2.7",
"python-3.x"
] |
extract hours and minutes from string python | 38,555,327 | <p>I have a string that is in the format of '00:00' displaying the time, it can be any time. I would like to extract the hours and minutes into individual variables. </p>
| 0 | 2016-07-24T18:25:27Z | 38,555,359 | <p>If it always in the same format you could <code>split</code> it by the colons:</p>
<pre><code>hours, minutes = "00:00".split(":")
</code></pre>
| 1 | 2016-07-24T18:28:03Z | [
"python",
"python-2.7",
"python-3.x"
] |
extract hours and minutes from string python | 38,555,327 | <p>I have a string that is in the format of '00:00' displaying the time, it can be any time. I would like to extract the hours and minutes into individual variables. </p>
| 0 | 2016-07-24T18:25:27Z | 38,555,367 | <p>You may want <code>hours</code> and <code>minutes</code> be integers:</p>
<pre><code>hours, minutes = map(int, "00:00".split(':'))
</code></pre>
<hr>
<h2>How this works</h2>
<ol>
<li><code>str.split(delim)</code> splits a <code>str</code> using <code>delim</code> as delimiter. Returns a list: <code>"00:00".split... | 3 | 2016-07-24T18:28:42Z | [
"python",
"python-2.7",
"python-3.x"
] |
extract hours and minutes from string python | 38,555,327 | <p>I have a string that is in the format of '00:00' displaying the time, it can be any time. I would like to extract the hours and minutes into individual variables. </p>
| 0 | 2016-07-24T18:25:27Z | 38,555,558 | <p>For parsing times, use the <code>datetime</code>-class:</p>
<pre><code>import datetime
time = datetime.datetime.strptime('23:43', '%H:%M')
print time.hour, time.minute
</code></pre>
| 1 | 2016-07-24T18:47:57Z | [
"python",
"python-2.7",
"python-3.x"
] |
Google app engine endpoints api python | 38,555,353 | <p>I am facing a problem in endpoint. I am using google app engine on local machine. I am trying to make a endpoint api. The api is created successfully but when i open explorer and select my api give some parameters to it. It does not return response. In response it said 404 not found</p>
<p>Here is the code:</p>
<p... | 1 | 2016-07-24T18:27:31Z | 38,570,856 | <p>@Scarygami Answere is correct. I have to remove the hostname because i am using it on local host.</p>
| 1 | 2016-07-25T14:45:33Z | [
"python",
"google-app-engine",
"google-cloud-endpoints",
"webapp2"
] |
Removing duplicate edges from graph in Python list | 38,555,385 | <p>My program returns a list of tuples, which represent the edges of a graph, in the form of:</p>
<pre><code>[(i, (e, 130)), (e, (i, 130)), (g, (a, 65)), (g, (d, 15)), (a, (g, 65))]
</code></pre>
<p>So, (i, (e, 130)) means that 'i' is connected to 'e' and is 130 units away.</p>
<p>Similarly, (e, (i, 130)) means that... | 6 | 2016-07-24T18:30:45Z | 38,555,503 | <p>If a tuple <code>(n1, (n2, distance))</code> represents a bidirectional connection, I would introduce a normalization property which constraints the ordering of the two nodes in the tuple. This way, each possible edge has exactly one unique representation.</p>
<p>Consequently, a normalization function would map a g... | 7 | 2016-07-24T18:41:32Z | [
"python"
] |
Removing duplicate edges from graph in Python list | 38,555,385 | <p>My program returns a list of tuples, which represent the edges of a graph, in the form of:</p>
<pre><code>[(i, (e, 130)), (e, (i, 130)), (g, (a, 65)), (g, (d, 15)), (a, (g, 65))]
</code></pre>
<p>So, (i, (e, 130)) means that 'i' is connected to 'e' and is 130 units away.</p>
<p>Similarly, (e, (i, 130)) means that... | 6 | 2016-07-24T18:30:45Z | 38,555,525 | <p>Reconstruct each edge to take its alternate form and check if the alternate form is already in a new set. If it is not then add to the set:</p>
<pre><code>lst = [('i', ('e', 130)), ('e', ('i', 130)), ('g', ('a', 65)), ('g', ('d', 15)), ('a', ('g', 65))]
r = set()
for e, v in lst:
if (v[0], (e, v[1])) in r:
... | 2 | 2016-07-24T18:44:26Z | [
"python"
] |
