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 |
|---|---|---|---|---|---|---|---|---|---|
How to sort by likes or views Flask? | 39,001,584 | <p>I have a problem sorting <strong>Authors</strong> by <code>Author.likes</code> or <code>Author.views</code> .</p>
<p>Lets me first show you my codes snippets :</p>
<p><strong>views.py</strong></p>
<pre><code>from sqlalchemy import func
@app.route('/authors/')
def authors():
page = request.args.get('page', 1, ... | -1 | 2016-08-17T16:13:00Z | 39,001,673 | <p>Remove <code>func.count</code> and just order by <code>Author.likes</code>, it's already a count. <code>func.count</code> is for counting groups of things. Currently, you're grouping everything into one group and so you only get one item back. </p>
| 1 | 2016-08-17T16:17:38Z | [
"python",
"sqlalchemy"
] |
Django ImageField file max upload limit | 39,001,618 | <p>I have my avatar in my UserProfile model in models.py file:-</p>
<pre><code>class UserProfile(models.Model):
profileuser = models.OneToOneField(User)
handle = models.CharField(max_length=128, blank=True)
avatar = models.ImageField(upload_to='profile_images', blank=True)
</code></pre>
<p>In my forms.... | 0 | 2016-08-17T16:14:46Z | 39,001,934 | <p>This should work:</p>
<pre><code>class UserProfileForm(forms.ModelForm):
class Meta:
model= UserProfile
exclude= ('profileuser',)
def clean(self, *args, **kwargs):
super(UserProfileForm, self).clean(*args, **kwargs)
try:
avatar = self.cleaned_data['avatar']
except Exception as e... | 0 | 2016-08-17T16:32:26Z | [
"python",
"django"
] |
UnicodeDecodeError on python3 | 39,001,641 | <p>Im currently trying to use some simple regex on a very big .txt file (couple of million lines of text). The most simple code that causes the problem:</p>
<pre><code>file = open("exampleFileName", "r")
for line in file:
pass
</code></pre>
<p>The error message:</p>
<pre><code>Traceback (most recent ... | 2 | 2016-08-17T16:15:57Z | 39,001,821 | <p>It looks like it is invalid UTF-8 and you should try to read with <code>latin-1</code> encoding. Try</p>
<pre><code>file = open('exampleFileName', 'r', encoding='latin-1')
</code></pre>
| 0 | 2016-08-17T16:25:33Z | [
"python",
"regex",
"utf-8",
"decoding"
] |
UnicodeDecodeError on python3 | 39,001,641 | <p>Im currently trying to use some simple regex on a very big .txt file (couple of million lines of text). The most simple code that causes the problem:</p>
<pre><code>file = open("exampleFileName", "r")
for line in file:
pass
</code></pre>
<p>The error message:</p>
<pre><code>Traceback (most recent ... | 2 | 2016-08-17T16:15:57Z | 39,002,048 | <p>It is not possible to identify the encoding on the fly. So, either user a method which I wrote as a comment or use similar constructions (as proposed by another answer), but this is a wild shot:</p>
<pre class="lang-py prettyprint-override"><code>try:
file = open("exampleFileName", "r")
except UnicodeDecodeErro... | 0 | 2016-08-17T16:40:09Z | [
"python",
"regex",
"utf-8",
"decoding"
] |
Calculating surface normal in Python using Newell's Method | 39,001,642 | <p>I'm trying to implement Newell's Method to calculate the surface normal vector in Python, based on the following pseudocode from <a href="https://www.opengl.org/wiki/Calculating_a_Surface_Normal" rel="nofollow">here</a>.</p>
<pre><code>Begin Function CalculateSurfaceNormal (Input Polygon) Returns Vector
Set Ver... | 2 | 2016-08-17T16:15:57Z | 39,001,875 | <p>If you want an alternate approach to Newell's Method you can use the Cross-Product of 2 non-parallel vectors. That should work for just about any planar shape you'd provide it. I know the theory says it is for convex polygons, but examples we've looked at on Wolfram Alpha return an appropriate surface normal for e... | 1 | 2016-08-17T16:28:49Z | [
"python",
"3d",
"geometry"
] |
Calculating surface normal in Python using Newell's Method | 39,001,642 | <p>I'm trying to implement Newell's Method to calculate the surface normal vector in Python, based on the following pseudocode from <a href="https://www.opengl.org/wiki/Calculating_a_Surface_Normal" rel="nofollow">here</a>.</p>
<pre><code>Begin Function CalculateSurfaceNormal (Input Polygon) Returns Vector
Set Ver... | 2 | 2016-08-17T16:15:57Z | 39,021,428 | <p>Ok, the problem was actually a stupid one.</p>
<p>The lines like:</p>
<pre><code>n[0] += (v_curr.y - v_next.y) * (v_curr.z - v_next.z)
</code></pre>
<p>should be:</p>
<pre><code>n[0] += (v_curr.y - v_next.y) * (v_curr.z + v_next.z)
</code></pre>
<p>The values in the second set of brackets should be added, not ... | 0 | 2016-08-18T14:55:56Z | [
"python",
"3d",
"geometry"
] |
cython error by python import | 39,001,828 | <p>Iâm making an C++ class to manage the communication with a device (SPI). The idea is to use this C++ class on an Arduino and a Raspberry Pi. This way I need to make this class only once. </p>
<p>I will use the class on the Arduino (this is no problem).
I also want to use it on my Raspberry Pi together with python... | 0 | 2016-08-17T16:26:07Z | 39,002,696 | <p><code>bcm2835_init</code> is presumably in "bcm2835.cpp" so you need to add that to <code>sources</code> in "setup.py"</p>
<pre><code>sources=["dev.pyx","Device.cpp","bcm2835.cpp"]
</code></pre>
<p>Alternatively, if you have a bcm2835 library already compiled you might want to link to it by adding to "setup.py"</p... | 0 | 2016-08-17T17:16:13Z | [
"python",
"c++",
"cython"
] |
Convert Tecplot ascii to Python numpy | 39,001,856 | <p>I want to convert a <em>Tecplot</em> file into an array but I don't know how to do it.
Here is an extract of the file:</p>
<pre><code>TITLE = "Test"
VARIABLES = "x" "y"
ZONE I=18, F=BLOCK
0.1294538E-01 0.1299554E-01 0.1303974E-01 0.1311453E-01 0.1313446E-01 0.1319080E-01
0.1322709E-01 0.1323904E-01 0.133175... | 0 | 2016-08-17T16:28:00Z | 39,004,033 | <p>Solved it with the last option:</p>
<pre><code>arrays = []
with open(file, 'r') as a:
for line in a.readlines():
A = re.match(r'TITLE = (.*$)', line, re.M | re.I)
B = re.match(r'VARIABLES = (.*$)', line, re.M | re.I)
C = re.match(r'ZONE (.*$)', line, re.M | re.I)
if A or B or C:
... | 0 | 2016-08-17T18:39:10Z | [
"python",
"numpy",
"io",
"converter"
] |
Selenium webdriver functions are not showing in autosuggestion list pycharm | 39,002,097 | <p>I have installed Python pip selenium pycharm. all works but I see that the autosuggestion box doesn't show the web driver functions. is there a reason for this?</p>
<p>Selenium is installed for project interpreter in pycharm</p>
<p><a href="http://i.stack.imgur.com/LHkMQ.png" rel="nofollow">This is how autosuggest... | 1 | 2016-08-17T16:42:37Z | 39,044,220 | <p>When installing Selenium many folder are installed in the pythonxxx folder. Keep the folder Lib > site-package > Selenium and delete the other Selenium folder in python.</p>
| 0 | 2016-08-19T16:54:26Z | [
"python",
"python-3.x",
"selenium",
"selenium-webdriver",
"pycharm"
] |
Binning time series with pandas | 39,002,122 | <p>I'm having a time series in form of a <code>DataFrame</code> that I can <code>groupby</code> to a series </p>
<pre><code>pan.groupby(pan.Time).mean()
</code></pre>
<p>which has just two columns <code>Time</code> and <code>Value</code>: </p>
<pre><code>Time Value
2015-04-24 06:38:49 0.023844
2015-04... | 1 | 2016-08-17T16:44:00Z | 39,003,074 | <p>IIUC, you could use <a href="http://pandas.pydata.org/pandas-docs/version/0.17.0/generated/pandas.Grouper.html" rel="nofollow"><code>TimeGrouper</code></a> along with <a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.groupby.html" rel="nofollow"><code>groupby</code></a> on the index lev... | 1 | 2016-08-17T17:39:23Z | [
"python",
"pandas"
] |
Matplotlib - Legend of a specific contour at different instants | 39,002,125 | <p>I m trying to plot a figure with a specific contour line (level = 320) at different times that is why a loop is used.
