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 |
|---|---|---|---|---|---|---|---|---|---|
Getting "TypeError: must be a string, not function" | 38,711,475 | <p>I'm using a microcontroller to control a lightbulb based on a user input time, and I'm running this function in a thread. I keep getting an error at the line <code>time.sleep(1)</code>:</p>
<blockquote>
<p>TypeError: must be a string, not function</p>
</blockquote>
<pre><code>def light():
while True:
... | 1 | 2016-08-02T03:49:46Z | 38,714,093 | <p>Problem was caused by me accidentally naming a variable and the function the same name. Changing the names fixed it. Thanks everyone for your help!</p>
| 0 | 2016-08-02T07:19:53Z | [
"python",
"multithreading"
] |
error when import panda the second time in mac python 2.7 | 38,711,504 | <p>I cannot use <code>import pandas as pd</code> the second time. At the beginning, I type this it worked very well. After I close the terminal, reopen it, and type it again, it is said 'pd' is not defined...</p>
<p>This happened both in Apple Python and Anaconda. I have tried deleting one and only use the other, but ... | -1 | 2016-08-02T03:54:32Z | 38,711,552 | <p>I am not sure I understand your question, but if this behavior is what you mean, this is normal behavior. I do not have pandas, but with any other library should be the same:</p>
<pre><code>>>> import requests as pd
>>> print pd.__version__
2.9.1
>>> exit()
Abel-Guzman-Sanchezs-MacBook-Ai... | 0 | 2016-08-02T04:01:00Z | [
"python"
] |
How to compute the probability of a value given a list of samples from a distribution in Python? | 38,711,541 | <p>Not sure if this belongs in statistics, but I am trying to use Python to achieve this. I essentially just have a list of integers:</p>
<pre><code>data = [300,244,543,1011,300,125,300 ... ]
</code></pre>
<p>And I would like to know the probability of a value occurring given this data.
I graphed histograms of the da... | 7 | 2016-08-02T03:58:48Z | 38,712,122 | <p>Here is one possible solution. You count the number of occurrences of each value in the original list. The future probability for a given value is its past rate of occurrence, which is simply the # of past occurrences divided by the length of the original list. In Python it's very simple:</p>
<p>x is the given l... | 3 | 2016-08-02T05:05:35Z | [
"python",
"matplotlib",
"scipy",
"probability",
"probability-density"
] |
How to compute the probability of a value given a list of samples from a distribution in Python? | 38,711,541 | <p>Not sure if this belongs in statistics, but I am trying to use Python to achieve this. I essentially just have a list of integers:</p>
<pre><code>data = [300,244,543,1011,300,125,300 ... ]
</code></pre>
<p>And I would like to know the probability of a value occurring given this data.
I graphed histograms of the da... | 7 | 2016-08-02T03:58:48Z | 38,712,171 | <p>Since you don't seem to have a specific distribution in mind, but you might have a lot of data samples, I suggest using a non-parametric density estimation method. One of the data types you describe (time in ms) is clearly continuous, and one method for non-parametric estimation of a probability density function (PD... | 5 | 2016-08-02T05:11:08Z | [
"python",
"matplotlib",
"scipy",
"probability",
"probability-density"
] |
How to compute the probability of a value given a list of samples from a distribution in Python? | 38,711,541 | <p>Not sure if this belongs in statistics, but I am trying to use Python to achieve this. I essentially just have a list of integers:</p>
<pre><code>data = [300,244,543,1011,300,125,300 ... ]
</code></pre>
<p>And I would like to know the probability of a value occurring given this data.
I graphed histograms of the da... | 7 | 2016-08-02T03:58:48Z | 38,712,299 | <p>OK I offer this as a starting point, but estimating densities is a very broad topic. For your case involving the amount of characters in a sequence, we can model this from a straight-forward frequentist perspective using <em>empirical probability</em>. Here, probability is essentially a generalization of the concept... | 3 | 2016-08-02T05:23:34Z | [
"python",
"matplotlib",
"scipy",
"probability",
"probability-density"
] |
Can somebody explain to how to do this last step in this tutorial | 38,711,542 | <p>I am attempting to add search functionality to my Django app by using haystack and elasticsearch, and after doing some searching on google I came across this tutorial:</p>
<p><a href="http://www.techstricks.com/django-haystack-and-elasticsearch-tutorial/" rel="nofollow">http://www.techstricks.com/django-haystack-an... | 1 | 2016-08-02T03:58:51Z | 38,714,730 | <p>There is work in progress to support to match <code>django urls</code> in haystack github issues. If found any errors when you are trying to use without url then please add <code>url</code>. Hopefully they will upgrade to the latest docs soon.</p>
| 0 | 2016-08-02T07:52:41Z | [
"python",
"django",
"elasticsearch",
"django-haystack"
] |
How to create an animation which cycles through a series of matpyplot.pyplot imshows | 38,711,548 | <p>I would like to convert the following code into an animation which cycles through the x values rather than just returning one x value like it currently does. </p>
<pre><code>import numpy as np
import matplotlib.pyplot as plt
def sliceplot(file_glob,xslice):
"""User inputs location of binary data file
and s... | 0 | 2016-08-02T04:00:04Z | 38,742,320 | <p>Is something like this what you like to do? My example below -- based on <a href="http://matplotlib.org/examples/animation/dynamic_image.html" rel="nofollow">this</a> example -- is using some dummy-image from the function <code>generate_image</code>, defined in the script. From what I understand of your question y... | 0 | 2016-08-03T11:29:54Z | [
"python",
"animation",
"matplotlib",
"imshow"
] |
Python Permission Error when reading | 38,711,568 | <pre><code>import os
import rarfile
file = input("Password List Directory: ")
rarFile = input("Rar File: ")
passwordList = open(os.path.dirname(file+'.txt'),"r")
</code></pre>
<p>with this code I am getting the error:</p>
<pre><code>Traceback (most recent call last):
File "C:\Users\Nick L\Desktop\Programming\... | 1 | 2016-08-02T04:03:12Z | 38,712,079 | <p>You're trying to open a <em>directory</em>, not a file, because of the call to <code>dirname</code> on this line:</p>
<pre class="lang-python3 prettyprint-override"><code>passwordList = open(os.path.dirname(file+'.txt'),"r")
</code></pre>
<p>To open the file instead of the directory containing it, you want somet... | 2 | 2016-08-02T05:00:39Z | [
"python",
"windows",
"python-3.x",
"permissions",
"file-permissions"
] |
Python Permission Error when reading | 38,711,568 | <pre><code>import os
import rarfile
file = input("Password List Directory: ")
rarFile = input("Rar File: ")
passwordList = open(os.path.dirname(file+'.txt'),"r")
</code></pre>
<p>with this code I am getting the error:</p>
<pre><code>Traceback (most recent call last):
File "C:\Users\Nick L\Desktop\Programming\... | 1 | 2016-08-02T04:03:12Z | 38,712,311 | <p>os.path.dirname() will return the Directory in which the file is present not the file path. For example if file.txt is in path= 'C:/Users/Desktop/file.txt' then os.path.dirname(path)wil return 'C:/Users/Desktop' as output, while the open() function expects a file path.
You can change the current working directory to... | 1 | 2016-08-02T05:24:31Z | [
"python",
"windows",
"python-3.x",
"permissions",
"file-permissions"
] |
Django JSon response format, nested fields | 38,711,624 | <p>I just made an ajax request to a DJango View, it give me back the data, but i don't know how to get only the fields that i want.</p>
<p>This is the part of my view:</p>
<pre><code>if request.method == 'POST':
txt_codigo_producto = request.POST.get('codigobarras_producto')
response_data = {}
... | 0 | 2016-08-02T04:10:26Z | 38,711,736 | <p>You are doing multiple encoding, i.e. first you using serializers.serialize and then json.dumps.</p>
<p>Use only json.dumps and content_type as json like this, without using serializers.</p>
<pre><code>response_dict = {'your_data_key': 'and your values'}
return HttpResponse(
json.dumps(response_dat... | 1 | 2016-08-02T04:23:22Z | [
"python",
"json",
"ajax",
"django"
] |
Django JSon response format, nested fields | 38,711,624 | <p>I just made an ajax request to a DJango View, it give me back the data, but i don't know how to get only the fields that i want.</p>
<p>This is the part of my view:</p>
<pre><code>if request.method == 'POST':
txt_codigo_producto = request.POST.get('codigobarras_producto')
response_data = {}
... | 0 | 2016-08-02T04:10:26Z | 38,713,020 | <p>Answer to your first question:-
You can change your queries as follows:</p>
<pre><code>resp_producto=Producto.objects.filter(codigobarras_producto=txt_codigo_producto).only('requiredField')
resp_inventario=InventarioProducto.objects.filter(producto_codigo_producto__in=resp_producto).only('requiredField').order_by('... | 0 | 2016-08-02T06:17:28Z | [
"python",
"json",
"ajax",
"django"
] |
Service inside docker container stops after some time | 38,711,658 | <p>I have deployed a rest service inside a docker container using uwsgi and nginx.
When I run this python flask rest service inside docker container, for first one hour service works fine but after sometime somehow nginx and rest service stops for some reason.</p>
<p>Has anyone faced similar issue?
Is there any know f... | 0 | 2016-08-02T04:14:49Z | 38,712,037 | <p>Consider doing a <code>docker ps -a</code> to get the stopped container's identifier.
<code>-a</code> here just means listing <strong>all</strong> of the containers you got on your machine.</p>
<p>Then do <code>docker inspect</code> and look for the <code>LogPath</code> attribute.