Removing duplicate edges from graph in Python list | 38,555,385 | <p>My program returns a list of tuples, which represent the edges of a graph, in the form of:</p>
<pre><code>[(i, (e, 130)), (e, (i, 130)), (g, (a, 65)), (g, (d, 15)), (a, (g, 65))]
</code></pre>
<p>So, (i, (e, 130)) means that 'i' is connected to 'e' and is 130 units away.</p>
<p>Similarly, (e, (i, 130)) means that... | 6 | 2016-07-24T18:30:45Z | 38,555,529 | <p>The simplest solution to write would be simply to iterator and check equality of all of them:</p>
<pre><code>def edge_equal(edge_tuple1, edge_tuple2):
return edge_tuple1[0] == edge_tuple2[1][0] and edge_tuple2[0] == edge_t\
uple1[1][0]
new = []
for i in range(len(graph)):
found_equal = False
for e... | 2 | 2016-07-24T18:44:36Z | [
"python"
] |
Removing duplicate edges from graph in Python list | 38,555,385 | <p>My program returns a list of tuples, which represent the edges of a graph, in the form of:</p>
<pre><code>[(i, (e, 130)), (e, (i, 130)), (g, (a, 65)), (g, (d, 15)), (a, (g, 65))]
</code></pre>
<p>So, (i, (e, 130)) means that 'i' is connected to 'e' and is 130 units away.</p>
<p>Similarly, (e, (i, 130)) means that... | 6 | 2016-07-24T18:30:45Z | 38,555,565 | <pre><code>edges = [(i, (e, 130)), (e, (i, 130)), (g, (a, 65)), (g, (d, 15)), (a, (g, 65))]
for each in edges:
try:
edges.remove((each[1][0], (each[0], each[1][1])))
except ValueError:
pass
</code></pre>
<p>reverse the vectors and remove them as you traverse</p>
| 2 | 2016-07-24T18:48:34Z | [
"python"
] |
In DRF(django-rest-framework), AttributeError 'str' object has no attribute '~~' How to solve it? | 38,555,457 | <p>I'm using DRF and be front of AttributeError 'str' object has no attribute '~~'.</p>
<p><strong>my error page and code</strong></p>
<pre><code>Environment:
Request Method: GET
Request URL: http://127.0.0.1:8000/blog/
Django Version: 1.9.7
Python Version: 3.5.2
Installed Applications:
['django.contrib.admin',
'... | 1 | 2016-07-24T18:37:35Z | 38,555,797 | <p>This has nothing to do with your serializer, or where you put it. The error traceback is telling you that the error happens in the view.</p>
<p>So, in your post_list view, you build up a list (also called <code>post_list</code>) which is populated by a list of strings. Then you try and put it through the PostSerial... | 0 | 2016-07-24T19:14:47Z | [
"python",
"django",
"django-rest-framework"
] |
Euclidean Algorithm (subtraction) in python | 38,555,486 | <p>In "Great Mathematical problems -- Vision of infinity", page 18 Ian Stewart referred Euclid's proposition 2, Book VII of Element which is a very elementary method of finding Greatest common divisor. I quote "It works by repeatedly subtracting the smaller number from the larger one, then applying a similar process to... | -5 | 2016-07-24T18:39:35Z | 38,571,393 | <p>A typical fast solution to the gcd algorithm would be some iterative version like this one:</p>
<pre><code>def gcd(x, y):
while y != 0:
(x, y) = (y, x % y)
return x
</code></pre>
<p>In fact, in python you'd just use directly the gcd function provided by fractions module.</p>
<p>And if you wanted ... | 0 | 2016-07-25T15:10:11Z | [
"python",
"algorithm",
"subtraction",
"greatest-common-divisor"
] |
How to read lines from file starting from arbitrary newline in Python | 38,555,592 | <p>I have a file formatted in a way that lines are separated with a new line, like the following</p>
<pre><code>1 1 1 1
2 2 2 2 2 2 2
3 3 3 3 3 3
</code></pre>
<p>I would like to read the lines separately starting, for example, from the second one and save them in an array. I think I can manage the last part, but I ... | 1 | 2016-07-24T18:51:06Z | 38,555,654 | <p>As files are iterable in python you could call <a href="https://docs.python.org/2/library/stdtypes.html#iterator.next" rel="nofollow"><code>next</code></a> on it to skip the first line, for example:</p>
<pre><code>with open('data.txt', 'r') as data:
next(data)
for line in data:
print line.split()
</... | 2 | 2016-07-24T18:58:17Z | [
"python",
"file",
"newline"
] |