I would like plot a legend with labels to specify the time during the loop as here :</p>
<p><a href="http://i.stack.imgur.com/cfSMK.png" rel="nofollow"><img src="http://i.stack.imgur.com/cfSMK.png"... | 0 | 2016-08-17T16:44:08Z | 39,064,664 | <p>I used: <a href="http://matplotlib.org/examples/pylab_examples/contour_demo.html" rel="nofollow">http://matplotlib.org/examples/pylab_examples/contour_demo.html</a></p>
<pre><code>cmap = plt.cm.hot
lines = []
labels = []
i = 0
instant = 0
for instant in range(0,Sigma_stockMAX.shape[2]):
name = 'test'
VM_M... | 1 | 2016-08-21T13:21:52Z | [
"python",
"numpy",
"matplotlib",
"contour"
] |
rasterio transform and affine | 39,002,173 | <p>Im trying to do some basic image filtering. Ive included a snippet verbatim from the rasterio cookbook (I removed .astype() from the median filter output). The issue is that my input and output rasters should have the same extent but dont. The transform and affine are different for the input and output. Is this the ... | 2 | 2016-08-17T16:46:18Z | 39,021,707 | <p>The rasterio docs include a <a href="https://mapbox.github.io/rasterio/topics/migrating-to-v1.html#affine-affine-vs-gdal-style-geotransforms" rel="nofollow">history affine/transform usage</a> that you may find useful. I used to have a couple lines like the following to handle this:</p>
<pre><code>out_profile = src.... | 0 | 2016-08-18T15:08:50Z | [
"python",
"rasterio"
] |
Scrapy: TypeError: start_requests() takes exactly 2 arguments (1 given) | 39,002,285 | <p>I'm starting work on a new scrapy project. So far I have:</p>
<pre><code>class ContactSpider(Spider):
name = "contact"
allowed_domains = ["http://www.domain.com/"]
start_urls = [
"http://web.domain.com/DECORATION"
]
def start_requests(self,response):
l = response.selector.xpa... | 0 | 2016-08-17T16:51:55Z | 39,005,071 | <p><code>start_requests</code> is a method from <code>scrapy.spider</code> it takes no arguments other than <code>self</code>. It is used to create starting <code>Requests</code> so it should <strong>yield</strong> some <code>Request</code> objects(or return a list of <code>Requests</code>).</p>
<pre><code>def start_r... | 3 | 2016-08-17T19:45:50Z | [
"python",
"scrapy"
] |
Pandas GroupBy apply all | 39,002,340 | <p>I've got an involved situation. Let's say I have the following example dataframe of loans:</p>
<pre><code>test_df = pd.DataFrame({'name': ['Jack','Jill','John','Jack','Jill'],
'date': ['2016-08-08','2016-08-08','2016-08-07','2016-08-08','2016-08-08'],
'amount': [1000.0,1500.0,2... | 4 | 2016-08-17T16:55:13Z | 39,002,970 | <p>You can do it by iterating through the groups, testing the condition using <code>any</code>, then setting back to the original dataframe using <code>loc</code>:</p>
<pre><code>test_df = pd.DataFrame({'name': ['Jack','Jill','John','Jack','Jill'],
'date': ['2016-08-08','2016-08-08','2016-08-07','20... | 2 | 2016-08-17T17:32:38Z | [
"python",
"pandas",
"dataframe"
] |
TensorFlow Choose GPU to use from multiple GPUs | 39,002,352 | <p>I'm new to TensorFlow and have installed CUDA-7.5 and cudnn-v4 as per the instructions on the TensorFlow website. After adjusting the TensorFlow configuration file and trying to run the following example from the website:</p>
<pre><code>python -m tensorflow.models.image.mnist.convolutional
</code></pre>
<p>I'm pre... | 0 | 2016-08-17T16:56:04Z | 39,002,657 | <p>You can set the <code>CUDA_VISIBLE_DEVICES</code> environment variable to expose only the ones that you want, quoting this example on <a href="http://www.acceleware.com/blog/cudavisibledevices-masking-gpus" rel="nofollow">masking gpus</a>:</p>
<pre><code>CUDA_VISIBLE_DEVICES=1 Only device 1 will be seen
CUDA_VISIB... | 3 | 2016-08-17T17:14:12Z | [
"python",
"cuda",
"tensorflow",
"gpu"
] |
How to see if a string contains all substrings from a list? [Python] | 39,002,391 | <p>Here's the scenario:</p>
<p>I have a long list of time-stamped file names with characters before and after the time-stamp.</p>
<p>Something like this: <code>prefix_20160817_suffix</code></p>
<p>What I want is a list (which will ultimately be a subset of the original list) that contains file names with specific pr... | 0 | 2016-08-17T16:58:32Z | 39,002,476 | <p>I'd compile the list into a <a href="https://docs.python.org/2/library/fnmatch.html" rel="nofollow"><code>fnmatch</code> pattern</a>:</p>
<pre><code>import fnmatch
pattern = '*'.join(contains)
filetered_filenames = fnmatch.filter(master_list, pattern)
</code></pre>
<p>This basically concatenates all strings in <c... | 4 | 2016-08-17T17:03:46Z | [
"python",
"python-3.x"
] |
How to see if a string contains all substrings from a list? [Python] | 39,002,391 | <p>Here's the scenario:</p>
<p>I have a long list of time-stamped file names with characters before and after the time-stamp.</p>
<p>Something like this: <code>prefix_20160817_suffix</code></p>
<p>What I want is a list (which will ultimately be a subset of the original list) that contains file names with specific pr... | 0 | 2016-08-17T16:58:32Z | 39,002,523 | <p>You're looking for something like that (using <a class='doc-link' href="http://stackoverflow.com/documentation/python/196/comprehensions/737/list-comprehensions#t=201608171708486260643">list comprehension</a> and <a class='doc-link' href="http://stackoverflow.com/documentation/python/209/list/8125/any-and-all#t=2016... | 1 | 2016-08-17T17:06:24Z | [
"python",
"python-3.x"
] |
How to see if a string contains all substrings from a list? [Python] | 39,002,391 | <p>Here's the scenario:</p>
<p>I have a long list of time-stamped file names with characters before and after the time-stamp.</p>
<p>Something like this: <code>prefix_20160817_suffix</code></p>
<p>What I want is a list (which will ultimately be a subset of the original list) that contains file names with specific pr... | 0 | 2016-08-17T16:58:32Z | 39,002,543 | <p>Given:</p>
<pre><code>>>> cond1=['prefix1', '2016', 'suffix']
>>> cond2=['201608', 'suffix']
>>> fn="prefix_20160817_suffix"
</code></pre>
<p>You can test the existence of each substring in the list of conditions with <code>in</code> and (in the interim example) a list comprehension:</p>... | 0 | 2016-08-17T17:07:23Z | [
"python",
"python-3.x"
] |
How to see if a string contains all substrings from a list? [Python] | 39,002,391 | <p>Here's the scenario:</p>
<p>I have a long list of time-stamped file names with characters before and after the time-stamp.</p>
<p>Something like this: <code>prefix_20160817_suffix</code></p>
<p>What I want is a list (which will ultimately be a subset of the original list) that contains file names with specific pr... | 0 | 2016-08-17T16:58:32Z | 39,002,577 | <p>This should work for you.</p>
<pre><code>filtered_list = []
for file_name in master_list:
for element in contains_array:
if element not in file_name:
break
filtered_list.append(file_name)
</code></pre>
| 0 | 2016-08-17T17:09:46Z | [
"python",
"python-3.x"
] |
How to see if a string contains all substrings from a list? [Python] | 39,002,391 | <p>Here's the scenario:</p>
<p>I have a long list of time-stamped file names with characters before and after the time-stamp.</p>
<p>Something like this: <code>prefix_20160817_suffix</code></p>
<p>What I want is a list (which will ultimately be a subset of the original list) that contains file names with specific pr... | 0 | 2016-08-17T16:58:32Z | 39,002,636 | <p>Your pseudocode was not far from a usable implementation as you see:</p>
<pre><code>masterList=["prefix_20160817_suffix"]
containsArray=['prefix1', '2016', 'suffix']
filteredListOfFilenames=[]
for fileName in masterList:
if all((element in fileName) for element in containsArray):
filteredListOfFilename... | 0 | 2016-08-17T17:13:06Z | [
"python",
"python-3.x"
] |
how to extract date/time parameters from a list of strings? | 39,002,454 | <p>i have a pandas dataframe having a column as </p>
<pre><code> from pandas import DataFrame
df = pf.DataFrame({ 'column_name' : [u'Monday,30 December,2013', u'Delivered', u'19:23', u'1']})
</code></pre>
<p>now i want to extract every thing from it and store in three columns as</p>
<pre><code>date sta... | 0 | 2016-08-17T17:02:26Z | 39,002,718 | <p>You can <a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.apply.html" rel="nofollow"><strong><code>apply()</code></strong></a> a function to a column, see the whole example:</p>
<pre><code>from pandas import DataFrame
df = DataFrame({'date': ['Monday,30 December,2013'], 'delivery': ['D... | 0 | 2016-08-17T17:17:41Z | [
"python",
"date",
"pandas"
] |
Installing OpenCV Python Bindings on Mac with VirtualEnv: Can't find interpreter | 39,002,549 | <p>I've been following <a href="http://www.pyimagesearch.com/2015/06/15/install-opencv-3-0-and-python-2-7-on-osx/" rel="nofollow">this</a> guide on installing OpenCV on MacOS. I'm stuck on step 8, where you cmake everything.</p>
<p>From the <code>~/opencv/build</code> directory, I run</p>
<pre><code>$ cmake
-D ... | 0 | 2016-08-17T17:07:43Z | 39,024,863 | <p>Well, eventually I went with the following approach: Don't bother getting cmake to use the virtualenv interpreter. You can just compile opencv and the copy the cv2.so file into your virtualenv. In my case this involved proceeding with the <a href="http://www.pyimagesearch.com/2015/06/15/install-opencv-3-0-and-pyth... | 0 | 2016-08-18T18:10:08Z | [
"python",
"opencv",
"numpy",
"cmake"
] |
Using python for loop to average data | 39,002,558 | <p>I have a data set that contains 20 years of monthly averages in a numpy array with dimensions (1x240). I'm trying to write a function to spit out the yearly averages. I've managed to do it (I believe), using a for loop, but when I stick the exact same code into a function, it only gives me the first of what should b... | 0 | 2016-08-17T17:08:21Z | 39,002,700 | <p>here's what you need...</p>
<pre><code>def yearlymean_gm(gm_data):