Open up the container's log file ... | 1 | 2016-08-02T04:56:10Z | [
"python",
"rest",
"nginx",
"docker"
] |
Regex find word including "-" | 38,711,686 | <p>I have the below regex (from this link: <a href="http://stackoverflow.com/questions/10380992/get-python-dictionary-from-string-containing-key-value-pairs">get python dictionary from string containing key value pairs</a>)</p>
<pre><code>r"\b(\w+)\s*:\s*([^:]*)(?=\s+\w+\s*:|$)"
</code></pre>
<p>Here is the explanati... | 0 | 2016-08-02T04:17:10Z | 38,711,726 | <p>You could try something such as this:</p>
<pre><code>r"\b([\w\-]+)\s*:\s*([^:]*)(?=\s+\w+\s*:|$)"
</code></pre>
<p>Note the <code>[\w\-]+</code>, which allows matching both a word character and a dash.</p>
<p>For readability in the future, you may also want to investigate <a href="https://docs.python.org/3/librar... | 1 | 2016-08-02T04:21:43Z | [
"python",
"regex"
] |
How to specify multiple auth in Python's requests module? | 38,711,778 | <p>I want to access a BASIC auth protected website via a proxy which requires NTLM authentication. I am using Python's requests module to access the website. How can I specify multiple authentication for a request in requests module? i.e. I need to provide NTLM credentials for proxy authentication and BASIC credentials... | 0 | 2016-08-02T04:29:40Z | 38,711,928 | <p>To use HTTP Basic Auth with your proxy, use the <code>http://user:password@host:port/</code> syntax:</p>
<p><code>proxies = {'http': 'http://user:pass@10.10.1.10:3128/'}</code></p>
| 0 | 2016-08-02T04:44:50Z | [
"python",
"authentication",
"python-requests"
] |
How to specify multiple auth in Python's requests module? | 38,711,778 | <p>I want to access a BASIC auth protected website via a proxy which requires NTLM authentication. I am using Python's requests module to access the website. How can I specify multiple authentication for a request in requests module? i.e. I need to provide NTLM credentials for proxy authentication and BASIC credentials... | 0 | 2016-08-02T04:29:40Z | 38,715,744 | <p>Try to add <code>HTTPBasicAuth</code> as follow:</p>
<pre><code>import requests
from requests_ntlm import HttpNtlmAuth
from requests.auth import HTTPBasicAuth
proxies = {'https': 'https://myproxy.com:8080', 'http': 'http://myproxy.com:8080'}
auth = (HttpNtlmAuth('ntlm_username','ntlm_secret'), HTTPBasicAuth('user_... | 0 | 2016-08-02T08:46:17Z | [
"python",
"authentication",
"python-requests"
] |
python multiprocessing pool timeout | 38,711,840 | <p>I want to use <a href="https://docs.python.org/3.4/library/multiprocessing.html#multiprocessing.pool.Pool" rel="nofollow">multiprocessing.Pool</a>, but multiprocessing.Pool can't abort a task after a timeout. I found <a href="http://stackoverflow.com/questions/29494001/how-can-i-abort-a-task-in-a-multiprocessing-poo... | 1 | 2016-08-02T04:36:17Z | 38,792,237 | <p>There is no implicit risk in stopping a running job, the OS will take care of correctly terminating the process.</p>
<p>If your job is writing on files, you might end up with lots of truncated files on your disk.</p>
<p>Some small issue might also occur if you write on DBs or if you are connected with some remote ... | 2 | 2016-08-05T14:55:02Z | [
"python",
"multithreading",
"multiprocessing",
"python-multithreading",
"python-multiprocessing"
] |
Segmentation fault writing xarray datset to netcdf or dataframe | 38,711,915 | <p>I get a segmentation fault working with a xarray dataset that was created from multiple grib2 files. The fault occurs when writing out to a netcdf as well as when writing to a dataframe. Any suggestions on what is going wrong are appreciated.</p>
<pre><code>files = os.listdir(download_dir)
</code></pre>
<p>Example... | 0 | 2016-08-02T04:43:47Z | 38,712,685 | <p><s>PyNIO doesn't play well with multithreading. Try adding <code>lock=True</code> to <code>open_mfdataset</code> (we should probably set this by default).</s></p>
<p>Try adding <code>proprocess=lambda x: x.load()</code> to the <code>open_mfdataset</code> call. This will ensure that each dataset is fully loaded into... | 0 | 2016-08-02T05:54:52Z | [
"python",
"python-xarray"
] |
How to compute correclty cross validation scores in scikit-learn? | 38,711,932 | <p>I am doing a classification task. Nevertheless, I am getting slightly different results:</p>
<pre><code>#First Approach
kf = KFold(n=len(y), n_folds=10, shuffle=True, random_state=False)
pipe= make_pipeline(SVC())
for train_index, test_index in kf:
X_train, X_test = X[train_index], X[test_index]
y_train, y_... | 2 | 2016-08-02T04:45:40Z | 38,714,998 | <p>For any classification task its always good to use StratifiedKFold cross validation split. In stratified KFold, you have equal number of samples from each class for your classification problem. </p>
<p><a href="http://i.stack.imgur.com/IhA9o.png" rel="nofollow"><img src="http://i.stack.imgur.com/IhA9o.png" alt="Str... | 2 | 2016-08-02T08:06:34Z | [
"python",
"python-3.x",
"machine-learning",
"scikit-learn"
] |
How to compute correclty cross validation scores in scikit-learn? | 38,711,932 | <p>I am doing a classification task. Nevertheless, I am getting slightly different results:</p>
<pre><code>#First Approach
kf = KFold(n=len(y), n_folds=10, shuffle=True, random_state=False)
pipe= make_pipeline(SVC())
for train_index, test_index in kf:
X_train, X_test = X[train_index], X[test_index]
y_train, y_... | 2 | 2016-08-02T04:45:40Z | 38,715,192 | <p>First, as explained in the <a href="http://scikit-learn.org/stable/modules/generated/sklearn.cross_validation.cross_val_score.html" rel="nofollow">documentation</a> and shown in some <a href="http://scikit-learn.org/stable/auto_examples/exercises/plot_cv_diabetes.html#example-exercises-plot-cv-diabetes-py" rel="nofo... | 2 | 2016-08-02T08:18:07Z | [
"python",
"python-3.x",
"machine-learning",
"scikit-learn"
] |
Is this behavior documented in Django's field validators for foreign keys? | 38,711,947 | <p>This is an example Python 2 code:</p>
<pre><code>from django.db import models
def my_validator(value):
assert isinstance(value, (int, long))
class Foo(models.Model):
name = models.CharField(...) # irrelevant here
class Bar(models.Model):
name = models.CharField(...) # irrelevant here
foo = models... | 1 | 2016-08-02T04:46:45Z | 38,712,244 | <p>Yes - this is implicitly referred to in the documentation for <a href="https://docs.djangoproject.com/en/1.9/ref/models/fields/#django.db.models.ForeignKey.to_field" rel="nofollow"><code>ForeignKey.to_field</code></a>:</p>
<blockquote>
<p>The field on the related object that the relation is to. By default, Django... | 3 | 2016-08-02T05:18:34Z | [
"python",
"django"
] |
Is this behavior documented in Django's field validators for foreign keys? | 38,711,947 | <p>This is an example Python 2 code:</p>
<pre><code>from django.db import models
def my_validator(value):
assert isinstance(value, (int, long))
class Foo(models.Model):
name = models.CharField(...) # irrelevant here
class Bar(models.Model):
name = models.CharField(...) # irrelevant here
foo = models... | 1 | 2016-08-02T04:46:45Z | 38,714,016 | <p>I'm not sure that @<strong>solarissmoke</strong> answer is relevant to the question. </p>
<p>IMO, <a href="https://docs.djangoproject.com/en/1.9/ref/models/instances/#validating-objects" rel="nofollow">validation</a> is not invoked at <code>objects.create</code>, if you want to validate your model before creating i... | 1 | 2016-08-02T07:16:30Z | [
"python",
"django"
] |
Function that depends on the row number | 38,711,966 | <p>In pandas, is it possible to reference the row number for a function. I am not talking about .iloc.</p>
<p>iloc takes a location i.e. a row number and returns a dataframe value.</p>
<p>I want to access the location number in the dataframe. </p>
<p>For instance, if the function is in the cell that is 3 rows down... | 2 | 2016-08-02T04:48:13Z | 38,712,603 | <p>Consider the dataframe <code>df</code></p>
<pre><code>df = pd.DataFrame([[1, 2], [3, 4]], ['a', 'b'], ['c', 'd'])
df
</code></pre>
<p><a href="http://i.stack.imgur.com/xwmXc.png" rel="nofollow"><img src="http://i.stack.imgur.com/xwmXc.png" alt="enter image description here"></a></p>
<p>And the row <code>row</cod... | 2 | 2016-08-02T05:48:26Z | [
"python",
"pandas",
"numbers",
"row"
] |
Function that depends on the row number | 38,711,966 | <p>In pandas, is it possible to reference the row number for a function. I am not talking about .iloc.</p>
<p>iloc takes a location i.e. a row number and returns a dataframe value.</p>
<p>I want to access the location number in the dataframe. </p>
<p>For instance, if the function is in the cell that is 3 rows down... | 2 | 2016-08-02T04:48:13Z | 38,721,746 | <p>Sorry I couldnt add a code sample but Im on my phone. piRSquared confirmed my fears when he said the info is lost. I guess ill have to do a loop everytime or add a column with numbers ( that will get scrambled if i sort them : / ).</p>
<p>Thanks everyone.</p>
| 0 | 2016-08-02T13:25:14Z | [
"python",
"pandas",
"numbers",
"row"
] |
Object indexing in python | 38,712,056 | <p>I have created the following objects in python</p>
<p>It creates an object of class arc and then creates another object network using the object arc</p>
<pre><code>class Arc:
# Creates an object of class arc
def __init__(self, tailNode = 0, headNode = 0, lowerBound = 0, upperBound = 0, cost = 0):
s... | 0 | 2016-08-02T04:58:25Z | 38,712,103 | <p>In order to support indexing, your Network class should have a <code>__getitem__()</code> method (<a href="http://docs.python.org/reference/datamodel.html#object.__getitem__" rel="nofollow">http://docs.python.org/reference/datamodel.html#object.<strong>getitem</strong></a>).</p>
| 1 | 2016-08-02T05:03:27Z | [
"python",
"indexing"
] |
Object indexing in python | 38,712,056 | <p>I have created the following objects in python</p>
<p>It creates an object of class arc and then creates another object network using the object arc</p>
<pre><code>class Arc:
# Creates an object of class arc
def __init__(self, tailNode = 0, headNode = 0, lowerBound = 0, upperBound = 0, cost = 0):
s... | 0 | 2016-08-02T04:58:25Z | 38,712,572 | <p>Assuming net[index] returns the arcList variable you can simply override your [] operator as such</p>
<pre><code>class Network:
def __getitem__(self,index):
return arcList[index]
</code></pre>
<p>Printing a class needs a method as well. This might help you
<a href="http://stackoverflow.com/questions/1... | 0 | 2016-08-02T05:45:14Z | [
"python",
"indexing"
] |
Appending a list | 38,712,204 | <p>I am trying to append the "result" variable into a new list called total_winnings but I get an error.</p>
<p>I managed to do it successfully for the total_stake but I get an error when I try use the same method for <code>total_winnings</code>.</p>
<p>I think it is because the "result" variable takes string input?<... | 1 | 2016-08-02T05:14:52Z | 38,712,321 | <p>The error you get is </p>
<p><code>TypeError: unsupported operand type(s) for +: 'int' and 'str'</code></p>
<p>The problem is that you are currently storing strings <code>"Win"</code> and <code>"Lose"</code> in <code>my_list[3]</code> whereas you mean to store <code>stake * odds</code>. When you do the function <c... | 0 | 2016-08-02T05:25:15Z | [
"python",
"list",
"append"
] |
Appending a list | 38,712,204 | <p>I am trying to append the "result" variable into a new list called total_winnings but I get an error.</p>
<p>I managed to do it successfully for the total_stake but I get an error when I try use the same method for <code>total_winnings</code>.</p>
<p>I think it is because the "result" variable takes string input?<... | 1 | 2016-08-02T05:14:52Z | 38,712,333 | <pre><code>result = (raw_input('Result: '))
</code></pre>
<p><code>result</code> is a <code>str</code> (a string).</p>
<pre><code>my_list=[selection,stake,odds,result,book]
...