How to read lines from file starting from arbitrary newline in Python | 38,555,592 | <p>I have a file formatted in a way that lines are separated with a new line, like the following</p>
<pre><code>1 1 1 1
2 2 2 2 2 2 2
3 3 3 3 3 3
</code></pre>
<p>I would like to read the lines separately starting, for example, from the second one and save them in an array. I think I can manage the last part, but I ... | 1 | 2016-07-24T18:51:06Z | 38,555,691 | <p>If you know a-priori the line you want to start reading from, just use <code>f.read().splitlines()</code> to get a list of all the lines and then extract the required list suffix using slices as shown below.</p>
<pre><code>n = 1
with open('filename.txt') as f:
lines = f.read().splitlines()[n:]
print(lines)
</... | 0 | 2016-07-24T19:02:32Z | [
"python",
"file",
"newline"
] |
How to read lines from file starting from arbitrary newline in Python | 38,555,592 | <p>I have a file formatted in a way that lines are separated with a new line, like the following</p>
<pre><code>1 1 1 1
2 2 2 2 2 2 2
3 3 3 3 3 3
</code></pre>
<p>I would like to read the lines separately starting, for example, from the second one and save them in an array. I think I can manage the last part, but I ... | 1 | 2016-07-24T18:51:06Z | 38,555,699 | <pre><code>lines = open('test.txt', 'r').readlines()
# n is your desired line
for lineno in range(n-1, len(lines)):
print list(lines[lineno].strip())
</code></pre>
| 1 | 2016-07-24T19:03:22Z | [
"python",
"file",
"newline"
] |
How to read lines from file starting from arbitrary newline in Python | 38,555,592 | <p>I have a file formatted in a way that lines are separated with a new line, like the following</p>
<pre><code>1 1 1 1
2 2 2 2 2 2 2
3 3 3 3 3 3
</code></pre>
<p>I would like to read the lines separately starting, for example, from the second one and save them in an array. I think I can manage the last part, but I ... | 1 | 2016-07-24T18:51:06Z | 38,555,760 | <p>You cannot jump directly to a specific line. You have to read the first n lines:</p>
<pre><code>n = 1
with open('data.txt', 'r') as data:
for idx, _ in enumerate(data):
if idx == n:
break
for line in data:
print line.split()
</code></pre>
| 0 | 2016-07-24T19:10:19Z | [
"python",
"file",
"newline"
] |
How to read lines from file starting from arbitrary newline in Python | 38,555,592 | <p>I have a file formatted in a way that lines are separated with a new line, like the following</p>
<pre><code>1 1 1 1
2 2 2 2 2 2 2
3 3 3 3 3 3
</code></pre>
<p>I would like to read the lines separately starting, for example, from the second one and save them in an array. I think I can manage the last part, but I ... | 1 | 2016-07-24T18:51:06Z | 38,555,765 | <p>Well, you could do something like this:</p>
<pre><code>n1, n2 = 0, 2
with open('filename.txt') as f:
print '\n'.join(f.read().split('\n')[n1:n2+1])
</code></pre>
<p>This would produce (as per the contents in the file you've posted) the output like this:</p>
<pre><code>1 1 1 1
2 2 2 2 2 2 2
3 3 3 3 3 3
</cod... | 1 | 2016-07-24T19:11:11Z | [
"python",
"file",
"newline"
] |
How to read lines from file starting from arbitrary newline in Python | 38,555,592 | <p>I have a file formatted in a way that lines are separated with a new line, like the following</p>
<pre><code>1 1 1 1
2 2 2 2 2 2 2
3 3 3 3 3 3
</code></pre>
<p>I would like to read the lines separately starting, for example, from the second one and save them in an array. I think I can manage the last part, but I ... | 1 | 2016-07-24T18:51:06Z | 38,555,767 | <p>You can use <code>itertool.islice</code> for this, eg:</p>
<pre><code>from itertools import islice
with open('filename') as fin:
wanted = islice(fin, 1, None) # change 1 to lines to skip
data = [line.split() for line in wanted]
</code></pre>
| 2 | 2016-07-24T19:11:35Z | [
"python",
"file",
"newline"
] |
pypyodbc: OPENJSON incorrect syntax near keyword "WITH" | 38,555,706 | <p>I'm trying to use OPENJSON in a Python script to import some basic JSON into a SQL database. I initially tried with a more complex JSON file, but simplified it for the sake of this post. Here's what I have:</p>