data= np.load(gm_data)
average = np.zeroes(20)
for i in range (0,20):
average[i]= data[i*12:i*12+12].sum()/12
print average
return average #don't return until the loop has completed
</code></pre>
| 1 | 2016-08-17T17:16:33Z | [
"python",
"arrays",
"numpy",
"for-loop"
] |
Using python for loop to average data | 39,002,558 | <p>I have a data set that contains 20 years of monthly averages in a numpy array with dimensions (1x240). I'm trying to write a function to spit out the yearly averages. I've managed to do it (I believe), using a for loop, but when I stick the exact same code into a function, it only gives me the first of what should b... | 0 | 2016-08-17T17:08:21Z | 39,003,162 | <p>Why not avoid the "for" loop altogether?</p>
<pre><code>def yearlymean_gm(gm_data):
data = np.load(gm_data)
data = data.reshape((12, 20))
print data.mean(axis=1)
return data.mean(axis=1)
</code></pre>
| 4 | 2016-08-17T17:44:58Z | [
"python",
"arrays",
"numpy",
"for-loop"
] |
Creating bigrams from a string using regex | 39,002,563 | <p>I have a string like:</p>
<pre><code>"[u'LOCATION_SLOT~-prep_in+*extend*to~prepc_according_to+expectancy~-nsubj+is~parataxis+NUMBER~nsubj+NUMBER_SLOT', u'LOCATION_SLOT~-prep_in+*extend*to~prepc_according_to+expectancy~-nsubj+is~parataxis+NUMBER~nsubj+NUMBER_SLOT']"
</code></pre>
<p>Which is taken from an Excel fil... | 0 | 2016-08-17T17:08:36Z | 39,002,851 | <p>I have solved this. The regex needs to go through twice to replace first the brackets, then get the first string, then remove quotes:</p>
<pre><code> text = "[u'LOCATION_SLOT~-prep_in+*extend*to~prepc_according_to+expectancy~-nsubj+is~parataxis+NUMBER~nsubj+NUMBER_SLOT', u'LOCATION_SLOT~-prep_in+*extend*to~prepc_... | 0 | 2016-08-17T17:25:21Z | [
"python",
"regex",
"string",
"list",
"n-gram"
] |
Creating bigrams from a string using regex | 39,002,563 | <p>I have a string like:</p>
<pre><code>"[u'LOCATION_SLOT~-prep_in+*extend*to~prepc_according_to+expectancy~-nsubj+is~parataxis+NUMBER~nsubj+NUMBER_SLOT', u'LOCATION_SLOT~-prep_in+*extend*to~prepc_according_to+expectancy~-nsubj+is~parataxis+NUMBER~nsubj+NUMBER_SLOT']"
</code></pre>
<p>Which is taken from an Excel fil... | 0 | 2016-08-17T17:08:36Z | 39,003,797 | <p>Your string looks like a Python list of unicode strings, right?</p>
<p>You can evaluate it to get list of unicode string. A good way to do that is to use <code>ast.literal_eval</code> function from the <a href="https://docs.python.org/2/library/ast.html#ast-helpers" rel="nofollow"><strong>ast</strong></a> module.</... | 1 | 2016-08-17T18:23:20Z | [
"python",
"regex",
"string",
"list",
"n-gram"
] |
Django - QuerySet - Get count for all determined child objects inside all parent objects | 39,002,617 | <p>I've got this model:</p>
<pre><code>class Order(models.Model):
#bunch of fields#
class Laptop(models.Model):
#bunch of fields#
class Camera(models.Model):
#bunch of fields#
class MusicPlayer(models.Model):
#bunch of fields#
</code></pre>
<p>The last three have a foreign key associated to the Ord... | 0 | 2016-08-17T17:12:12Z | 39,002,832 | <p>Add related_name to your models:</p>
<pre><code>class Laptop(models.Model):
order = models.ForeignKey(Order, related_name='laptops')
class Camera(models.Model):
order = models.ForeignKey(Order, related_name='cameras')
class MusicPlayer(models.Model):
order = models.ForeignKey(Order, related_name='musi... | 1 | 2016-08-17T17:23:44Z | [
"python",
"django",
"django-queryset"
] |
Python program to map a series of chemical reactions with unique nodes only appearing once | 39,002,631 | <p>I have written a program in python to compose a map of a chemistry an example of which is the below text in the format: reactants > products.</p>
<pre><code>H2 > H2
H2 > H2
H2 > H2*
H2 > H2*
H2 > H + H
H2 > H2^
H2 > H* + H
H2 > H + H
H2^ > H2^
H2^ > H^ + H
H2^ > H + H
H3^ > H3^
H... | 1 | 2016-08-17T17:12:59Z | 39,006,157 | <p>One of the problems you seem to be having is that you're not stripping the whitespace from around the reactants/products you parse out of the "qstrings" of reactions. This means that e.g. <code>' H2'</code> and <code>'H2 '</code> are treated as different species and so get distinct nodes in your graph.</p>
<p>You p... | 1 | 2016-08-17T20:57:48Z | [
"python",
"networkx"
] |
Getting 'dict_keys' object does not support indexing despite casting to list | 39,002,665 | <p>I am using Python 3 and despite of casting to list, I cannot seem to run my program.</p>
<p>This is the function calling:</p>
<pre><code>path = euleriancycle(edges)
</code></pre>
<p>And this is where I have used the keys method:</p>
<pre><code>def euleriancycle(e):
currentnode = list[e.keys()[0]]
path = ... | 0 | 2016-08-17T17:14:27Z | 39,002,721 | <p>The <code>dict_keys</code> objects, like sets, can not be indexed.</p>
<p>Instead of this:</p>
<pre><code>list[e.keys()[0]]
</code></pre>
<p>The next closest thing would be this:</p>
<pre><code>list(e)[0]
</code></pre>
<p>Python makes no guarantee on what key from the dict will be returned, so you might want to... | 4 | 2016-08-17T17:17:45Z | [
"python",
"python-3.x",
"dictionary",
"jupyter-notebook"
] |
Getting 'dict_keys' object does not support indexing despite casting to list | 39,002,665 | <p>I am using Python 3 and despite of casting to list, I cannot seem to run my program.</p>
<p>This is the function calling:</p>
<pre><code>path = euleriancycle(edges)
</code></pre>
<p>And this is where I have used the keys method:</p>
<pre><code>def euleriancycle(e):
currentnode = list[e.keys()[0]]
path = ... | 0 | 2016-08-17T17:14:27Z | 39,002,770 | <p>You are trying to index the <code>dict_keys</code> object, <em>then</em> convert that element to a list (syntax error of <code>list[...]</code> vs <code>list(...)</code> aside). You need to convert the entire object to a list first, <em>then</em> index it.</p>
<pre><code>currentnode = list[e.keys()[0]] # Wrong
cu... | 2 | 2016-08-17T17:20:16Z | [
"python",
"python-3.x",
"dictionary",
"jupyter-notebook"
] |
Error in python function pymongo | 39,002,751 | <p>This is a function that returns an error at the line with <code>post['date']</code>.</p>
<p>This is the error:</p>
<pre><code>in get_posts
post['date'] = post['date'].strftime("%A, %B %d %Y at %I:%M%p")
KeyError: 'date'
</code></pre>
<p>What does it mean?</p>
<p>This is the function:</p>
<pre><code>def get_... | 1 | 2016-08-17T17:19:11Z | 39,003,146 | <p><code>KeyError: 'date'</code> means that <code>post</code> doesn't have the attribute <code>date</code>.</p>
| 0 | 2016-08-17T17:44:12Z | [
"python",
"mongodb",
"mongodb-query",
"pymongo",
"keyerror"
] |
Sending message with Router-Dealer Proxy using c# and python | 39,002,823 | <p>I am able to have c# (client) and python (server) talk to each other by using a simple request-reply. However, I want my web application built on c# asp.net to be stable and need more clients and servers, so I tried connecting c# and python using the Router-Dealer Proxy with python.</p>
<p>I tried running the proxy... | 0 | 2016-08-17T17:23:13Z | 39,005,000 | <p>I'm assuming your servers use bind, so the proxy should <code>connect</code> to them rather than also using <code>bind</code>.</p>
<p>Note: in zeromq the order of application startup doesn't matter so you can tell your proxy to <code>connect</code> to a server that doesn't yet exist, when the server is started the ... | 0 | 2016-08-17T19:41:47Z | [
"c#",
"python",
"proxy",
"zeromq",
"netmq"
] |
Python curses not accept curses.KEY_UP as input | 39,002,864 | <p>I need your help in understanding the mistake in my new menu based python program.</p>
<p>I have created a menu based python using the curses library. The program works fine with main menu options by accepting all the keys including special keys as input when getting user input via <code>getch()</code> but with a s... | 0 | 2016-08-17T17:26:03Z | 39,059,220 | <p>When you did </p>
<pre><code>self.s = curses.newwin(height+2, 20, 6, 14)
</code></pre>
<p>you omitted setting properties for the new window, e.g,</p>
<pre><code>self.s.keypad(1)
</code></pre>
| 2 | 2016-08-20T22:25:22Z | [
"python",
"menuitem",
"curses"
] |
Too many open files in Windows when writing multiple HDF5 files | 39,002,942 | <p>My question is <strong>how to close HDF5 files indefinitely after writing them</strong>?</p>
<p>I am trying to save data to HDF5 files - there are around 200 folders and each folder contains some data for each day for this year.</p>
<p>When I retrieve and save data using pandas HDFStore with following code in iPyt... | 1 | 2016-08-17T17:31:07Z | 39,005,921 | <p>You can check / list all open files belonging to Python process in Windows using <code>psutil</code> module.</p>
<p>Demo:</p>
<pre><code>In [52]: [proc.open_files() for proc in psutil.process_iter() if proc.pid == os.getpid()]
Out[52]:
[[popenfile(path='C:\\Windows\\System32\\en-US\\KernelBase.dll.mui', fd=-1),
... | 1 | 2016-08-17T20:41:26Z | [
"python",
"pandas",
"hdf5",
"hdfstore"
] |
How to swap the rows of two tables in python (astropy.table)? | 39,003,083 | <p>I am trying to swap the rows of two python tables, e.g</p>
<pre><code> In [15]: print t2
x y z
---- ---- ----
20.0 30.0 40.0
50.0 60.0 70.0
80.0 90.0 99.0
In [16]: print t1
a b c
--- --- ---
1.0 2.0 3.0
3.0 4.0 5.0
6.0 7.0 8.0
</code></pre>
<p>I... | -1 | 2016-08-17T17:40:02Z | 39,003,408 | <p>Looks like your code has changed <code>t1[1]</code>and then the new value has overwritten <code>t2[1]</code>. You need to make an explicit copy of t1, change the copy and then alter t2 based on the original t1. If you have to do this with multiple steps, it might just be safer to make a copy of each and then overwri... | 0 | 2016-08-17T18:00:01Z | [
"python",
"swap",
"astropy"
] |
Better way of filtering in Django and seeing if the object exists | 39,003,093 | <p>A lot of times I find myself filtering for an object and returning <code>None</code> if it can't be found. However, the method I do this seems really inefficient (in terms of lines of code)</p>