for my_list in inputs:
total_winnings.append(my_list[3])
</code></pre>
<p><code>my_list[3]</code> is <code>result</code>, which is a <co... | 0 | 2016-08-02T05:26:28Z | [
"python",
"list",
"append"
] |
Appending a list | 38,712,204 | <p>I am trying to append the "result" variable into a new list called total_winnings but I get an error.</p>
<p>I managed to do it successfully for the total_stake but I get an error when I try use the same method for <code>total_winnings</code>.</p>
<p>I think it is because the "result" variable takes string input?<... | 1 | 2016-08-02T05:14:52Z | 38,712,347 | <p>I can see several issues with your code.</p>
<p>First, defining a function ("def looks_good(inputs)")
within a loop is not a good idea. Unless you're trying
to do something relatively tricky, function definitions
should be at the top level of your code, before
other stuff.</p>
<p>Second, the variable named "input... | 0 | 2016-08-02T05:28:08Z | [
"python",
"list",
"append"
] |
Appending a list | 38,712,204 | <p>I am trying to append the "result" variable into a new list called total_winnings but I get an error.</p>
<p>I managed to do it successfully for the total_stake but I get an error when I try use the same method for <code>total_winnings</code>.</p>
<p>I think it is because the "result" variable takes string input?<... | 1 | 2016-08-02T05:14:52Z | 38,712,419 | <p>my_list[3] contains either Win of Lose i.e a string value and summing over it won't work. You can do something like this</p>
<pre><code>result = (raw_input('Result: '))
result_val = stake*odds
if result == "Win":
print result_val
elif result == "Lose":
print 0
</code></pre>
<p>And while... | 0 | 2016-08-02T05:33:08Z | [
"python",
"list",
"append"
] |
How can I link my DetailView and my ListView together? | 38,712,209 | <p>I'm building a demo-website for a local jewellery store, and I'm trying to create a list of jewellery brands (ListView) and link each to its description (DetailView) in another page. I've spent a solid 15 hours trying to link my ListView and my DetailView together and I haven't fixed anything. These are the views I'... | 0 | 2016-08-02T05:15:23Z | 38,721,497 | <p>Your problem is in your url patterns. You have missed out the dollar from the end of your regex. That means that <code>/products/my-slug/</code> is matched by the regex for <code>BrandView</code> instead or <code>TextView</code>. Change it to:</p>
<pre><code>url(r'^products/$', BrandView.as_view(), name = 'products... | 0 | 2016-08-02T13:15:43Z | [
"python",
"django",
"listview",
"detailview"
] |
request.function in web2py | 38,712,360 | <p>What is <code>request.function</code> used for in <code>web2py</code> . I am a beginner to <code>web2y</code> and came across these lines in a tutorial </p>
<pre><code>if not request.function=='first' and not session.visitor_name:
redirect(URL('first'))
</code></pre>
<p>What is <code>request.function</code> us... | 0 | 2016-08-02T05:28:51Z | 38,716,012 | <p>Taken from the <a href="http://web2py.com/books/default/chapter/29/04/the-core#request" rel="nofollow">documentation.</a> </p>
<p><code>request.function: the name of the requested function.</code></p>
<p>So in your case. </p>
<pre><code>if not request.function=='first' and not session.visitor_name:
redirect(U... | 1 | 2016-08-02T08:58:48Z | [
"python",
"web2py"
] |
python map function with min argument and two lists | 38,712,468 | <p>Im having trouble figuring out why this map function is producing the output it's producing. The code is as follows:</p>
<pre><code> L1 = [1, 28, 36]
L2 = [2, 57, 9]
print map(min, L1, L2)
</code></pre>
<p>output is:
[1, 28, 9]</p>
<p>I understand it took the min values from the first list, but... | 2 | 2016-08-02T05:36:29Z | 38,712,496 | <p>The result is made up from</p>
<pre><code>[min(L1[0], L2[0]), min(L1[1], L2[1]), min(L1[2], L2[2])]
</code></pre>
<p>so <code>min</code> is being called on each pair of values to construct the new list</p>
| 4 | 2016-08-02T05:38:41Z | [
"python"
] |
python map function with min argument and two lists | 38,712,468 | <p>Im having trouble figuring out why this map function is producing the output it's producing. The code is as follows:</p>
<pre><code> L1 = [1, 28, 36]
L2 = [2, 57, 9]
print map(min, L1, L2)
</code></pre>
<p>output is:
[1, 28, 9]</p>
<p>I understand it took the min values from the first list, but... | 2 | 2016-08-02T05:36:29Z | 38,712,500 | <p><code>map(min, L1, L2)</code> means roughly this:</p>
<pre><code>[min(L1[0], L2[0]), min(L1[1], L2[1]), min(L1[2], L2[2])]
</code></pre>
<p>So the min of [1,2] (first element of each list) is 1, min of [28,57] is 28, and min of [36,9] is 9.</p>
<p>You probably wanted <code>map(min, [L1, L2])</code> instead.</p>
| 2 | 2016-08-02T05:39:09Z | [
"python"
] |
python map function with min argument and two lists | 38,712,468 | <p>Im having trouble figuring out why this map function is producing the output it's producing. The code is as follows:</p>
<pre><code> L1 = [1, 28, 36]
L2 = [2, 57, 9]
print map(min, L1, L2)
</code></pre>
<p>output is:
[1, 28, 9]</p>
<p>I understand it took the min values from the first list, but... | 2 | 2016-08-02T05:36:29Z | 38,712,513 | <p>The statement:</p>
<pre><code>map(min, L1, L2)
</code></pre>
<p>compares each elements of the two lists with <strong>the same index</strong>. </p>
<p>Thus,<br>
It performs:</p>
<pre><code>list = []
list.append(min(1,2)) #1
list.append(min(28,57)) #28
list.append(min(36,9)) #9
print list
</code></pre>
<p>leading... | 1 | 2016-08-02T05:40:04Z | [
"python"
] |
python map function with min argument and two lists | 38,712,468 | <p>Im having trouble figuring out why this map function is producing the output it's producing. The code is as follows:</p>
<pre><code> L1 = [1, 28, 36]
L2 = [2, 57, 9]
print map(min, L1, L2)
</code></pre>
<p>output is:
[1, 28, 9]</p>
<p>I understand it took the min values from the first list, but... | 2 | 2016-08-02T05:36:29Z | 38,712,650 | <p>Let's take a look at <a href="https://docs.python.org/3.5/library/functions.html?highlight=map#map" rel="nofollow">the document</a>:</p>
<blockquote>
<p><code>map(function, iterable, ...)</code></p>
<p>Return an iterator that applies function to every item of iterable,
yielding the results. If additional i... | 1 | 2016-08-02T05:51:47Z | [
"python"
] |
I am trying to figure out what these temporary variables mean | 38,712,567 | <pre><code>def genfibon(n): #fib sequence until n
a=1
b=1
for i in range n:
yield a
t=a
a=b
b=t+b
</code></pre>
<p>Can someone explain the t variable? It seems like <code>t=a</code> so then <code>a=b</code> and then <code>b=t</code> because <code>a=b</code> and <code>a=t</... | -1 | 2016-08-02T05:44:43Z | 38,712,604 | <p>Let's say a = 2 and b = 3.</p>
<pre><code>t = a # now t = 2
a = b # now a = 3, but t is unchanged
b = t + b # now b = 5
</code></pre>
<p>The key is that second part. <code>t = a</code> means <code>t</code> gets the same value as <code>a</code>. It does not mean that <code>t</code> and <code>a</code> are now both t... | 4 | 2016-08-02T05:48:27Z | [
"python"
] |
I am trying to figure out what these temporary variables mean | 38,712,567 | <pre><code>def genfibon(n): #fib sequence until n
a=1
b=1
for i in range n:
yield a
t=a
a=b
b=t+b
</code></pre>
<p>Can someone explain the t variable? It seems like <code>t=a</code> so then <code>a=b</code> and then <code>b=t</code> because <code>a=b</code> and <code>a=t</... | -1 | 2016-08-02T05:44:43Z | 38,712,633 | <p>Let us go statement by statement.</p>
<ol>
<li><code>t=a</code> means value of <code>a</code> is stored in <code>t</code>.</li>
<li><code>a=b</code> means value of <code>b</code> is stored in <code>a</code>. (Thus <code>a</code> now contains the next element in the series)</li>
<li><code>b=t+b</code> means value of... | 1 | 2016-08-02T05:50:01Z | [
"python"
] |
I am trying to figure out what these temporary variables mean | 38,712,567 | <pre><code>def genfibon(n): #fib sequence until n
a=1
b=1
for i in range n:
yield a
t=a
a=b
b=t+b
</code></pre>
<p>Can someone explain the t variable? It seems like <code>t=a</code> so then <code>a=b</code> and then <code>b=t</code> because <code>a=b</code> and <code>a=t</... | -1 | 2016-08-02T05:44:43Z | 38,712,653 | <p>It's called swapping of variables. how do you replace the values of variables? </p>
<p>as @smarx said, when <code>a = 2</code> and <code>b = 3</code>, how do you make it <code>a = 3</code> and <code>b = 2</code>?</p>
<p>when you do <code>a = 3</code>, the old value of a(2) is lost so you wont know what to set b wi... | 2 | 2016-08-02T05:52:27Z | [
"python"
] |
I am trying to figure out what these temporary variables mean | 38,712,567 | <pre><code>def genfibon(n): #fib sequence until n
a=1
b=1
for i in range n:
yield a
t=a
a=b
b=t+b
</code></pre>
<p>Can someone explain the t variable? It seems like <code>t=a</code> so then <code>a=b</code> and then <code>b=t</code> because <code>a=b</code> and <code>a=t</... | -1 | 2016-08-02T05:44:43Z | 38,712,993 | <p>In your first run </p>
<pre><code>yield a # will return 1
t = a # which is 1
a = b # which is 1
b = t + b # which is 2 as t = 1 and b = 1
</code></pre>
<p>In your 2nd run</p>
<pre><code>yield a # will return 1
t = a # which is 1
a = b # which is 2
b = t + b # which is 3 as t = 1 and b = 2
</code></pre>
... | 2 | 2016-08-02T06:15:20Z | [
"python"
] |
Capturing the order of occurrence of an ID in dataframe using Python | 38,712,595 | <p>I have a dataframe like this:</p>
<pre><code>ID Product
10001 A
10001 B
10001 C
10002 D
10002 A
10001 F
10001 X
10002 N
</code></pre>
<p>What I want in output is order of occurrence of a distinct ID in co... | 0 | 2016-08-02T05:47:47Z | 38,718,140 | <p>This builds groups of lines with the same ID, remembers the occurrences and add the group size at the end. </p>
<pre><code>def occCount(db):
occ = {}
last = db[0][0] if db != [] else None
group = []
res = []
for i, p in db:
if i not in occ.keys():
occ[i] = 0
# Add ite... | 1 | 2016-08-02T10:37:07Z | [
"python",
"data-manipulation"
] |
Writing list of tuples to a textfile and reading back into a list | 38,712,635 | <p>How do I write a list of tuples to a text file and read them back into the original list format?</p>
<p>My code gives:</p>
<pre><code>["(50, 'AAA')\n", "(40, 'BBB')\n", "(30, 'CCC')\n", "(20, 'DDD')\n", "(10, 'EEE')\n"]
</code></pre>
<p>My code:</p>
<pre><code>file = open("x.txt", "w")
default_scores = [(10, "EE... | 2 | 2016-08-02T05:50:09Z | 38,712,681 | <p>If your purpose is to read the lines without the newline characters, you can change that after reading the lines with a simple for loop:</p>