<pre><code>sql_statement = "declare @json nvarchar(max) = '{\"name\":\"James\"}'; SELECT * FROM OPENJSON(... | 1 | 2016-07-24T19:04:10Z | 38,654,974 | <p>The problem could be that your database is running in an older compatibility level, where OPEN JSON is not available.</p>
<p>To find the compatibility level of your database, run following SQL statement:</p>
<pre><code>SELECT compatibility_level FROM sys.databases WHERE name = 'your_db_name';
</code></pre>
<p>If... | 3 | 2016-07-29T09:15:21Z | [
"python",
"sql",
"sql-server",
"json",
"pypyodbc"
] |
How to center vertically and horizontally a heading text using flask-bootstrap | 38,555,814 | <p>How can I bring a heading text in the middle of a page? I'm using flask-bootstrap and I would like to customize it with my own CSS style.</p>
<p>Here's my sample code:</p>
<p><strong>HTML</strong></p>
<pre><code>{% extends "bootstrap/base.html" %}
{% block head %}
<meta charset="utf-8">
<meta http-equiv... | 0 | 2016-07-24T19:17:11Z | 38,555,834 | <p>In order to use <code>display: table-cell;</code> in this way, the parent element must be set to <code>display: table;</code>. After this it should work.</p>
<pre><code>.header {
display: table;
}
</code></pre>
| 0 | 2016-07-24T19:19:07Z | [
"python",
"html",
"css",
"twitter-bootstrap"
] |
How to center vertically and horizontally a heading text using flask-bootstrap | 38,555,814 | <p>How can I bring a heading text in the middle of a page? I'm using flask-bootstrap and I would like to customize it with my own CSS style.</p>
<p>Here's my sample code:</p>
<p><strong>HTML</strong></p>
<pre><code>{% extends "bootstrap/base.html" %}
{% block head %}
<meta charset="utf-8">
<meta http-equiv... | 0 | 2016-07-24T19:17:11Z | 38,555,894 | <p>I think this will help you.</p>
<pre><code>.text-vertical-center{
height: 100px;
width: 100px;
background-color: #036;
left: 0;
margin: auto;
position: absolute;
top: 0;
right: 0;
bottom: 0;
}
<div class="text-vertical-center">
<h1>Welcome to my Site</h1>
<h3>My portfolio&l... | 0 | 2016-07-24T19:26:12Z | [
"python",
"html",
"css",
"twitter-bootstrap"
] |
How to center vertically and horizontally a heading text using flask-bootstrap | 38,555,814 | <p>How can I bring a heading text in the middle of a page? I'm using flask-bootstrap and I would like to customize it with my own CSS style.</p>
<p>Here's my sample code:</p>
<p><strong>HTML</strong></p>
<pre><code>{% extends "bootstrap/base.html" %}
{% block head %}
<meta charset="utf-8">
<meta http-equiv... | 0 | 2016-07-24T19:17:11Z | 38,556,244 | <p>If you're trying to place the content (both vertically and horizontally) center of the page you can use <code>position: absolute</code> with <a href="https://developer.mozilla.org/en-US/docs/Web/CSS/transform" rel="nofollow">2D Transforms</a>.</p>
<p>*You may want to use a media query for smaller viewports but it i... | 0 | 2016-07-24T20:04:55Z | [
"python",
"html",
"css",
"twitter-bootstrap"
] |
convert json retrived from url | 38,555,872 | <p>I am partially able to work with json saved as file:</p>
<pre><code>#! /usr/bin/python3
import json
from pprint import pprint
json_file='a.json'
json_data=open(json_file)
data = json.load(json_data)
json_data.close()
print(data[10])
</code></pre>
<p>But I am trying to achieve the same from data directly from we... | 1 | 2016-07-24T19:23:42Z | 38,556,264 | <p>It's actually telling you the answer: you're getting back a byte array, where in Python 3 a string is different because of dealing with unicode. In Python 2.7, it would work. You should be able to fix it by converting your bytes explicitly to a string with </p>
<pre><code>jsonget=str(urlopen("http://api.crossref.o... | -1 | 2016-07-24T20:06:27Z | [
"python",
"json",
"python-3.x"
] |
groupby DataFrame with new column representing the group | 38,555,880 | <p>I have a DataFrame with a timestamp column</p>