<p>When I filter for an object I normally do something like this:</p>
<pre><code>person = Person.objects.filter(id=id)
if... | -2 | 2016-08-17T17:40:41Z | 39,003,465 | <p>Your <code>if/else</code> is unusual in that you assign <code>person</code> twice. I can't understand why. You have two options I think.</p>
<p>First, you could reduce <code>if/else</code> to just <code>if</code> like this:</p>
<pre><code>person = Person.objects.filter(name=name)
if not person:
person = None
<... | 1 | 2016-08-17T18:03:27Z | [
"python",
"django"
] |
Better way of filtering in Django and seeing if the object exists | 39,003,093 | <p>A lot of times I find myself filtering for an object and returning <code>None</code> if it can't be found. However, the method I do this seems really inefficient (in terms of lines of code)</p>
<p>When I filter for an object I normally do something like this:</p>
<pre><code>person = Person.objects.filter(id=id)
if... | -2 | 2016-08-17T17:40:41Z | 39,003,528 | <p>Filter return list (or empty list), so if you know you get list, and want to replace empty list with None:</p>
<pre><code>persons = Person.objects.filter(name=name)
if not any(person):
person = None
# single person
person = persons[0] # but there could be more than one
</code></pre>
<p>If you want single Perso... | 1 | 2016-08-17T18:07:21Z | [
"python",
"django"
] |
Better way of filtering in Django and seeing if the object exists | 39,003,093 | <p>A lot of times I find myself filtering for an object and returning <code>None</code> if it can't be found. However, the method I do this seems really inefficient (in terms of lines of code)</p>
<p>When I filter for an object I normally do something like this:</p>
<pre><code>person = Person.objects.filter(id=id)
if... | -2 | 2016-08-17T17:40:41Z | 39,003,754 | <p>Just use <code>.get()</code> if you want to get one person or return None.</p>
<pre><code>try:
person = Person.objects.get(name=name)
except (Person.DoesNotExist, Person.MultipleObjectsReturned) as e:
person = None
</code></pre>
| 1 | 2016-08-17T18:20:15Z | [
"python",
"django"
] |
Better way of filtering in Django and seeing if the object exists | 39,003,093 | <p>A lot of times I find myself filtering for an object and returning <code>None</code> if it can't be found. However, the method I do this seems really inefficient (in terms of lines of code)</p>
<p>When I filter for an object I normally do something like this:</p>
<pre><code>person = Person.objects.filter(id=id)
if... | -2 | 2016-08-17T17:40:41Z | 39,004,279 | <p>You can use <code>exists()</code></p>
<p>From the <a href="https://docs.djangoproject.com/en/1.10/ref/models/querysets/#django.db.models.query.QuerySet.exists" rel="nofollow" title="docs">docs</a>:</p>
<blockquote>
<p>If you only want to determine if at least one result exists (and donât need the actual object... | 1 | 2016-08-17T18:54:08Z | [
"python",
"django"
] |
Better way of filtering in Django and seeing if the object exists | 39,003,093 | <p>A lot of times I find myself filtering for an object and returning <code>None</code> if it can't be found. However, the method I do this seems really inefficient (in terms of lines of code)</p>
<p>When I filter for an object I normally do something like this:</p>
<pre><code>person = Person.objects.filter(id=id)
if... | -2 | 2016-08-17T17:40:41Z | 39,047,988 | <p>You cannot do like this. </p>
<pre><code>person = Person.objects.get(name=name)
</code></pre>
<p>will raise an exception.</p>
<p>What you can do is:</p>
<pre><code>try:
person = Person.objects.get(name=name)
except Person.MultipleObjectsReturned:
person = Person.objects.first()
except Person.DoesNotExist:
... | 1 | 2016-08-19T21:34:59Z | [
"python",
"django"
] |
Python: Access camera WITHOUT OpenCV | 39,003,106 | <p>Comrades,</p>
<p>I'd like to capture images from the laptop camera in Python. Currently all signs point to OpenCV. Problem is OpenCV is a nightmare to install, and it's a nightmare that reoccurs every time you reinstall your code on a new system. </p>
<p>Is there a more lightweight way to capture camera data in... | 0 | 2016-08-17T17:41:23Z | 39,003,827 | <p>I've done this before using <a href="http://www.pygame.org/download.shtml" rel="nofollow">pygame</a>. But I can't seem to find the script that I used... It seems there is a tutorial <a href="http://www.pygame.org/docs/tut/camera/CameraIntro.html" rel="nofollow">here</a> which uses the native camera module and is not... | 1 | 2016-08-17T18:24:41Z | [
"python",
"osx",
"camera"
] |
A more efficient solution for solving this matrix puzzle? | 39,003,147 | <p>Find the 3x3 matrix, M, whose rows, columns and diagonals add up to 15. Condition: you must use every number from 1-9.</p>
<p>I'm not very clever, so I just tried this brute force method:</p>
<pre><code>def solve_999():
for a in range(1, 10):
for b in range(1, 10):
for c in range(1, 10):
... | 1 | 2016-08-17T17:44:15Z | 39,003,495 | <p>The biggest speedup you will get will be from generating your squares so that they are already unique. The easiest way to do this is <code>itertools.permutations</code>. This will reduce you to checking 9! == 362880 boards rather than 387420489 boards (about 1/1000th the work) and you don't have to check to make sur... | 1 | 2016-08-17T18:05:06Z | [
"python",
"matrix",
"puzzle"
] |
A more efficient solution for solving this matrix puzzle? | 39,003,147 | <p>Find the 3x3 matrix, M, whose rows, columns and diagonals add up to 15. Condition: you must use every number from 1-9.</p>
<p>I'm not very clever, so I just tried this brute force method:</p>
<pre><code>def solve_999():
for a in range(1, 10):
for b in range(1, 10):
for c in range(1, 10):
... | 1 | 2016-08-17T17:44:15Z | 39,003,505 | <p>You can use the itertools.permutations library to iterate over all possibilities checking for your required sums.</p>
<p>While your code works for fixed size of input array (in this case 3x3 = 9), I have generalized it to check for any given sum over any range that is provided through the use of some python assist... | 0 | 2016-08-17T18:05:46Z | [
"python",
"matrix",
"puzzle"
] |
A more efficient solution for solving this matrix puzzle? | 39,003,147 | <p>Find the 3x3 matrix, M, whose rows, columns and diagonals add up to 15. Condition: you must use every number from 1-9.</p>
<p>I'm not very clever, so I just tried this brute force method:</p>
<pre><code>def solve_999():
for a in range(1, 10):
for b in range(1, 10):
for c in range(1, 10):
... | 1 | 2016-08-17T17:44:15Z | 39,003,794 | <p>Bit shorter than the others:</p>
<pre><code>>>> from itertools import permutations
>>> for a, b, c, d, e, f, g, h, i in permutations(range(1, 10)):
if 15 == a+b+c == d+e+f == a+d+g == b+e+h == a+e+i == c+e+g:
print(a, b, c)
print(d, e, f)
print(g, h, i)
... | 1 | 2016-08-17T18:23:12Z | [
"python",
"matrix",
"puzzle"
] |
A more efficient solution for solving this matrix puzzle? | 39,003,147 | <p>Find the 3x3 matrix, M, whose rows, columns and diagonals add up to 15. Condition: you must use every number from 1-9.</p>
<p>I'm not very clever, so I just tried this brute force method:</p>
<pre><code>def solve_999():
for a in range(1, 10):
for b in range(1, 10):
for c in range(1, 10):
... | 1 | 2016-08-17T17:44:15Z | 39,004,079 | <p>Its easy. Just think how many ways are there to build 15 out of a sum of three numbers.</p>
<pre><code>1+5+9, 1+6+8, 2+4+9, 2+5+8, 2+6+7, 3+4+8, 3+5+7, 4+5+6
</code></pre>
<p>Each sum appears in your square because there are only 8 ways.
5 must be in the center because it appears 4 times.
2,4,6,8 must be in the c... | 3 | 2016-08-17T18:41:45Z | [
"python",
"matrix",
"puzzle"
] |
Excel to PostgreSQL using Python | 39,003,159 | <p>I'm new to Python and I'm trying to export excel directly into postgreSQL without CSV files.</p>
<p>I don't know if it's possible.</p>
<p>I keep running into the error <code>'column "daily_date" is of type date but expression is of type numeric'</code>.</p>
<pre><code>import psycopg2
import xlrd
book = xlrd.open... | -1 | 2016-08-17T17:44:42Z | 39,005,370 | <p>Excel stores datetimes as numbers. You can use <code>xlrd.xldate.xldate_as_datetime</code> to convert:</p>
<pre><code> Daily_Date = xlrd.xldate.xldate_as_datetime(sheet.cell(r,0).value,book.datemode)
</code></pre>
| 0 | 2016-08-17T20:05:49Z | [
"python",
"excel",
"postgresql"
] |
Pygame reset an Image after scaling it | 39,003,192 | <p>I tried to enlarge an image by moving the mouse over the image and make it to the original size when moving away from it.
For example:</p>
<pre><code>if ImageRect.collidepoint(mouseX,mouseY):
Image = pygame.transform.scale(Image, (100,100))
else:
Image = pygame.transform.scale(Image, (64,64)) #actual size... | 0 | 2016-08-17T17:46:18Z | 39,003,476 | <blockquote>
<p>Some of the transforms are considered destructive. These means every
time they are performed they lose pixel data. Common examples of this
are resizing and rotating. For this reason, it is better to
retransform the original surface than to keep transforming an image
multiple times. (For exampl... | 0 | 2016-08-17T18:04:13Z | [
"python",
"image",
"pygame",
"mouse"
] |
how to check django_tables2 object empty/null? | 39,003,216 | <p>The problem I'm trying to solve:<br>
Display a search bar only when the table <code>my_table</code> is not empty, else, hide it.</p>
<p>Here's my views.py:</p>
<pre><code>def my_table(request):
model1 = Model1.objects.all().filter(Q(some_query))
table = MyTable(model1)
RequestConfig(request).configure(... | 2 | 2016-08-17T17:47:39Z | 39,007,177 | <p>In you views.py you can use:</p>
<pre><code>if table.data.data.__len__ > 0:
</code></pre>
<p>and in your template you can use:</p>
<pre><code>{% if table.data|length > 0 %}
do whatever you want here...