<pre><code>lines = file.readlines()
lines = [line[:-1] for line in lines]
</code></pre>
<p>Or of course, you could read the file and split lines using <code>str.splitlines</c... | 0 | 2016-08-02T05:54:41Z | [
"python",
"tuples",
"text-files"
] |
Writing list of tuples to a textfile and reading back into a list | 38,712,635 | <p>How do I write a list of tuples to a text file and read them back into the original list format?</p>
<p>My code gives:</p>
<pre><code>["(50, 'AAA')\n", "(40, 'BBB')\n", "(30, 'CCC')\n", "(20, 'DDD')\n", "(10, 'EEE')\n"]
</code></pre>
<p>My code:</p>
<pre><code>file = open("x.txt", "w")
default_scores = [(10, "EE... | 2 | 2016-08-02T05:50:09Z | 38,712,829 | <p>Just delete the '\n' character and append everything into a new list</p>
<pre><code>x = []
for i in lines:
i = i.replace("\n","")
x.append(i)
lines = x
</code></pre>
| 0 | 2016-08-02T06:03:39Z | [
"python",
"tuples",
"text-files"
] |
Writing list of tuples to a textfile and reading back into a list | 38,712,635 | <p>How do I write a list of tuples to a text file and read them back into the original list format?</p>
<p>My code gives:</p>
<pre><code>["(50, 'AAA')\n", "(40, 'BBB')\n", "(30, 'CCC')\n", "(20, 'DDD')\n", "(10, 'EEE')\n"]
</code></pre>
<p>My code:</p>
<pre><code>file = open("x.txt", "w")
default_scores = [(10, "EE... | 2 | 2016-08-02T05:50:09Z | 38,712,837 | <p>You can use a list comprehension to convert the list returned by file.readlines() into list of tuples -</p>
<p><strong>lines = [ast.literal_eval(line.strip()) for line in file.readlines()]</strong></p>
<p>I have used ast.literal_eval to convert string into tuple.
read more about ast.literal_eval <a href="https://d... | 2 | 2016-08-02T06:04:23Z | [
"python",
"tuples",
"text-files"
] |
Writing list of tuples to a textfile and reading back into a list | 38,712,635 | <p>How do I write a list of tuples to a text file and read them back into the original list format?</p>
<p>My code gives:</p>
<pre><code>["(50, 'AAA')\n", "(40, 'BBB')\n", "(30, 'CCC')\n", "(20, 'DDD')\n", "(10, 'EEE')\n"]
</code></pre>
<p>My code:</p>
<pre><code>file = open("x.txt", "w")
default_scores = [(10, "EE... | 2 | 2016-08-02T05:50:09Z | 38,712,844 | <p>If you want to write a data-structure to a file and get it back (without mixing it with other contents) you can use (de)serialization with <a href="https://docs.python.org/3/library/pickle.html#examples" rel="nofollow">pickle</a>:</p>
<pre><code>import pickle
pickle.dump(default_scores, open('tuple.dump', 'wb'))
re... | 4 | 2016-08-02T06:04:50Z | [
"python",
"tuples",
"text-files"
] |
Writing list of tuples to a textfile and reading back into a list | 38,712,635 | <p>How do I write a list of tuples to a text file and read them back into the original list format?</p>
<p>My code gives:</p>
<pre><code>["(50, 'AAA')\n", "(40, 'BBB')\n", "(30, 'CCC')\n", "(20, 'DDD')\n", "(10, 'EEE')\n"]
</code></pre>
<p>My code:</p>
<pre><code>file = open("x.txt", "w")
default_scores = [(10, "EE... | 2 | 2016-08-02T05:50:09Z | 38,712,853 | <p>It seems that <a href="https://docs.python.org/3/library/json.html" rel="nofollow">json</a> is suitable for the task :</p>
<pre><code>default_scores = [(10, "EEE"), (20, "DDD"), (30, "CCC"), (40, "BBB"), (50, "AAA")]
import json
with open('scores.txt','w') as ff:
json.dump(default_scores ,ff )
with open('score... | 1 | 2016-08-02T06:05:16Z | [
"python",
"tuples",
"text-files"
] |
Writing list of tuples to a textfile and reading back into a list | 38,712,635 | <p>How do I write a list of tuples to a text file and read them back into the original list format?</p>
<p>My code gives:</p>
<pre><code>["(50, 'AAA')\n", "(40, 'BBB')\n", "(30, 'CCC')\n", "(20, 'DDD')\n", "(10, 'EEE')\n"]
</code></pre>
<p>My code:</p>
<pre><code>file = open("x.txt", "w")
default_scores = [(10, "EE... | 2 | 2016-08-02T05:50:09Z | 38,712,943 | <p>If it's a file used only internally for your program to store an later retrieve the data you can use a simpler approach:</p>
<pre><code># Save data to disk
with open("mydata.dat", "w") as f:
f.write(repr(data))
...
# Read back from disk
with open("mydata.dat") as f:
data = eval(f.read())
</code></pre>
<p... | 1 | 2016-08-02T06:11:45Z | [
"python",
"tuples",
"text-files"
] |
Bind event to wx.button directy using wx.EVT_BUTTON? | 38,712,807 | <p>I read several wxPython books and am now quite familiar with binding a button with an event. Such as in a wx.Frame's __init__ method, I wrote:</p>
<pre><code>self.btn = wx.Button(self, 2, "click me")
self.btn.bind(wx.EVT_BUTTON, self.onclick)
</code></pre>
<p>where <code>onclick</code> is something need to do when... | 0 | 2016-08-02T06:02:18Z | 38,714,084 | <p>Paul's comment is correct, but here is some more information:</p>
<p>To answer #1, no it will not be garbage collected. The parent window owns the C++ part of the button object, which in turn has a reference to the Python part of the button object. So the Python object will continue to exist as long as the C++ obje... | 1 | 2016-08-02T07:19:29Z | [
"python",
"wxpython"
] |
Incomplete Gamma function in scipy | 38,713,199 | <p>I would like to compute what wolfram alpha calls the incomplete gamma function <a href="http://www.wolframalpha.com/input/?i=Gamma%5B0,%200.1%5D" rel="nofollow">(see here)</a>:</p>
<pre><code>`gamma[0, 0.1]`
</code></pre>
<p>The wolfram alpha output is <code>1.822</code>. The only thing <code>scipy</code> gives me... | 1 | 2016-08-02T06:29:44Z | 38,715,054 | <p>According to <a href="http://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.special.gammainc.html" rel="nofollow">http://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.special.gammainc.html</a>, the first argument must be positive, whereas you have zero; that's why you're getting NaN.</p>
<p>T... | 2 | 2016-08-02T08:09:28Z | [
"python",
"scipy"
] |
How do I turn a dataframe into a series of lists? | 38,713,200 | <p>I have had to do this several times and I'm always frustrated. I have a dataframe:</p>
<pre><code>df = pd.DataFrame([[1, 2, 3, 4], [5, 6, 7, 8]], ['a', 'b'], ['A', 'B', 'C', 'D'])
print df
A B C D
a 1 2 3 4
b 5 6 7 8
</code></pre>
<p>I want to turn <code>df</code> into:</p>
<pre><code>pd.Series([... | 17 | 2016-08-02T06:29:48Z | 38,713,212 | <p>pandas tries really hard to make making dataframes convenient. As such, it interprets lists and arrays as things you'd want to split into columns. I'm not going to complain, this is almost always helpful.</p>
<p>I've done this one of two ways.</p>
<p><strong><em>Option 1</em></strong>:</p>
<pre><code># Only wor... | 7 | 2016-08-02T06:30:33Z | [
"python",
"list",
"pandas",
"dataframe"
] |
How do I turn a dataframe into a series of lists? | 38,713,200 | <p>I have had to do this several times and I'm always frustrated. I have a dataframe:</p>
<pre><code>df = pd.DataFrame([[1, 2, 3, 4], [5, 6, 7, 8]], ['a', 'b'], ['A', 'B', 'C', 'D'])
print df
A B C D
a 1 2 3 4
b 5 6 7 8
</code></pre>
<p>I want to turn <code>df</code> into:</p>
<pre><code>pd.Series([... | 17 | 2016-08-02T06:29:48Z | 38,713,387 | <p>You can first convert <code>DataFrame</code> to <code>numpy array</code> by <a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.values.html"><code>values</code></a>, then convert to list and last create new <code>Series</code> with index from <code>df</code> if need faster solution:</p>
... | 11 | 2016-08-02T06:41:55Z | [
"python",
"list",
"pandas",
"dataframe"
] |
How do I turn a dataframe into a series of lists? | 38,713,200 | <p>I have had to do this several times and I'm always frustrated. I have a dataframe:</p>
<pre><code>df = pd.DataFrame([[1, 2, 3, 4], [5, 6, 7, 8]], ['a', 'b'], ['A', 'B', 'C', 'D'])
print df
A B C D
a 1 2 3 4
b 5 6 7 8
</code></pre>
<p>I want to turn <code>df</code> into:</p>
<pre><code>pd.Series([... | 17 | 2016-08-02T06:29:48Z | 38,715,865 | <p>Dataframe to list conversion</p>
<pre><code>List_name =df_name.values.tolist()
</code></pre>
| 0 | 2016-08-02T08:51:37Z | [
"python",
"list",
"pandas",
"dataframe"
] |
customised loss function in keras using theano function | 38,713,407 | <p>I'd like to use my own binary_crossentropy instead of using the one that comes with Keras library. Here is my custom function:</p>
<pre><code> import theano
from keras import backend as K
def elementwise_multiply(a, b): # a and b are tensors
c = a * b
return theano.function([a, b], c)
... | 0 | 2016-08-02T06:43:08Z | 38,732,069 | <p>I found the problem. I had to multiply the return value by "-1" as I'm using stochastic gradient decedent (sgd) as optimiser and not stochastic gradient ascent!</p>
<p>Here is the code and it works like a charm:</p>
<pre><code>import theano
from keras import backend as K
def custom_objective(y_true, y_pred):
... | 0 | 2016-08-02T23:33:24Z | [
"python",
"theano",
"keras"
] |
Python/Numpy: Conditional simulation from a multivatiate distribution | 38,713,746 | <p>Using numpy I can simulate unconditionally from a multivariate normal distribution by</p>
<pre><code>mean = [0, 0]
cov = [[1, 0], [0, 100]] # diagonal covariance
x, y = np.random.multivariate_normal(mean, cov, 5000).T
</code></pre>
<p>How do I simulate y from the same distribution, given that I have 5000 realizat... | 2 | 2016-08-02T07:02:48Z | 38,718,317 | <p>Looking up in Eaton, Morris L. (1983). Multivariate Statistics: a Vector Space Approach, I gathered following example solution for a 4 vaiable system, with 2 dependent variables (the first two) and 2 independent variables (the last two)</p>
<pre><code>import numpy as np
mean = np.array([1, 2, 3, 4])
cov = np.array... | 1 | 2016-08-02T10:46:21Z | [
"python",
"numpy",
"simulation"
] |
Eclipse Raspberry Pi 3 remote debugging ImportError: No module named 'bluetooth' | 38,713,816 | <p>I am trying to do a Bluetooth scan on my Raspberry pi 3. I am using eclipse remote debugging for coding. Python version is 3.4</p>
<pre><code>import sys
sys.path.append(r'C:\Users\SachithW\Downloads\eclipse-java-mars-2-win32-x86_64\eclipse\plugins\org.python.pydev_5.1.2.201606231256\pysrc')
import pydevd
pydevd.s... | -1 | 2016-08-02T07:06:10Z | 38,715,831 | <p>Did you do this:</p>
<pre><code>sudo apt-get install python-bluez
</code></pre>
<p>I have also seen this in tutorials:</p>
<pre><code>pip install pybluez
</code></pre>
| 0 | 2016-08-02T08:49:46Z | [
"python",
"eclipse",
"bluetooth",
"raspberry-pi",
"remote-debugging"
] |
Cython: invalid operand types | 38,713,913 | <p>I have a C++ class implementation which I want to expose to Python with Cython.