<pre><code>d1=DataFrame({'a':[datetime(2015,1,1,20,2,1),datetime(2015,1,1,20,14,58),
datetime(2015,1,1,20,17,5),datetime(2015,1,1,20,31,5),
datetime(2015,1,1,20,34,28),datetime(2015,1,1,20,37,51),datetime(2015,1,1,20,41,19),
datetime(2015,1,1,20,49,4),datetime(2015,1,1... | 0 | 2016-07-24T19:24:32Z | 38,556,106 | <p>Use <code>.transform()</code> on your <code>groupby</code> object with an <code>itertools.count</code> iterator:</p>
<pre><code>from datetime import datetime
from itertools import count
import pandas as pd
d1 = pd.DataFrame({'a': [datetime(2015,1,1,20,2,1), datetime(2015,1,1,20,14,58),
dat... | 1 | 2016-07-24T19:50:48Z | [
"python",
"pandas"
] |
Find duplicates in mulitple columns and drop rows - Pandas | 38,555,922 | <p>If the name appears in any subsequent row, I want to drop that row. Mainly i'm not sure how to get the index of that found duplicate and then use that index number to drop it from df.</p>
<pre><code>import pandas as pd
data = {'interviewer': ['Jason', 'Molly', 'Jermaine', 'Jake', 'Amy'],
'candidate': ['Bob... | 1 | 2016-07-24T19:29:06Z | 38,555,985 | <p>(At the time when this answer was written, there was some discrepancy between the verbal description and the code example.)</p>
<p>You can use <a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.Series.isin.html" rel="nofollow"><code>isin</code></a> to check if an item appears in a different colum... | 1 | 2016-07-24T19:36:27Z | [
"python",
"pandas",
"rows"
] |
Find duplicates in mulitple columns and drop rows - Pandas | 38,555,922 | <p>If the name appears in any subsequent row, I want to drop that row. Mainly i'm not sure how to get the index of that found duplicate and then use that index number to drop it from df.</p>
<pre><code>import pandas as pd
data = {'interviewer': ['Jason', 'Molly', 'Jermaine', 'Jake', 'Amy'],
'candidate': ['Bob... | 1 | 2016-07-24T19:29:06Z | 38,559,361 | <p>I made a function for what I want to do. Using <code>df.index</code> makes it safe to use for any numerical index.</p>
<pre><code>def drop_dup_rows(df):
names = []
for i, c, ind in zip(df.interviewer, df.candidate, df.index.tolist()):
if any(x in names for x in [i, c]):
df.drop(ind, inpl... | 0 | 2016-07-25T03:39:28Z | [
"python",
"pandas",
"rows"
] |
How to config file name of logger in each class in scrapy? | 38,555,996 | <p>I have used scrapy for several months.Several weeks ago,I started to use file to record log information.I wrote <code>log-to-file</code> function as this: </p>
<pre><code>def logging_to_file(file_name):
import logging
from scrapy.utils.log import configure_logging
filename = '%s-log.txt' % file_name
import os
... | 1 | 2016-07-24T19:37:49Z | 38,556,095 | <p>I'm not sure if I understand what your question is but in general you don't have to create any functions or anything to configure your logger.</p>
<p>What you should do create a logger and assign it a <code>FileHandler</code> and then just use your created logger to log your info.</p>
<pre><code>import logging
log... | 1 | 2016-07-24T19:49:39Z | [
"python",
"logging",
"scrapy"
] |
In Tensorflow, what is the difference between a Variable and a Tensor? | 38,556,078 | <p>The Tensorflow documentation states that a <code>Variable</code> can be used any place a <code>Tensor</code> can be used, and they seem to be fairly interchangeable. For example, if <code>v</code> is a <code>Variable</code>, then <code>x = 1.0 + v</code> becomes a <code>Tensor</code>.</p>
<p>What is the difference ... | 0 | 2016-07-24T19:47:39Z | 38,556,752 | <p>It's true that a Variable can be used any place a Tensor can, but the key differences between the two are that a Variable maintains its state across multiple calls to run() and a variable's value can be updated by backpropagation (it can also be saved, restored etc as per the documentation). </p>
<p>These differenc... | 2 | 2016-07-24T21:02:48Z | [
"python",
"tensorflow"
] |
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