{% endif %}
</code></pre>
| 1 | 2016-08-17T22:24:06Z | [
"python",
"django"
] |
Python parsing multi column file | 39,003,251 | <p>I have a file where i need to parse and construct in to a single row from multi row using python</p>
<pre><code>NAME ID
TITLE DEP
USER1 0023
S1 SALES
USER2 0022
A2 ACCOUNT
</code></pre>
<p>As you can see here the file header are NAME, ID, TITLE, DEP</p>
<p>I want to print output like below so i can read ... | -1 | 2016-08-17T17:49:48Z | 39,003,358 | <p>Having all the words in a file called <code>file.txt</code> here is the code:</p>
<pre><code>
# read all the words
with open('file.txt') as f:
words = f.read().split()
# convert to groups of 4-s
groups4 = [words[i:i+4] for i in range(0, len(words), 4)]
# convert to lines with commas using join()
lines = [', '... | 0 | 2016-08-17T17:56:55Z | [
"python",
"parsing",
"multiline"
] |
Python parsing multi column file | 39,003,251 | <p>I have a file where i need to parse and construct in to a single row from multi row using python</p>
<pre><code>NAME ID
TITLE DEP
USER1 0023
S1 SALES
USER2 0022
A2 ACCOUNT
</code></pre>
<p>As you can see here the file header are NAME, ID, TITLE, DEP</p>
<p>I want to print output like below so i can read ... | -1 | 2016-08-17T17:49:48Z | 39,003,761 | <pre><code>infile = open('test_file_parse.csv','r')
def custom_func(x):
return next(x).strip().split()
while infile:
try:
print ','.join(reduce(lambda x, y: x + y, (custom_func(infile) for z in range(4))))
except TypeError:
break
infile.close()
</code></pre>
| 0 | 2016-08-17T18:20:52Z | [
"python",
"parsing",
"multiline"
] |
Python parsing multi column file | 39,003,251 | <p>I have a file where i need to parse and construct in to a single row from multi row using python</p>
<pre><code>NAME ID
TITLE DEP
USER1 0023
S1 SALES
USER2 0022
A2 ACCOUNT
</code></pre>
<p>As you can see here the file header are NAME, ID, TITLE, DEP</p>
<p>I want to print output like below so i can read ... | -1 | 2016-08-17T17:49:48Z | 39,004,006 | <p>If you know everything will be pairs of two lines and you know you can ignore empty lines, you could do something like:</p>
<pre><code>infile = open('test_file_parse.csv', 'r')
# A generator that yields the non-empty lines, without newlines.
lines = (l.strip() for l in infile if l.strip())
# An iterator to iterat... | 0 | 2016-08-17T18:36:59Z | [
"python",
"parsing",
"multiline"
] |
How can I detect whether I'm running in a Celery worker? | 39,003,282 | <p>Is there a way to determine, programatically, that the current module being imported/run is done so in the context of a celery worker?</p>
<p>We've settled on setting an environment variable before running the Celery worker, and checking this environment variable in the code, but I wonder if there's a better way?</... | 0 | 2016-08-17T17:52:06Z | 39,019,837 | <p>Adding a environment variable is a good way to check if the module is being run by celery worker. In the task submitter process we may set the environment variable, to mark that it is not running in the context of a celery worker.</p>
<p>But the better way may be to use some celery signals which may help to know if... | 0 | 2016-08-18T13:44:00Z | [
"python",
"celery"
] |
How can I detect whether I'm running in a Celery worker? | 39,003,282 | <p>Is there a way to determine, programatically, that the current module being imported/run is done so in the context of a celery worker?</p>
<p>We've settled on setting an environment variable before running the Celery worker, and checking this environment variable in the code, but I wonder if there's a better way?</... | 0 | 2016-08-17T17:52:06Z | 39,023,702 | <p>Depending on what your use-case scenario is exactly, you may be able to detect it by checking whether the request id is set:</p>
<pre><code>@app.task(bind=True)
def foo(self):
print self.request.id
</code></pre>
<p>If you invoke the above as <code>foo.delay()</code> then the task will be sent to a worker and <... | 0 | 2016-08-18T16:57:21Z | [
"python",
"celery"
] |
How can I detect whether I'm running in a Celery worker? | 39,003,282 | <p>Is there a way to determine, programatically, that the current module being imported/run is done so in the context of a celery worker?</p>
<p>We've settled on setting an environment variable before running the Celery worker, and checking this environment variable in the code, but I wonder if there's a better way?</... | 0 | 2016-08-17T17:52:06Z | 39,093,390 | <p>It is a good practice to start workers with names, so that it becomes easier to manage(stop/kill/restart) them. You can use <code>-n</code> to name a worker.</p>
<pre><code>celery worker -l info -A test -n foo
</code></pre>
<p>Now, in your script you can use <code>app.control.inspect</code> to see if that worker i... | 0 | 2016-08-23T05:58:25Z | [
"python",
"celery"
] |
wxpython dialog return values with option to destroy | 39,003,360 | <p>I have a wxpython dialog (wrapped in a function call which returns user selection) that Im using to prompt user for "ok", "cancel" type questions.</p>
<p>I have another thread that is running that allows the user to click a button and perform an emergency stop (also wxpython). when the emergency stop button is clic... | 1 | 2016-08-17T17:56:59Z | 39,003,717 | <p>since i dont really understand what you are asking for, I will instead address "I wish wxpython just had a closeAll() :)"</p>
<pre><code>def wx_closeAll():
for win in wx.GetTopLevelWindows():
win.Destroy()
def closeAllButPrimary():
for win in wx.GetTopLevelWindows():
if win != wx.GetTopLeve... | 2 | 2016-08-17T18:17:49Z | [
"python",
"multithreading",
"return",
"wxpython"
] |
wxpython dialog return values with option to destroy | 39,003,360 | <p>I have a wxpython dialog (wrapped in a function call which returns user selection) that Im using to prompt user for "ok", "cancel" type questions.</p>
<p>I have another thread that is running that allows the user to click a button and perform an emergency stop (also wxpython). when the emergency stop button is clic... | 1 | 2016-08-17T17:56:59Z | 39,003,808 | <p>Doing GUI from threads is not a good idea, and nearly always gives unexpected results.</p>
<p>In order to show the message box from a thread, you need to make the thread ask the main thread to show the message box. </p>
<p>You do this using the function <a href="https://wiki.wxpython.org/CallAfter" rel="nofollow">... | 2 | 2016-08-17T18:23:43Z | [
"python",
"multithreading",
"return",
"wxpython"
] |
Brute force with python selenium? | 39,003,378 | <p>I am trying to brute force with <code>python selenium</code> But it seems to be too time taking unlike brute force with python requests,although both are different.I was wondering is there any way that brute force can be done more faster?</p>
| -1 | 2016-08-17T17:58:02Z | 39,003,568 | <p>I once wrote a Python script that used Splinter to drive Firefox via Selenium for a video that demonstrated brute-forcing a Wordpress login in the same fashion (for educating site owners about how easy it was to brute-force the Wordpress login by default). I used this method precisely because it was slower (and it w... | 1 | 2016-08-17T18:08:56Z | [
"python",
"selenium",
"python-requests",
"python-3.4"
] |
Programmatically getting list of child processes of a given PID | 39,003,433 | <p>I'd like to get a list of all the immediate children of a given PID. I'm OK with using <code>/proc</code> but <code>/proc/<PID>/task/<PID>/children</code> is NOT precise and may return inaccurate results (<a href="https://lwn.net/Articles/475688/" rel="nofollow">see section 3.7 here</a>). I'd like a more... | 1 | 2016-08-17T18:01:34Z | 39,003,721 | <p>Why not use psutils?</p>
<p>Here is an example where I kill all the children.</p>
<pre><code>def infanticide(pid):
try:
parent = psutil.Process(pid)
except psutil.NoSuchProcess:
return
children = parent.children(recursive=True)
for p in children:
os.kill(p.pid, signal.SIGKILL)
<... | 0 | 2016-08-17T18:18:01Z | [
"python",
"node.js",
"linux",
"ubuntu",
"process"
] |
Transform 3D polygon to 2D, perform clipping, and transform back to 3D | 39,003,450 | <p>My problem is that I have two walls, represented as 2D planes in 3D space, (<code>wallA</code> and <code>wallB</code>). These walls are overlapping. I need to convert that into three wall sections, one for the <code>wallA.intersect(wallB)</code>, one for <code>wallA.diff(wallB)</code>, and one for <code>wallB.diff(w... | 0 | 2016-08-17T18:02:48Z | 39,008,641 | <p>Rather than rotating, you can simply project. The key is to map the 3d space onto a 2d plane in a way that you can then reverse. (Any distortion resulting from the projection will be undone when you map back.) To do this, you should first find the plane that contains both of your walls. Here is some example code:</p... | 2 | 2016-08-18T01:33:28Z | [
"python",
"3d",
"geometry",
"transforms3d"
] |
How to fix appengine ImportError: No module named protobuf? | 39,003,464 | <p>I have the following folders structure:</p>
<pre><code>myappdir
- libs
- somelib
script1.py
script2.py
- google
- protobuf
__init__.py
message.py
...
__init__.py
...
app.yaml
appengine_config.py
...