The class interface is something like this (each operator's implementation involves some private attributes so they cannot be inline implementations):</p>
<pre><code>class Quantity {
private:
// Some implementation --
public:
ex... | 1 | 2016-08-02T07:12:00Z | 38,714,675 | <p>Multiple <code>__cinit__</code> is not allowed as far as I remember</p>
<pre><code>def __cinit__(PyQuantity self, ... ):
self._thisptr = new Quantity(...)
def __cinit__(PyQuantity self, Quantity ot):
self._thisptr = new Quantity(ot)
</code></pre>
<p>Arguments to <code>__cinit__</code> should be python obj... | 0 | 2016-08-02T07:49:46Z | [
"python",
"c++",
"cython"
] |
Cython: invalid operand types | 38,713,913 | <p>I have a C++ class implementation which I want to expose to Python with Cython.
The class interface is something like this (each operator's implementation involves some private attributes so they cannot be inline implementations):</p>
<pre><code>class Quantity {
private:
// Some implementation --
public:
ex... | 1 | 2016-08-02T07:12:00Z | 38,721,939 | <p>A slightly modified version of the accepted answer actually works.
The problem with that was += is not implemented (for a reason) so
<code>nobj._thisptr[0] = self._thisptr[0] + other._thisptr[0]</code> was used, but this causes segmentation errors - obviously, since the resulting Quantity object is not heap alo... | 0 | 2016-08-02T13:32:30Z | [
"python",
"c++",
"cython"
] |
django time checker database | 38,713,931 | <p>I am trying to create a thread function that allow me to check a database field in order to see if the time.now() is bigger than the one recorded in the database(postgresql); the problem is that the view.py where I am calling this, is blocked by this thread, this is my actual code:</p>
<p>PD: expire_pet is a text f... | 0 | 2016-08-02T07:13:04Z | 38,714,792 | <p>It works, the problem was that I have been calling the run in the wrong place, thanks</p>
| 0 | 2016-08-02T07:56:22Z | [
"python",
"django",
"postgresql",
"python-multithreading"
] |
Python 3 - IndexError: list index out of range when trying to find determinant of a matrix | 38,713,967 | <p>I am trying to find determinant with a nested list representing a two-dimensional matrix. But it is infinitely calling the getMinor() function and continuously deleting from the same list, which should not happend because I am creating new list every time. Below is the code. Also all the functions are defined in a c... | 0 | 2016-08-02T07:14:36Z | 38,715,359 | <p>You have two problems. One is alluded to by user2357112 who unfortunately didn't bother to explain. When you use the expression x[:] you get a shallow copy of the list x. Often there is no practical difference between deep and shallow copies; for example if x contains numbers or strings. But in your case the ele... | 1 | 2016-08-02T08:26:01Z | [
"python",
"python-3.x",
"math",
"matrix"
] |
Groupby, pivot and concatenate in Pandas, breaking by date? | 38,714,057 | <p>I have a dataframe which looks like this:</p>
<pre><code>df = pd.DataFrame([
[123, 'abc', '121'],
[123, 'abc', '121'],
[456, 'def', '121'],
[123, 'abc', '122'],
[123, 'abc', '122'],
[456, 'def', '145'],
[456, 'def', '145'],
[456, 'def', '121'],
], ... | 0 | 2016-08-02T07:18:24Z | 38,714,277 | <p>Try:</p>
<pre><code>def tweak(df):
return df.reset_index().name
df.set_index('userid').groupby(level=0).apply(tweak)
</code></pre>
<hr>
<h3>Demonstration</h3>
<pre><code>df = pd.DataFrame([[1, 'a'], [1, 'c'], [1, 'c'], [1, 'd'], [1, 'e'],
[1, 'a'], [1, 'c'], [1, 'c'], [1, 'd'], [1, 'e'],
... | 0 | 2016-08-02T07:28:47Z | [
"python",
"pandas"
] |
Pyhon:Generate a variable inside a for loop | 38,714,076 | <p>I am trying to generate and save an image with a new name for each loop.Is this possible in python with a for loop?Or should I try a different approach?</p>
<pre><code>For i in range(x,y)
i=str(i)
p= img(i).save(s+i+j,)
i=int('i')
i=i+1
</code></pre>
| 2 | 2016-08-02T07:19:12Z | 38,714,149 | <pre><code>from PIL import Image
images = [...]
# create some images
for i, image in enumerate(images):
image.save('image_%03d.png' % i)
</code></pre>
| 0 | 2016-08-02T07:22:09Z | [
"python",
"for-loop",
"image-processing",
"image-generation"
] |
How to detect 01-Jan-01 dates in pandas from csv | 38,714,207 | <p>I have the following csv, saved as <code>test.txt</code>:</p>
<pre><code>title, arbitrarydate, value
hello, 01-Jan-01, 314159
</code></pre>
<p>running the following code</p>
<pre><code>dataframe = pd.read_csv('pandatestcsv.txt', parse_dates = True)
print dataframe.dtypes
</code></pre>
<p>gives this output </p>
... | 0 | 2016-08-02T07:24:53Z | 38,714,234 | <p>For me works:</p>
<pre><code>import pandas as pd
import io
temp=u"""title,arbitrarydate,value
hello,01-Jan-01,314159"""
#after testing replace io.StringIO(temp) to filename
df = pd.read_csv(io.StringIO(temp), parse_dates=['arbitrarydate'])
print (df)
title arbitrarydate value
0 hello 2001-01-01 314159
p... | 0 | 2016-08-02T07:26:15Z | [
"python",
"csv",
"pandas"
] |
Pandas DataFrame grouping to generate numerical multi-index | 38,714,254 | <p>I would like to apply a group by operation to a Pandas DataFrame without performing any aggregation. Instead, I just want the hierarchical structure to be reflected in the MultiIndex.</p>
<pre><code>import pandas as pd
def multi_index_group_by(df, columns):
# TODO: How to write this? (Hard-coded to give the de... | 3 | 2016-08-02T07:27:37Z | 38,716,324 | <p>This code does what you want:</p>
<pre><code>index_columns = []
replace_values = {}
index_columns += ["b"]
replace_values.update({'b0':0, 'b1':1})
df[['idx_{}'.format(i) for i in index_columns]] = df[index_columns].replace(replace_values)
print(df.set_index(['idx_{}'.format(i) for i in index_columns], drop=True))... | 1 | 2016-08-02T09:13:28Z | [
"python",
"pandas",
"grouping"
] |
Pandas DataFrame grouping to generate numerical multi-index | 38,714,254 | <p>I would like to apply a group by operation to a Pandas DataFrame without performing any aggregation. Instead, I just want the hierarchical structure to be reflected in the MultiIndex.</p>
<pre><code>import pandas as pd
def multi_index_group_by(df, columns):
# TODO: How to write this? (Hard-coded to give the de... | 3 | 2016-08-02T07:27:37Z | 38,717,841 | <p>if you are willing to use the <a href="http://scikit-learn.org/stable/" rel="nofollow">sklearn</a> package you could use the <a href="http://scikit-learn.org/stable/modules/generated/sklearn.preprocessing.LabelEncoder.html" rel="nofollow">LabelEncoder</a>:</p>
<pre><code>from sklearn.preprocessing import LabelEncod... | 2 | 2016-08-02T10:24:32Z | [
"python",
"pandas",
"grouping"
] |
How do I trim a .fits image and keep world coordinates for plotting in astropy Python? | 38,714,293 | <p>This issue has been plaguing me for some time. I'm trying to handle some large amount of data that is in the form of a .fits file (on the order of 11000x9000 pixels). What I need to do is create a 'zoomed in' RA/Dec coordinate plot (ideally using astropy.wcs) for many objects on the sky with contours from one fits f... | 2 | 2016-08-02T07:29:38Z | 38,716,117 | <p>The good news is: You can simply slice your <code>astropy.WCS</code> as well which makes your task relativly trivial:</p>
<pre><code>...
wmapcut = wmap[250:650, 250:650] # sliced here
datacut = data[250:650, 250:650]
ax2 = fig.add_subplot(122, projection=wmapcut) # use sliced wcs as projection
ax2.imshow(datacut, ... | 4 | 2016-08-02T09:03:07Z | [
"python",
"python-2.7",
"astronomy",
"astropy"
] |
How to Assign Values to Tensorflow SubTensor? | 38,714,440 | <p>I have a tensorfow constant</p>
<pre><code>x = tf.zeros((N * (T - n + 1), n, D))
</code></pre>
<p>I have a tensorflow placeholder:</p>
<pre><code>X = tf.placeholder(tf.float32, shape=(None, None, n_in))
</code></pre>
<p>And I want to assign some valued of X to x, in numpy I would do:</p>
<pre><code>x[N * i:N * ... | 0 | 2016-08-02T07:37:02Z | 38,715,198 | <p>I'd assign array chunks with <code>numpy</code> and then converting back to <code>tensorflow</code>:</p>
<pre><code>with tf.Session() as sess:
#some tf operations here
# ...
x_np = np.array(sess.run(x))
X_np = np.array(sess.run(X))
#assign with numpy:
x_np[N * i:N * (i + 1), :, :... | 1 | 2016-08-02T08:18:32Z | [
"python",
"tensorflow",
"subset",
"variable-assignment"
] |
Monitor new appended rows and create a ; separated file for each row | 38,714,470 | <p>I have a csv file on a linux server that has new rows appended in random times (can be every 1 sec and can be 2 hours with no new rows). The file looks as follows:</p>
<pre><code>KEY PREDICTION FIRST NAME LAST NAME
aaaaaa 0 john doe
bbbbbb 1 jane doe
cccccc 1 michael michael... | -4 | 2016-08-02T07:39:24Z | 38,714,901 | <p>I would recommend looking at <a href="http://www.dabeaz.com/generators/" rel="nofollow">David's generator tricks from python</a> . A sample program that would achieve your objective would be something like:</p>
<pre><code>import time
import csv
def follow(thefile):
thefile.seek(0,2)
while True:
line... | 0 | 2016-08-02T08:01:24Z | [
"python",
"python-2.7",
"pandas"
] |
tensorflow - memory leak? | 38,714,557 | <p>I'm running tensorflow 0.10.0rc0 on OSX 10.9.5 Mavericks.</p>
<p>There are approximately 25k training examples, 250 features (x), 15 classes (y_) and the predict (y) is a single-hidden-layer NN perceptron.</p>
<p>The following snippet of a simple training loop seems to have a massive memory leak (of order 10s of G... | 1 | 2016-08-02T07:44:00Z | 38,716,814 | <ol>
<li>Its unnecessary to run <code>sess.run(correct_prediction)</code> -- it's a tensorflow graph variable on which the <code>accuracy</code> variable is dependant. This implies that it will be evaluated during the call to <code>sess.run(accuracy)</code> in any case.</li>
<li>You're probably modifying your graph by ... | 1 | 2016-08-02T09:35:58Z | [
"python",
"memory-leaks",
"tensorflow"
] |
How To Avoid Logic In Template? | 38,714,607 | <p>I'm trying to develop a forum application.</p>
<p>I'm trying to display the latest topic that's been posted in each category on a listing page. However, I realised after adding more than one category that I need a separate query for each single category or it just shows the newest topic overall.</p>
<p>I'm just no... | 0 | 2016-08-02T07:46:25Z | 38,717,708 | <p>You can create a custom template tag that returns the latest post for each category.</p>
<p>Something like this:</p>
<pre><code># views.py
def index(req):
categories = ForumCategory.objects.all()
return render(req, "forum/category_listing.html", {'categories': categories})
# templatetags/category_tags.py
... | 0 | 2016-08-02T10:17:40Z | [
"python",
"django"
] |
Python string literals - including single quote as well as double quotes in string | 38,714,701 | <p>I want to join this series of strings:</p>
<pre><code>my_str='"hello!"' + " it's" + ' there'
</code></pre>
<p>Want the result to be: </p>
<pre><code>my_str
Out[65]: '"hello!" it's there'
</code></pre>
<p>But I get:</p>
<pre><code>my_str
Out[65]: '"hello!" it\'s there'
</code></pre>
<p>I have tried a few iterat... | 1 | 2016-08-02T07:50:56Z | 38,714,774 | <p>The result is correct. Single quotes have to be escaped in single quoted strings. The same for double quotes.</p>
<p>If you try <code>print</code> the result, you'll see that it's as you expected.</p>
<pre><code>>>> print(my_str)
"hello!" it's there
</code></pre>
| 3 | 2016-08-02T07:54:48Z | [
"python"
] |
Python string literals - including single quote as well as double quotes in string | 38,714,701 | <p>I want to join this series of strings:</p>
<pre><code>my_str='"hello!"' + " it's" + ' there'
</code></pre>
<p>Want the result to be: </p>
<pre><code>my_str
Out[65]: '"hello!" it's there'
</code></pre>
<p>But I get:</p>
<pre><code>my_str
Out[65]: '"hello!" it\'s there'
</code></pre>
<p>I have tried a few iterat... | 1 | 2016-08-02T07:50:56Z | 38,715,024 | <p>if you use <code>print</code> command you will see as you want...</p>
<pre><code>>>> my_str='"hello!"' + " it's" + ' there'
>>> my_str
'"hello!" it\'s there' #Count printed characters. You will count 22
>>> print my_str
"hello!" it's there
#Now count characters. 19
>>> len(my_str... | 2 | 2016-08-02T08:08:12Z | [
"python"
] |
Python string literals - including single quote as well as double quotes in string | 38,714,701 | <p>I want to join this series of strings:</p>
<pre><code>my_str='"hello!"' + " it's" + ' there'
</code></pre>
<p>Want the result to be: </p>
<pre><code>my_str
Out[65]: '"hello!" it's there'
</code></pre>
<p>But I get:</p>
<pre><code>my_str
Out[65]: '"hello!" it\'s there'
</code></pre>
<p>I have tried a few iterat... | 1 | 2016-08-02T07:50:56Z | 38,715,205 | <p><code>print my_str</code> will print your string as</p>
<p><code>'"hello!" it's there'</code></p>
<p>You can also do that stuff in another way using <code>my_str.decode('ascii')</code></p>
<pre><code>new_str = my_str.decode('ascii')
print new_str
</code></pre>
<p>It will print the string as:</p>
<p><code>"hello... | 0 | 2016-08-02T08:18:57Z | [
"python"
] |
OpenERP/Odoo - Quote inside a string is not working - cr.execute(SQL) | 38,714,803 | <p>In OpenERP 7 , I am using a cr.execute to execute a SQL Request</p>
<pre><code>cr.execute('select distinct(value) from ir_translation where name = \'product.bat3,name\' and src = \''+ str(res_bat[j][0].encode('utf-8'))+'\' and res_id = '+ str(res_bat[j][1])+' and lang = \''+ str(line2.partner_id.lang)+'\'')
</code>... | 1 | 2016-08-02T07:56:44Z | 38,718,459 | <p>you must not perform the substitutions yourself in a SQL query as this makes your code vulnerable to <a href="https://en.wikipedia.org/wiki/SQL_injection" rel="nofollow">SQL injections</a>. </p>
<p>The correct version is:</p>
<pre><code>cr.execute(
'select distinct(value) from ir_translation '
'where name ... | 1 | 2016-08-02T10:53:38Z | [
"python",
"sql",
"openerp"
] |
Django database to postgresql | 38,714,806 | <p>There are around 5000 companies and each company has around 4500 prices, that makes a total of around 22,000,000 prices.</p>
<p>Now a while ago, I wrote a code that stored this data in a format like this-</p>
<pre><code>class Endday(models.Model):
company = models.TextField(null=True)
eop = models.CommaSeparat... | 0 | 2016-08-02T07:56:56Z | 38,716,608 | <p>I think you can create a separate model for <code>Company</code>and <code>Price</code> something like this:</p>
<pre><code>class Company(models.Model):
name = models.CharField(max_length=20)
class Price(models.Model):
company = models.ForeignKey(Company, related_name='prices')
price = models.FloatField... | 0 | 2016-08-02T09:27:12Z | [
"python",
"mysql",
"django",
"database",
"postgresql"
] |
Alternating Least Square error in pyspark | 38,714,937 | <p>I've been trying to train model based on ALS using pyspark.ALS.recommendation. Code : </p>
<pre><code>from pyspark.ALS.recommendation import ALS
model=ALS.train(trainingset,rank=8,seed=0,iterations=10,lambda_=0.1)
</code></pre>
<p>But I am getting this following error : </p>
<pre><code>invalid literal for int() ... | 1 | 2016-08-02T08:03:18Z | 38,715,386 | <p>Well, the error message means you are passing some 'userId' <strong>text where a number is expected</strong>. Without further information (like full error message or the stacktrace) is hard to say what exactly the problem is.</p>
<p>EDIT: As mentioned in the comments, it turns out you have the 'header' row from CSV... | 0 | 2016-08-02T08:27:15Z | [
"python",
"pyspark"
] |
Understanding Keras LSTMs | 38,714,959 | <p>I am trying to reconcile my understand of LSTMs and pointed out here: <a href="http://colah.github.io/posts/2015-08-Understanding-LSTMs/">http://colah.github.io/posts/2015-08-Understanding-LSTMs/</a> with the LSTM implemented in Keras. I am following the blog written <a href="http://machinelearningmastery.com/time-s... | 15 | 2016-08-02T08:04:13Z | 38,737,941 | <p>First of all, you choose great tutorials(<a href="http://colah.github.io/posts/2015-08-Understanding-LSTMs/">1</a>,<a href="http://karpathy.github.io/2015/05/21/rnn-effectiveness/">2</a>) to start.</p>
<p><strong>What Time-step means</strong>: <code>Time-steps==3</code> in X.shape (Describing data shape) means ther... | 7 | 2016-08-03T08:09:59Z | [
"python",
"deep-learning",
"keras",
"lstm"
] |
how can i update an alfresco share site? | 38,714,974 | <p>I am trying to update a website (just change its name) I have created with the Share script in Alfresco, but I am getting a <code>401</code> response. I'm sure my login and password are correct.</p>
<p>Code: </p>
<pre><code>s = requests.Session()
data = {'username':"admin", 'password':"admin"}
url = "http://127.0.... | 0 | 2016-08-02T08:05:01Z | 38,719,300 | <p>This is because you are using different contexts to make your queries.</p>
<p>The Alfresco stack is made of multiples parts :</p>
<ul>
<li>alfresco.war</li>
<li>share.war</li>
<li>solr.war</li>
</ul>
<p>If we forget the solr part and focus on your problem, you have :</p>
<ul>
<li>a <strong>content repository</st... | 2 | 2016-08-02T11:33:49Z | [
"python",
"alfresco",
"alfresco-webscripts"
] |
Run multiple unittest tes tfiles at once | 38,715,036 | <p>In my project I created a unittest test file for each Python file. For example, I have file <code>component.py</code> and its accompanying <code>test_component.py</code>. Similarly for <code>path.py</code> and <code>test_path.py</code>, etc.</p>