</code></pre>
<p>And the following... | 1 | 2016-08-17T18:03:24Z | 39,003,903 | <p>Change the lines in your <strong>appengine_config.py</strong> file, from:</p>
<pre><code>import sys
sys.path.append('libs')
</code></pre>
<p>to:</p>
<pre><code>import sys
import os.path
sys.path.insert(0, os.path.join(os.path.dirname(__file__), 'libs'))
</code></pre>
| 0 | 2016-08-17T18:29:55Z | [
"python",
"google-app-engine",
"protocol-buffers",
"python-import"
] |
How to easy switch db in Django 1.9.x across multiple servers | 39,003,588 | <p>I have one application in Django 1.9.x, and I want to use multidb.</p>
<p>Have any configuration on the settings that I can enter multiple databases, and when it is on a specific server it uses the correct database. For example:</p>
<p>When I'm programming localhost use default, When I put in test serve, automatic... | 0 | 2016-08-17T18:10:14Z | 39,004,529 | <p>It sounds like you want to have environment specific databases, not necessarily a single app that connects to many databases. You can easily accomplish this with a custom settings module for each of these environments. </p>
<p>You might have a structure like the following : </p>
<pre><code>myproject/
- settin... | 1 | 2016-08-17T19:12:47Z | [
"python",
"mysql",
"django",
"database",
"postgresql"
] |
How to easy switch db in Django 1.9.x across multiple servers | 39,003,588 | <p>I have one application in Django 1.9.x, and I want to use multidb.</p>
<p>Have any configuration on the settings that I can enter multiple databases, and when it is on a specific server it uses the correct database. For example:</p>
<p>When I'm programming localhost use default, When I put in test serve, automatic... | 0 | 2016-08-17T18:10:14Z | 39,005,365 | <p>In your settings file:</p>
<pre><code>try:
from [app_name].local_settings import *
except ImportError:
pass
</code></pre>
<p>Changes you make in this local_settings file will be overridden. So now you can have a different local_settings file for your localhost, development or production. You can specify a ... | 4 | 2016-08-17T20:05:38Z | [
"python",
"mysql",
"django",
"database",
"postgresql"
] |
Beginner's Factorial Code | 39,003,652 | <p>I'm starting to learn Python and I have a small bit of code that takes the factorial of a user input. I'm trying to understand the logic behind what's going on so I can better understand the process. Why is it when I change the location of one of my variables the output changes? (I'm using python 2)</p>
<pre><code... | -2 | 2016-08-17T18:14:04Z | 39,003,695 | <p>If it is in the loop, that means that each loop iteration, product will be reset to 1. So you end up with the same result as if you ran just the final iteration of the loop. In other words the products don't accumulate.</p>
| 0 | 2016-08-17T18:16:58Z | [
"python"
] |
Beginner's Factorial Code | 39,003,652 | <p>I'm starting to learn Python and I have a small bit of code that takes the factorial of a user input. I'm trying to understand the logic behind what's going on so I can better understand the process. Why is it when I change the location of one of my variables the output changes? (I'm using python 2)</p>
<pre><code... | -2 | 2016-08-17T18:14:04Z | 39,003,702 | <p>That's because every time the for loop runs, you're setting:</p>
<p>product = 1</p>
| 0 | 2016-08-17T18:17:25Z | [
"python"
] |
Beginner's Factorial Code | 39,003,652 | <p>I'm starting to learn Python and I have a small bit of code that takes the factorial of a user input. I'm trying to understand the logic behind what's going on so I can better understand the process. Why is it when I change the location of one of my variables the output changes? (I'm using python 2)</p>
<pre><code... | -2 | 2016-08-17T18:14:04Z | 39,003,724 | <p>product is reset to 1 in every iteration of the loop.</p>
| 0 | 2016-08-17T18:18:06Z | [
"python"
] |
Beginner's Factorial Code | 39,003,652 | <p>I'm starting to learn Python and I have a small bit of code that takes the factorial of a user input. I'm trying to understand the logic behind what's going on so I can better understand the process. Why is it when I change the location of one of my variables the output changes? (I'm using python 2)</p>
<pre><code... | -2 | 2016-08-17T18:14:04Z | 39,003,743 | <p>By putting</p>
<pre><code>product = 1
</code></pre>
<p>inside the loop, you are re-initializing the total value each iteration of the loop.</p>
<p>If the user were to enter 3,
It would show <code>1, 2, 3</code> because every iteration you are just creating a variable product with the value of 1, and multiplying ... | 1 | 2016-08-17T18:19:07Z | [
"python"
] |
Beginner's Factorial Code | 39,003,652 | <p>I'm starting to learn Python and I have a small bit of code that takes the factorial of a user input. I'm trying to understand the logic behind what's going on so I can better understand the process. Why is it when I change the location of one of my variables the output changes? (I'm using python 2)</p>
<pre><code... | -2 | 2016-08-17T18:14:04Z | 39,003,769 | <p>The loop works like this:</p>
<pre><code>user_input = input("enter a positive number")
for i in range(user_input):
product = 1 #Set product to 1
product = product * (i + 1) #Increase product
print(product) #Print the product
</code></pre>
<p>Every loop the value of <cod... | 1 | 2016-08-17T18:21:45Z | [
"python"
] |
Beginner's Factorial Code | 39,003,652 | <p>I'm starting to learn Python and I have a small bit of code that takes the factorial of a user input. I'm trying to understand the logic behind what's going on so I can better understand the process. Why is it when I change the location of one of my variables the output changes? (I'm using python 2)</p>
<pre><code... | -2 | 2016-08-17T18:14:04Z | 39,003,782 | <p>this isnt going to answer your question ... but I find factorial is easiest to think about recursively </p>
<pre><code>def factorial(n):
#base case if n is 0 or 1 : 0! == 1! = 1
if n in (1,0): return 1
#recursive case : otherwise n! == n*(n-1)!
return n*factorial(n-1)
</code></pre>
| 1 | 2016-08-17T18:22:35Z | [
"python"
] |
Beginner's Factorial Code | 39,003,652 | <p>I'm starting to learn Python and I have a small bit of code that takes the factorial of a user input. I'm trying to understand the logic behind what's going on so I can better understand the process. Why is it when I change the location of one of my variables the output changes? (I'm using python 2)</p>
<pre><code... | -2 | 2016-08-17T18:14:04Z | 39,003,787 | <p>I think this is what you want to do. </p>
<pre><code>user_input = int(input("enter a positive number"))
product = 1
for i in range(user_input):
product = product * (i + 1)
print(product)
</code></pre>
<p>But when you put <strong>product = 1</strong> into loop, every time loop start with product =1 wh... | 0 | 2016-08-17T18:22:42Z | [
"python"
] |
AWS - OS Error permission denied Lambda Script | 39,003,668 | <p>I'm trying to execute a Lambda Script in Python with an imported library, however I'm getting permission errors.
I am also getting some alerts about the database, but database queries are called after the subprocess so I don't think they are related. Could someone explain why do I get error?</p>
<p>Alert informatio... | 0 | 2016-08-17T18:15:12Z | 39,023,870 | <p>I'm fairly certain that this is a restriction imposed by the lambda execution environment, but it can be worked around by executing the script through the shell.<br>
Try providing shell=True to your subprocess call:</p>
<pre><code>xml_output = subprocess.check_output(["./mediainfo", "--full", "--output=XML", signed... | 1 | 2016-08-18T17:07:58Z | [
"python",
"amazon-web-services",
"aws-lambda"
] |
cp: cannot stat â/mnt/ask78b30/TEST_FILEâ: Remote I/O error | 39,003,801 | <p>I am copying a file to nfs mounted dir. When I run the following command manually, the file is successfully copied</p>
<p>sudo cp TEST_FILE /mnt/ask78b30</p>
<p>However, when I use the same command in a python script, I get the following error,</p>
<p>running cmd = sudo cp TEST_FILE /mnt/ask78b30</p>
<p>cp: ca... | 1 | 2016-08-17T18:23:32Z | 39,003,862 | <p>I would recommend to use pythons shutil to copy files instead of calling cp</p>
<pre><code>from shutil import copyfile
copyfile(src, dst)
</code></pre>
| 0 | 2016-08-17T18:27:10Z | [
"python",
"linux",
"shell",
"mount",
"cp"
] |
How to find a word inside a list and search backwards from that word? | 39,003,837 | <p>How can I search for a specific word inside a list? Once I have searched for that specific word, how can I search backwards from there? In my example, I need to search for the city, and then search backwards to find the street type (ex: Rd, St, Ave, etc.)</p>
<p>I first allow a user to input an address, like <em>12... | 1 | 2016-08-17T18:25:14Z | 39,004,104 | <pre><code>for items in address:
if searchWord in items:
for each in reversed(address[0:address.index(searchWord)]):
if each == 'St':
print each
</code></pre>
<p>Once you find the city, reverse traverse the list using reversed</p>
| 0 | 2016-08-17T18:43:31Z | [
"python",
"list"
] |
How to find a word inside a list and search backwards from that word? | 39,003,837 | <p>How can I search for a specific word inside a list? Once I have searched for that specific word, how can I search backwards from there? In my example, I need to search for the city, and then search backwards to find the street type (ex: Rd, St, Ave, etc.)</p>
<p>I first allow a user to input an address, like <em>12... | 1 | 2016-08-17T18:25:14Z | 39,004,149 | <p>You can use <code>list.index</code> method to search the index of an item in a list.</p>
<p>There is no <code>list.rindex</code> method to search backward.
You need to use:</p>
<pre><code>rev_idx = len(my_list) - my_list[::-1].index(item) - 1
</code></pre>
<p>I don't really understand whatâs your aim, be I can ... | 0 | 2016-08-17T18:46:17Z | [
"python",
"list"
] |
passing arguments when scheduling a function with asyncio/aiocron | 39,003,853 | <p>I am using the <code>aiocron</code> library to schedule function calls for certain times of day. This is a minimal example of what I want to do. In this example, I want to send a "good morning" message every day at 8:00</p>
<pre><code>class GoodMorningSayer:
@asyncio.coroutine
def send_message(text)... | 1 | 2016-08-17T18:26:12Z | 39,005,726 | <p>I solved this myself for now by using a closure:</p>
<pre><code>class GoodMorningSayer:
def __init__(self):
@aiocron.crontab("0 8 * * *")
@asyncio.coroutine
def on_morning()
yield from self.send_message("good morning!")
@asyncio.coroutine
def send_message(text... | 0 | 2016-08-17T20:29:15Z | [
"python",
"python-3.x",
"python-asyncio"
] |
Django encoding problems with CSV | 39,003,878 | <p>File export works well, but I have a problem with encoding data.
Where I made ââmistakes?</p>
<p>My code is </p>
<pre><code>for user in users:
result = user[0].encode('utf-8')
for x in filter(lambda q: q is not None, user):
result += ', '
if type(x) in (str, unicode):
resul... | -4 | 2016-08-17T18:28:36Z | 39,005,251 | <p>The .encode method gets applied to a Unicode string to make a byte-string; if your CSV data is NOT in utf-8, and instead encoded let's say in latin-1, then you need a "transcoding". Something like this:</p>
<pre><code>line.decode('latin-1').encode('utf-8')
</code></pre>
<p>if you know your CSV encoding, then repla... | 0 | 2016-08-17T19:58:28Z | [
"python",
"django",
"csv",
"encoding",
"decoding"
] |
Django registration | change behaviour | 39,003,883 | <p>After succesfully registering, the user is redirected to the template 'registration_done.html'.</p>
<p>Is there any way of changing this behaviour to redirecting the user to the registration page and displaying a message?</p>
<p>I tried these code below also tried different ways to change it but have different typ... | 1 | 2016-08-17T18:28:48Z | 39,013,555 | <p>You are trying to pass the kwarg <code>success_url</code> to your function <code>register</code></p>
<p>Your function <code>register(request)</code> only accepts one argument: 'request'.</p>
<p>So you can accept a second argument, say success_url, like so</p>
<pre><code>def register(request, success_url):
...... | 1 | 2016-08-18T08:40:11Z | [
"python",
"django",
"python-3.x",
"django-views",
"django-1.9"
] |
Can't find TF_MIN_GPU_MULTIPROCESSOR_COUNT | 39,003,909 | <p>I get a message that says my GPU Device is ignored because its multiprocessor count is lower than the minimum set. However, it gives me the environment variable <em>TF_MIN_GPU_MULTIPROCESSOR_COUNT</em> but it doesn't seem to exist because I keep getting command not found. When I look at the environment variables usi... | 0 | 2016-08-17T18:30:17Z | 39,004,702 | <p>Do something like this before running your main script
<code>export TF_MIN_GPU_MULTIPROCESSOR_COUNT=4</code> </p>
<p>Note though that the default is set for a reason -- if you enable slower GPU by changing that variable, your program may run slower than it would without any GPU available, because TensorFlow will tr... | 0 | 2016-08-17T19:23:29Z | [
"python",
"tensorflow",
"gpu"
] |
Joining elements in list in python | 39,003,982 | <p>I have the data below, I want to find the unique values in 'a' and sum the data for the corresponding indices from 'b', 'c'. Any ideas on the best way to do this? I'm not sure where to start.</p>
<pre><code>a = ['x', 'y', 'z', 'z', 'x', 'w']
b = [ 1, 4, 5, 7, 9, 5]
c = [ 3, 6, 7, 8, 9, 7]
</code... | 2 | 2016-08-17T18:35:05Z | 39,004,173 | <p>Use <code>collections.defaultdict</code>:</p>
<pre><code>from collections import defaultdict
a = ['x', 'y', 'z', 'z', 'x', 'w']
b = [ 1, 4, 5, 7, 9, 5]
c = [ 3, 6, 7, 8, 9, 7]
b_unique = collections.defaultdict(int)
c_unique = collections.defaultdict(int)
for k, bv, cv in zip(a,b,c):
b_uni... | 2 | 2016-08-17T18:48:08Z | [
"python",
"list"
] |
Joining elements in list in python | 39,003,982 | <p>I have the data below, I want to find the unique values in 'a' and sum the data for the corresponding indices from 'b', 'c'. Any ideas on the best way to do this? I'm not sure where to start.</p>
<pre><code>a = ['x', 'y', 'z', 'z', 'x', 'w']
b = [ 1, 4, 5, 7, 9, 5]
c = [ 3, 6, 7, 8, 9, 7]
</code... | 2 | 2016-08-17T18:35:05Z | 39,004,178 | <p>Could do something like this using <a href="https://docs.python.org/3/library/collections.html#ordereddict-objects" rel="nofollow">OrderedDict</a>, since you need to maintain the same order:</p>
<pre><code>from collections import OrderedDict
a = ['x', 'y', 'z', 'z', 'x', 'w']
b = [ 1, 4, 5, 7, 9, 5]
c = ... | 4 | 2016-08-17T18:48:27Z | [
"python",
"list"
] |
Joining elements in list in python | 39,003,982 | <p>I have the data below, I want to find the unique values in 'a' and sum the data for the corresponding indices from 'b', 'c'. Any ideas on the best way to do this? I'm not sure where to start.</p>
<pre><code>a = ['x', 'y', 'z', 'z', 'x', 'w']
b = [ 1, 4, 5, 7, 9, 5]
c = [ 3, 6, 7, 8, 9, 7]
</code... | 2 | 2016-08-17T18:35:05Z | 39,004,282 | <p>Using Pandas:</p>
<pre><code>import pandas as pd
# To keep original order of values.
a_ordered = [val for idx, val in enumerate(a) if val not in a[:idx]]
# >>> a_ordered
# OUT: ['x', 'y', 'z', 'w']
df = pd.DataFrame({'a': a, 'b': b, 'c': c}).groupby('a').sum().T[a_ordered]
a = df.columns.tolist()
b, c = ... | 2 | 2016-08-17T18:54:33Z | [
"python",
"list"
] |
Joining elements in list in python | 39,003,982 | <p>I have the data below, I want to find the unique values in 'a' and sum the data for the corresponding indices from 'b', 'c'. Any ideas on the best way to do this? I'm not sure where to start.</p>
<pre><code>a = ['x', 'y', 'z', 'z', 'x', 'w']
b = [ 1, 4, 5, 7, 9, 5]
c = [ 3, 6, 7, 8, 9, 7]
</code... | 2 | 2016-08-17T18:35:05Z | 39,004,516 | <p>Just felt like playing a little code-golf:</p>
<pre><code>>>> from collections import OrderedDict
>>> od = OrderedDict()
>>> for t in zip(a,zip(b,c)):
... od[t[0]] = [i + x for i,x in zip(od.get(t[0],[0,0]), t[1])]
...
>>> od
OrderedDict([('x', [10, 12]), ('y', [4, 6]), ('z', ... | 0 | 2016-08-17T19:11:55Z | [
"python",
"list"
] |
Joining elements in list in python | 39,003,982 | <p>I have the data below, I want to find the unique values in 'a' and sum the data for the corresponding indices from 'b', 'c'. Any ideas on the best way to do this? I'm not sure where to start.</p>
<pre><code>a = ['x', 'y', 'z', 'z', 'x', 'w']
b = [ 1, 4, 5, 7, 9, 5]
c = [ 3, 6, 7, 8, 9, 7]
</code... | 2 | 2016-08-17T18:35:05Z | 39,004,728 | <p>here is an elementary approach</p>
<pre><code>d1 = defaultdict(int)
d2 = defaultdict(int)
for x,y,z in zip(a,b,c):
d1[x] += y
d2[x] += z
an=list()
bn=list()
cn=list()
for k in sorted(d1.keys(), key=lambda x:a.index(x)):
an.append(k)
bn.append(d1[k])
cn.append(d2[k])
[an,bn,cn]
[['x', 'y', '... | 0 | 2016-08-17T19:24:42Z | [
"python",
"list"
] |
Data entry in sqlite database | 39,004,080 | <p>l m a fresh user and l m not good at coding yet. l created a database with 3 columns: <code>(date, station, pcp )</code>.
l have <code>41_years_data</code> set and by using a <code>for</code> loop, l would like to insert these data set in database. I could not do it correctly. When l run the code, it gives </p>
<pr... | 1 | 2016-08-17T18:41:48Z | 39,004,137 | <p>Your <code>INSERT</code> statement </p>
<pre><code>c.execute("INSERT INTO pcp VALUES(kdm,station,klm)")
</code></pre>
<p>contains the names of your variables that hold the data values.</p>
<p>You need to construct the <code>INSERT</code> statement by concatenating the values inside those variables. Like so. (Mayb... | 0 | 2016-08-17T18:45:39Z | [
"python",
"sqlite3"
] |
Data entry in sqlite database | 39,004,080 | <p>l m a fresh user and l m not good at coding yet. l created a database with 3 columns: <code>(date, station, pcp )</code>.
l have <code>41_years_data</code> set and by using a <code>for</code> loop, l would like to insert these data set in database. I could not do it correctly. When l run the code, it gives </p>
<pr... | 1 | 2016-08-17T18:41:48Z | 39,024,054 | <p>l solved the problem and it inserted values of date, station and pcp into pcp columns but l had to use range(1000(just for trial number)) for it.is there any suggestion to make my code better?</p>
<pre><code>import sqlite3
from sqlite3 import *
from datetime import date, datetime, timedelta
conn=sqlite3.connect("... | 0 | 2016-08-18T17:20:11Z | [
"python",
"sqlite3"
] |
In python multi-producer & multi-consumer threading, may queue.join() be unreliable? | 39,004,095 | <p>A python multi-producer & multi-consumer threading pseudocode:</p>
<pre><code>def threadProducer():
while upstreams_not_done:
data = do_some_work()
queue_of_data.put(data)
def threadConsumer():
while True:
data = queue_of_data.get()
do_other_work()
queue_of_data.... | 1 | 2016-08-17T18:43:01Z | 39,004,610 | <p>The usual way is to put a sentinel value (like <code>None</code>) on the queue, one for each consumer thread, when producers are done. Then consumers are written to exit the thread when it pulls <code>None</code> from the queue.</p>
<p>So, e.g., in the main program:</p>
<pre><code>for t in list_of_producers:
... | 1 | 2016-08-17T19:18:13Z | [
"python",
"multithreading",
"queue"
] |
Python-Using character exclusion and quantifiers in a lookbehind to ignore characters if they exist | 39,004,117 | <p>Want to be able to grab a string with regex that is able to grab values regardless of whether or not something exists in a lookbehind.