<p>However, since these files depend on each other it is possible that... | 0 | 2016-08-02T08:08:49Z | 38,727,892 | <p>I would recommend using <a href="http://docs.pytest.org/en/latest/" rel="nofollow">Pytest</a>. </p>
<p>Another alternative is to have a separate file that calls tests or instantiates classes from each test file. Based on the returns it calls the next test. </p>
<p>You also might have a need store information in a ... | 1 | 2016-08-02T18:25:32Z | [
"python",
"unit-testing",
"testing",
"pycharm"
] |
Run multiple unittest tes tfiles at once | 38,715,036 | <p>In my project I created a unittest test file for each Python file. For example, I have file <code>component.py</code> and its accompanying <code>test_component.py</code>. Similarly for <code>path.py</code> and <code>test_path.py</code>, etc.</p>
<p>However, since these files depend on each other it is possible that... | 0 | 2016-08-02T08:08:49Z | 38,768,038 | <p>It's possible to run all tests located in some folder.</p>
<p>Go to <code>Run - Edit Configurations</code>, select or create run configuration for tests and specify path to folder.</p>
<p><a href="http://i.stack.imgur.com/2aQja.png" rel="nofollow"><img src="http://i.stack.imgur.com/2aQja.png" alt="enter image desc... | 1 | 2016-08-04T12:58:26Z | [
"python",
"unit-testing",
"testing",
"pycharm"
] |
Converting Disassembled Python Bytecode back into Source Code | 38,715,149 | <p>This is not traditional bytecode but rather disassembled bytecode, no compiler is built to compile this code.</p>
<p>I have been given an encoder to reverse engineer. This encoder however was disassembled and put into human-readable form. I have so-far rewritten the majority of the code back into source code but ha... | 0 | 2016-08-02T08:15:39Z | 38,715,958 | <p>You really want to automate this rather than do this by hand; there are some tools like <code>decompyle</code> and <code>uncompyle</code> that can produce Python source code from bytecode.</p>
<p>Your bytecode from the code objects are somewhat jumbled up, and we are missing the <code>co_argcount</code> and <code>c... | 2 | 2016-08-02T08:55:34Z | [
"python",
"reverse-engineering",
"bytecode"
] |
Scikit Learn - Extract word tokens from a string delimiter using CountVectorizer | 38,715,212 | <p>I have list of strings. If any string contains the <em>'#'</em> character then I want to extract the first part of the string and get the frequency count of word tokens from this part of string only. i.e
if the string is <em>"first question # on stackoverflow"</em>
expected tokens are <em>"first","question"</em></p>... | 4 | 2016-08-02T08:19:13Z | 38,716,512 | <p>The problem lays with your tokenizer, you've split the string into the bits you want to keep and the bits you don't want to keep, but you've not split the string into words.
Try using the tokenizer below</p>
<pre><code>class MyTokenizer(object):
def __call__(self,s):
if(s.find('#')==-1):
ret... | 2 | 2016-08-02T09:21:50Z | [
"python",
"machine-learning",
"scikit-learn"
] |
Scikit Learn - Extract word tokens from a string delimiter using CountVectorizer | 38,715,212 | <p>I have list of strings. If any string contains the <em>'#'</em> character then I want to extract the first part of the string and get the frequency count of word tokens from this part of string only. i.e
if the string is <em>"first question # on stackoverflow"</em>
expected tokens are <em>"first","question"</em></p>... | 4 | 2016-08-02T08:19:13Z | 38,716,682 | <p>You could split on your separator(<code>#</code>) at most once and take the first part of the split.</p>
<pre><code>from sklearn.feature_extraction.text import CountVectorizer
def tokenize(text):
return([text.split('#', 1)[0].strip()])
text = ["first ques # on stackoverflow", "please help"]
vec = CountVector... | 2 | 2016-08-02T09:30:16Z | [
"python",
"machine-learning",
"scikit-learn"
] |
Scikit Learn - Extract word tokens from a string delimiter using CountVectorizer | 38,715,212 | <p>I have list of strings. If any string contains the <em>'#'</em> character then I want to extract the first part of the string and get the frequency count of word tokens from this part of string only. i.e
if the string is <em>"first question # on stackoverflow"</em>
expected tokens are <em>"first","question"</em></p>... | 4 | 2016-08-02T08:19:13Z | 38,717,160 | <pre><code> s.split('#',1)[0]
</code></pre>
<p><code>#</code> is your result. you dont need check that "#" is exist or not.</p>
| 0 | 2016-08-02T09:51:46Z | [
"python",
"machine-learning",
"scikit-learn"
] |
Multiply each column from 2D array with each column from another 2D array | 38,715,287 | <p>I have two Numpy arrays <code>x</code> with shape <code>(m, i)</code> and <code>y</code> with shape <code>(m, j)</code> (so the number of rows is the same). I would like to multiply each column of <code>x</code> with each column of <code>y</code> element-wise so that the result is of shape <code>(m, i*j)</code>.</p>... | 4 | 2016-08-02T08:22:49Z | 38,715,383 | <p>Use <a href="http://docs.scipy.org/doc/numpy/user/basics.broadcasting.html" rel="nofollow"><code>NumPy broadcasting</code></a> -</p>
<pre><code>(y[:,None]*x[...,None]).reshape(x.shape[0],-1)
</code></pre>
<p><strong>Explanation</strong></p>
<p>As inputs, we have -</p>
<pre><code>y : 10 x 2
x : 10 x 3
</code></pr... | 6 | 2016-08-02T08:26:57Z | [
"python",
"numpy",
"vectorization"
] |
Matrix of Key-Value Pairs / Dict | 38,715,321 | <p>I have several objects from <code>type dict</code> with different keys. I want to create a table <code>with all keys</code> and foreach object one row. If one key isn't available, it should be empty.</p>
<p>For Example:</p>
<pre><code>x1=dict( {"a":2, "b":3})
x2=dict( {"a":2, "b":3, "c":2})
</code></pre>
<p>and i... | 0 | 2016-08-02T08:24:26Z | 38,715,541 | <p>If you use pandas, you can do this:</p>
<pre><code>import pandas as pd
df = pd.DataFrame({k: [v] for k, v in x1.iteritems()})
df2 = pd.DataFrame({k: [v] for k, v in x2.iteritems()})
df = pd.concat((df, df2), ignore_index=True)
# a b c
# 0 2 3 NaN
# 1 2 3 2
</code></pre>
<p>Note: <code>iteritems()</co... | 1 | 2016-08-02T08:35:52Z | [
"python"
] |
Matrix of Key-Value Pairs / Dict | 38,715,321 | <p>I have several objects from <code>type dict</code> with different keys. I want to create a table <code>with all keys</code> and foreach object one row. If one key isn't available, it should be empty.</p>
<p>For Example:</p>
<pre><code>x1=dict( {"a":2, "b":3})
x2=dict( {"a":2, "b":3, "c":2})
</code></pre>
<p>and i... | 0 | 2016-08-02T08:24:26Z | 38,715,663 | <p>As a general approach (I am assuming you have a list of dicts, here, and you are fine with having the columns in "asciibetical" order):</p>
<pre><code>def EmitDictsAsCSV(list_of_dicts):
# First, accumulate the full set of dict keys
key_set = set()
for d in list_of_dicts:
key_set.update(d.iterkeys())
#... | 0 | 2016-08-02T08:42:39Z | [
"python"
] |
Matrix of Key-Value Pairs / Dict | 38,715,321 | <p>I have several objects from <code>type dict</code> with different keys. I want to create a table <code>with all keys</code> and foreach object one row. If one key isn't available, it should be empty.</p>
<p>For Example:</p>
<pre><code>x1=dict( {"a":2, "b":3})
x2=dict( {"a":2, "b":3, "c":2})
</code></pre>
<p>and i... | 0 | 2016-08-02T08:24:26Z | 38,715,806 | <p>Here is another simple solution that does not use <code>pandas</code>:</p>
<pre><code>all_dics = [x1, x2]
keys = set(key for d in all_dics for key in d) # {'a', 'b', 'c'}
dic = {key: [None]*len(all_dics) for key in keys} # {'a': [None, None], 'b': [None, None], 'c': [None, None]}
for j, d in enumerate(all_dics):
... | 0 | 2016-08-02T08:49:01Z | [
"python"
] |
Matrix of Key-Value Pairs / Dict | 38,715,321 | <p>I have several objects from <code>type dict</code> with different keys. I want to create a table <code>with all keys</code> and foreach object one row. If one key isn't available, it should be empty.</p>
<p>For Example:</p>
<pre><code>x1=dict( {"a":2, "b":3})
x2=dict( {"a":2, "b":3, "c":2})
</code></pre>
<p>and i... | 0 | 2016-08-02T08:24:26Z | 38,716,213 | <p>Here is a very crude and possibly inefficient solution</p>
<pre><code>x1=dict( {"a":2, "b":3,"d":4,"e":5})
x2=dict( {"a":2, "b":3, "c":2})
z = dict(x1.items() + x2.items())
print(z.keys())
x1_vals = []
x2_vals = []
for keys in z.keys():
if keys in x1.keys():
x1_vals.append( x1[keys])
else:
... | 0 | 2016-08-02T09:08:06Z | [
"python"
] |
What does a call on queue.join() in main thread do to non-main threads? | 38,715,595 | <p>My code is as below, </p>
<pre><code>import time, queue, threading
def washer(dishes, dish_queue):
for dish in dishes:
print ("Washing", dish)
time.sleep(1)
dish_queue.put(dish)
def dryer(dish_queue):
while True:
dish = dish_queue.get()
print("Drying", dish) ... | 2 | 2016-08-02T08:38:49Z | 38,720,740 | <p>The short answer to your main question is nothing. </p>
<p>For a longer answer, here are two concurrency graphs, one without wait:
<a href="http://i.stack.imgur.com/z67vI.png" rel="nofollow"><img src="http://i.stack.imgur.com/z67vI.png" alt="enter image description here"></a></p>
<p>And one with:
<a href="http://i... | 1 | 2016-08-02T12:43:07Z | [
"python",
"multithreading",
"queue"
] |
How to close cmd after opening a file using Python in Windows? | 38,715,630 | <p>I have a written a program using Python to open a particular file (txt) which it creates during execution. I have made a batch file to access the script using command line. The batch script is as follows:</p>
<pre><code>@echo off
python F:\program\script.py %*
</code></pre>
<p>I have tried these two options for op... | 0 | 2016-08-02T08:40:51Z | 38,715,932 | <p>To execute a child program in a new process use <code>Popen</code></p>
<pre><code>from subprocess import Popen
Popen( [ "notepad.exe", "arg1", "arg2", "arg3" ] )
</code></pre>
| 1 | 2016-08-02T08:54:16Z | [
"python",
"windows",
"batch-file",
"cmd"
] |
Hide Bootstrap Modal after Python Flask template has rendered | 38,715,650 | <p>I am new to Python and Flask so I am not sure if I am going about this the right way.
I have 2 Bootstrap modals. One displays a generic "please wait while loading" spinner that should be displayed whilst my python GETs a JSON string from the server, processes the string as JSON and stores it. The second modal displ... | 1 | 2016-08-02T08:41:57Z | 38,718,555 | <p>For the loading modal just remove <em>{% if not ready %}</em> and <em>{% endif %}</em>. Then adapt the code slightly to show the message until the site is loaded:</p>
<pre><code>$("#pleaseWaitModal").modal("show");
$(document).ready(function(){
$("#pleaseWaitModal").modal("hide");
});
</code>... | 0 | 2016-08-02T10:58:30Z | [
"jquery",
"python",
"twitter-bootstrap",
"flask"
] |
Python3 - AttributeError: 'NoneType' object has no attribute 'contents' | 38,715,834 | <p>I am trying to create a very simple Python currency converter based off the xc.com currency converter website, however at the end of my program I get the following error:</p>
<p>line 16, in
print(result.contents[0])
AttributeError: 'NoneType' object has no attribute 'contents'</p>
<p>After researching similar... | 0 | 2016-08-02T08:50:00Z | 38,715,921 | <p>This error is pretty straightforward, <code>result</code> is <code>None</code>.</p>
<pre><code>result = soup.find('td', {'class', "rightCol"})
</code></pre>
<p>You're passing <code>find</code> the set <code>{'class', "rightCol"}</code> instead of the
<br/> dictionary <code>{'class': "rightCol"}</code></p>
| 3 | 2016-08-02T08:53:54Z | [
"python",
"python-3.x",
"module",
"attributeerror",
"nonetype"
] |
Python3 - AttributeError: 'NoneType' object has no attribute 'contents' | 38,715,834 | <p>I am trying to create a very simple Python currency converter based off the xc.com currency converter website, however at the end of my program I get the following error:</p>
<p>line 16, in
print(result.contents[0])
AttributeError: 'NoneType' object has no attribute 'contents'</p>
<p>After researching similar... | 0 | 2016-08-02T08:50:00Z | 38,715,940 | <p>The exception is thrown because your <code>result</code> name is bind to a <code>None</code> object, which is likely an indication of <code>BeautifulSoup.find</code> failing for some reasons, possibly because there is <code>,</code> where I would expect a <code>:</code> here:</p>
<pre><code>result = soup.find('td',... | 1 | 2016-08-02T08:54:42Z | [
"python",
"python-3.x",
"module",
"attributeerror",
"nonetype"
] |
Python datetime switching between US and UK date formats | 38,715,918 | <p>I'm using matplotlib to plot some data imported from CSV files. These files have the following format:</p>
<pre><code>Date,Time,A,B
25/07/2016,13:04:31,5,25550
25/07/2016,13:05:01,0,25568
....
01/08/2016,19:06:43,0,68425
</code></pre>
<p>The dates are formatted as they would be in the UK, i.e. <code>%d/%m/%Y</code... | 0 | 2016-08-02T08:53:49Z | 38,716,169 | <p>You're using strings in <code>%d/%m/%Y</code> format but you've given the format specifier as <code>%Y-%m-%d</code>. </p>
| 0 | 2016-08-02T09:05:27Z | [
"python",
"python-datetime"
] |
Python datetime switching between US and UK date formats | 38,715,918 | <p>I'm using matplotlib to plot some data imported from CSV files. These files have the following format:</p>
<pre><code>Date,Time,A,B
25/07/2016,13:04:31,5,25550
25/07/2016,13:05:01,0,25568
....
01/08/2016,19:06:43,0,68425
</code></pre>
<p>The dates are formatted as they would be in the UK, i.e. <code>%d/%m/%Y</code... | 0 | 2016-08-02T08:53:49Z | 38,719,000 | <p>Matplotlib's <a href="http://matplotlib.org/api/mlab_api.html#matplotlib.mlab.csv2rec" rel="nofollow">csv2rec</a> function parses your dates already and tries to be intelligent when it comes to parsing dates. The function has two options to influence the parsing, <code>dayfirst</code> should help here:</p>
<blockqu... | 1 | 2016-08-02T11:19:36Z | [
"python",
"python-datetime"
] |
PyCharm 2016.2 Automatic breakpoints | 38,715,969 | <p>I'm getting some 'odd' behaviour out of the debugger in PyCharm 2016.2. Whenever I make a change and the server restarts, I have a few automated breakpoints that always trigger. Specifically, it seems that I always get a break point at <strong>line 1226 in python2.7/dist-packages/pyinotify.py</strong> and <strong>li... | 2 | 2016-08-02T08:56:43Z | 39,054,805 | <p>This is a bug in PyCharm, Yet to be resolved. Refer this link.
<a href="https://youtrack.jetbrains.com/issue/PY-20442" rel="nofollow">https://youtrack.jetbrains.com/issue/PY-20442</a></p>
| 1 | 2016-08-20T13:43:06Z | [
"python",
"django",
"pycharm",
"jetbrains"
] |
select elements in a list by the occurrence of zeros in python | 38,716,055 | <p>Given a 2D list:</p>
<pre><code>X = [ [a,2], [b,12], [c,6], [d,0], [e,2], [f,0], [g,0], [h,12], [i,18] ]
</code></pre>
<p>I need to get a 2D list that groups all the sublists, separated by zeros in the <code>X[1]</code> column. I mean, I need to select:</p>
<pre><code>Y = [ [[a,2],[b,12],[c,6]], [[e,2]], [[h,12],... | 3 | 2016-08-02T09:00:32Z | 38,716,399 | <p>I believe this will do the work: </p>
<pre><code>[map(lambda a:a[0],list(v)) for k, v in itertools.groupby(X, lambda x: x[1] == 0) if not k]
</code></pre>
<p><strong>More explanation:</strong> </p>
<p>you want to groupby X according to the second value of each item in the list so you need to do:<br>
<code>ite... | 2 | 2016-08-02T09:16:38Z | [
"python",
"list",
"selection",
"itertools",
"zero"
] |
select elements in a list by the occurrence of zeros in python | 38,716,055 | <p>Given a 2D list:</p>
<pre><code>X = [ [a,2], [b,12], [c,6], [d,0], [e,2], [f,0], [g,0], [h,12], [i,18] ]
</code></pre>
<p>I need to get a 2D list that groups all the sublists, separated by zeros in the <code>X[1]</code> column. I mean, I need to select:</p>
<pre><code>Y = [ [[a,2],[b,12],[c,6]], [[e,2]], [[h,12],... | 3 | 2016-08-02T09:00:32Z | 38,716,618 | <p>I will do it like this:</p>
<pre><code>X = [ ['a',2], ['b',12], ['c',6], ['d',0], ['e',2], ['f',0], ['g',0], ['h',12], ['i',18] ]
ind = [-1] + [i for i in range(n) if X[i][1]==0] + [len(X)] # found the indices of the "zero" lists
Y = [X[ind[i]+1:ind[i+1]] for i in range(len(ind)-1)] # choose the items between those... | 0 | 2016-08-02T09:27:42Z | [
"python",
"list",
"selection",
"itertools",
"zero"
] |
select elements in a list by the occurrence of zeros in python | 38,716,055 | <p>Given a 2D list:</p>
<pre><code>X = [ [a,2], [b,12], [c,6], [d,0], [e,2], [f,0], [g,0], [h,12], [i,18] ]
</code></pre>
<p>I need to get a 2D list that groups all the sublists, separated by zeros in the <code>X[1]</code> column. I mean, I need to select:</p>
<pre><code>Y = [ [[a,2],[b,12],[c,6]], [[e,2]], [[h,12],... | 3 | 2016-08-02T09:00:32Z | 38,717,019 | <p>You can define your own splitter using an iterator:</p>
<pre><code>def splitter(L):
group = []
res = []
for i in iter(L):
if i[1]:
group.append(i[0])
if not i[1] and len(group):
res.append(group)
group = []
if len(group):
res.append(group)
... | 1 | 2016-08-02T09:45:37Z | [
"python",
"list",
"selection",
"itertools",
"zero"
] |
Usage of setdefault instead of defaultdict | 38,716,079 | <p>I need to create a structure like this :</p>
<pre><code>D = {i:{j:{k:0,l:1,m:2}},a:{b:{c:0,d:4}}}
</code></pre>
<p>So this can be done using defaultdict:</p>
<pre><code> D = defaultdict(defaultdict(Counter))
</code></pre>
<p>How do i use setdefault here?</p>
<p>EDIT :</p>
<p>Is it possible to combine setdefau... | -1 | 2016-08-02T09:01:33Z | 38,716,203 | <p>To build a multi-level dictionary with <code>setdefault()</code> you'd need to repeatedly access the keys like this:</p>
<pre><code>>>> from collections import Counter
>>> d = {}
>>> d.setdefault("i", {}).setdefault("j", Counter())
Counter()
>>> d
{'i': {'j': Counter()}}
</code><... | 0 | 2016-08-02T09:07:28Z | [
"python"
] |
error with strptime() to extract date from timestamp with python | 38,716,165 | <p>I try to extract hour from the timestamp :
I have a dataframe called df_no_missing : </p>
<pre><code>df_no_missing.info()
</code></pre>
<blockquote>
<pre><code><class 'pandas.core.frame.DataFrame'>
Int64Index: 34673 entries, 1 to 43228
Data columns (total 8 columns):
TIMESTAMP 34673 non-null object
P_... | 0 | 2016-08-02T09:05:16Z | 38,716,216 | <p>you would probably want to use <code>datetime.strptime</code> on a single entry rather than on the dataframe object itself? Try something like:</p>
<pre><code>for data in df_no_missing["TIMESTAMP"]:
mytime = datetime.strptime(data,"%d/%m/%Y %H:%M")
print (mytime.day)
print (mytime.hour)
</code></pre>
| 0 | 2016-08-02T09:08:15Z | [
"python",
"datetime",
"pandas"
] |
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