E.g. the two strings below</p>
<pre><code> string_1 = "this('isastring', 'secondstring')"
string_2 = "this(\\'issomeotherstring\\', \\'ADiffSecondString\\')
</code></pre>
<p... | 0 | 2016-08-17T18:44:35Z | 39,004,297 | <p>If by "grab", you mean find all strings, you can do as follow:</p>
<pre><code>string_1 = "this('isastring', 'secondstring')"
string_2 = "this(\\'issomeotherstring\\', \\'ADiffSecondString\\')"
import re
findall_str = re.compile(r"\\?'(.*?)\\?'").findall
print(findall_str(string_1))
print(findall_str(string_2))
<... | 0 | 2016-08-17T18:55:31Z | [
"python",
"regex"
] |
Most efficient way to turn dictionary into symmetric/distance matrix (Python | Pandas) | 39,004,152 | <p>I'm doing pairwise distance for something w/ a weird distance metric. I have a dictionary like <code>{(key_A, key_B):distance_value}</code> and I want to make a symmetric <code>pd.DataFrame</code> like a distance matrix. </p>
<p>What is the most efficient way to do this? I found one way but it doesn't seem like t... | 2 | 2016-08-17T18:46:29Z | 39,004,744 | <p>You can use <a href="http://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.spatial.distance.squareform.html#scipy.spatial.distance.squareform"><code>scipy.spatial.distance.squareform</code></a>, which converts a vector of distance computations, i.e. <code>[d(A,B), d(A,C), ..., d(C,D)]</code>, into the dis... | 7 | 2016-08-17T19:25:55Z | [
"python",
"pandas",
"numpy",
"matrix",
"distance"
] |
Most efficient way to turn dictionary into symmetric/distance matrix (Python | Pandas) | 39,004,152 | <p>I'm doing pairwise distance for something w/ a weird distance metric. I have a dictionary like <code>{(key_A, key_B):distance_value}</code> and I want to make a symmetric <code>pd.DataFrame</code> like a distance matrix. </p>
<p>What is the most efficient way to do this? I found one way but it doesn't seem like t... | 2 | 2016-08-17T18:46:29Z | 39,005,028 | <p>Given a dictionary of keys (of single characters) and distances, here's a NumPy based approach -</p>
<pre><code>def dict2frame(D_pair_value):
# Extract keys and values
k = np.array(D_pair_value.keys())
v = np.array(D_pair_value.values())
# Get row, col indices from keys
idx = (np.fromstring(k.t... | 1 | 2016-08-17T19:43:38Z | [
"python",
"pandas",
"numpy",
"matrix",
"distance"
] |
Command failed: ./distribute.sh -l | 39,004,228 | <p>I am trying to follow the instructions on <a href="https://kivy.org/docs/guide/packaging-android-vm.html" rel="nofollow">https://kivy.org/docs/guide/packaging-android-vm.html</a> to create kivy android applications. I installed Kivy Buildozer VM and was following instructions on the Readme file. Created the buildoze... | 0 | 2016-08-17T18:51:17Z | 39,004,764 | <p>As you can see here <a href="https://github.com/kivy/python-for-android/blob/master/distribute.sh" rel="nofollow">python-for-android</a> the distribute.sh file is not supposed to be used anymore. <a href="http://buildozer.readthedocs.io/en/latest/quickstart.html" rel="nofollow">Here</a> you have a guide how to use <... | 0 | 2016-08-17T19:27:12Z | [
"android",
"python",
"kivy"
] |
Command failed: ./distribute.sh -l | 39,004,228 | <p>I am trying to follow the instructions on <a href="https://kivy.org/docs/guide/packaging-android-vm.html" rel="nofollow">https://kivy.org/docs/guide/packaging-android-vm.html</a> to create kivy android applications. I installed Kivy Buildozer VM and was following instructions on the Readme file. Created the buildoze... | 0 | 2016-08-17T18:51:17Z | 39,436,346 | <p>If you get this error in the Kivy Android Build Image you should update buildozer like this:</p>
<p>1.type</p>
<pre><code>sudo pip install -U buildozer
</code></pre>
<p>2. delete the .buildozer folder in your app folder</p>
<p>The sudo password for this image is kivy123</p>
<ol start="3">
<li><p>type </p>
<pre... | 0 | 2016-09-11T12:58:48Z | [
"android",
"python",
"kivy"
] |
List of dictionaries to csv file without square brackets | 39,004,283 | <pre><code>with open('processedData/file.tsv', 'wb') as f:
dict_writer = csv.DictWriter(f, keys, delimiter = '\t')
dict_writer.writeheader()
dict_writer.writerows(hgnc_list)
</code></pre>
<p>By executing the above code, I'm successfully writing my list of dictionaries to a file. </p>
<p><code>The catch is... | 0 | 2016-08-17T18:54:36Z | 39,004,366 | <p>The <code>csv</code> module (and CSV files in general) don't handle things like list entries in any special way. If you want to put a list into a CSV entry, you need to explicitly convert your values to strings, store the string values, and then parse them back into lists yourself when you read the data.</p>
<p>Fo... | 1 | 2016-08-17T19:00:32Z | [
"python",
"list",
"csv",
"dictionary"
] |
Tensorflow loss not changing and also computed gradients and applied batch norm but still loss is not changing? | 39,004,303 | <p>My Tensorflow loss is not changing. This is my code.</p>
<pre><code>from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import tensorflow as tf
import numpy as np
import math
import os
import nltk
import random
import tflearn
batch_size = 100
start = 0
end =... | 1 | 2016-08-17T18:56:00Z | 39,006,053 | <p>You can get all variables in the current graph by using <code>tf.all_variables()</code>. This will give a list of all variables as variable objects, and you can find what you are looking for by using <code>variable.name()</code> to identify a variable. You should also go and name all of the variables you are interes... | 0 | 2016-08-17T20:50:54Z | [
"python",
"numpy",
"machine-learning",
"neural-network",
"tensorflow"
] |
Chaining filters for a Series | 39,004,336 | <p>It's convenient to <a href="http://stackoverflow.com/a/28159296/336527">chain filters on a DataFrame using query</a>:</p>
<pre><code># quoting from the SO answer above
df = pd.DataFrame( np.random.randn(30,3), columns = ['a','b','c'])
df_filtered = df.query('a>0').query('0<b<2')
</code></pre>
<p>What if I... | 2 | 2016-08-17T18:58:10Z | 39,004,359 | <p>you can use <a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.Series.to_frame.html" rel="nofollow">to_frame()</a> method:</p>
<pre><code>In [10]: df.groupby('a').b.sum().to_frame('v').query('v > 3').query('v % 3 == 1')
Out[10]:
v
a
1 7
</code></pre>
<p>if you need result as series:</p>
... | 3 | 2016-08-17T18:59:59Z | [
"python",
"python-3.x",
"pandas",
"dataframe"
] |
Mock entire python class | 39,004,540 | <p>I'm trying to make a simple test in python, but I'm not able to figure it out how to accomplish the mocking process.</p>
<p>This is the class and def code:</p>
<pre><code>class FileRemoveOp(...)
@apply_defaults
def __init__(
self,
source_conn_keys,
source_conn_id='conn_d... | 3 | 2016-08-17T19:13:33Z | 39,004,889 | <p>First it is very important to understand that you always need to Mock where it the thing you are trying to mock out is used as stated in the <code>unittest.mock</code> documentation.</p>
<blockquote>
<p>The basic principle is that you patch where an object is looked up,
which is not necessarily the same place a... | 4 | 2016-08-17T19:34:26Z | [
"python",
"unit-testing",
"magicmock"
] |
How to display percentage label in histogram plot in Python | 39,004,606 | <p>I managed to create a plot that shows the number of records per class label for each age in my Pandas dataframe. But I would also like to see a percentage label for the "non functional" class in each age group.</p>
<p>The Python code for the graph is</p>
<pre><code>train['age_wpt'] = train.date_recorded.str.split(... | 0 | 2016-08-17T19:18:02Z | 39,004,677 | <blockquote>
<p>normed : boolean, optional
If <code>True</code>, the first element of the return tuple will
be the counts normalized to form a probability density, i.e.,
<code>n/(len(x)`dbin)</code>, i.e., the integral of the histogram will sum
to 1. If <em>stacked</em> is also <em>True</em>, ... | 0 | 2016-08-17T19:22:04Z | [
"python",
"matplotlib"
] |
Google Cloud Storage API write files with special characters vs regular python files | 39,004,673 | <p>I am using Google App Engine to write a new file to a Google Cloud Storage bucket for eventual serving in the browser. Normally on my local computer this writes a nice text file which I can open and see the test character as expected:</p>
<pre><code>with open('new_file.txt', 'w') as f:
f.write(u'é'.encode('utf... | 1 | 2016-08-17T19:21:36Z | 39,005,315 | <p>The default charset for HTTP 1.1 is ISO-8859-1.</p>
<p>If you want the browser to interpret your text as UTF-8, you should set the content-type header to include the charset, like this:</p>
<pre><code>with gcs.open('/mybucket/newfile.txt', 'w', content_type='text/html; charset=utf-8') as f:
</code></pre>
| 1 | 2016-08-17T20:02:20Z | [
"python",
"google-app-engine",
"character-encoding",
"google-cloud-storage",
"google-cloud-platform"
] |
pd.read_sql unicode types causing problems | 39,004,686 | <p>I'm formatting some data I'm pulling from a database using sqlalchemy, pyodbc, and pandas read_sql, which I get back as a dataframe <code>df</code>.</p>
<p>I want to apply a formatting of the data in each 'cell' of the dataframe, row by row and excluding the first two columns using this: </p>
<pre><code>df.iloc[6... | 0 | 2016-08-17T19:22:33Z | 39,007,144 | <p>You're trying to do string formatting for a <code>float</code>, but you're actually passing it a string.</p>
<p>To illustrate the source of your error, consider the following:</p>
<pre><code>'{:,.2f}%'.format(u'1')
</code></pre>
<p>which raises the same error:</p>
<pre><code>-------------------------------------... | 1 | 2016-08-17T22:21:10Z | [
"python",
"python-2.7",
"pandas"
] |
Custom sorting in Python | 39,004,687 | <p>I'm new to Python, thus the question,</p>
<p>I have the following list of list items,</p>
<pre><code>[[0, 1], [2,3], [1,2], [4, 5], [3, 5]]
</code></pre>
<p>I want to sort this list in increasing order comparing the second item of each list first and then the first item</p>
<p>This is my code,</p>
<pre><code>de... | 1 | 2016-08-17T19:22:34Z | 39,004,792 | <p>You should use Python's built-in <a href="https://docs.python.org/2/library/functions.html#sorted" rel="nofollow"><code>sorted()</code></a> method, it already has support for lambda comparisons.</p>
<pre><code>l = [[0, 1], [2,3], [1,2], [4, 5], [3, 5]]
l = sorted(l, cmp=sorting)
</code></pre>
<p>Your comparison fu... | 1 | 2016-08-17T19:28:34Z | [
"python",
"lambda"
] |
Custom sorting in Python | 39,004,687 | <p>I'm new to Python, thus the question,</p>
<p>I have the following list of list items,</p>
<pre><code>[[0, 1], [2,3], [1,2], [4, 5], [3, 5]]
</code></pre>
<p>I want to sort this list in increasing order comparing the second item of each list first and then the first item</p>
<p>This is my code,</p>
<pre><code>de... | 1 | 2016-08-17T19:22:34Z | 39,004,861 | <p>You can reverse the order when the sort looks at them. Just don't alter the original list items.</p>
<p>sorted(l, key=lambda x: (x[1], x[0]))</p>
| 2 | 2016-08-17T19:32:17Z | [
"python",
"lambda"
] |
simple matrix type rotation (without numpy or pandas) | 39,004,701 | <p>This must be something that is really simple, but I could not fix it.</p>
<p>I want to do a matrix type transpose with native python list of list (i.e., without using <code>numpy</code> or <code>pandas</code>). Code is show following. I am having a hard time trying to figure out where it is wrong.</p>
<pre><code>r... | 0 | 2016-08-17T19:23:24Z | 39,004,809 | <p>Well, doing a transpose with vanilla lists in Python is pretty easy: use <code>zip</code> and the splat operator:</p>
<pre><code>>>> raw_matrix_list = [[1, 0, 1, 0, 1, 0],
... [1, 0, 0, 0, 1, 0],
... [0, 0, 0, 0, 0, 1],
... [1, 0, 0, 0, 1, 1]]
>&g... | 2 | 2016-08-17T19:29:23Z | [
"python"
] |
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