I am trying to pass a list as an argument to a command line program. Is there an argparse option to pass a list as option? Script is called like below Answer SHORT ANSWER Use the nargs option or the ‘append’ setting of the action option (depending on how you want the user interface to behave). nar…
How can I mock requests and the response?
I am trying to use Pythons mock package to mock Pythons requests module. What are the basic calls to get me working in below scenario? In my views.py, I have a function that makes variety of requests.get() calls with different response each time In my test class I want to do something like this but cannot fig…
Grouping Python dictionary keys as a list and create a new dictionary with this list as a value
I have a python dictionary Since the values in the above dictionary are not unique, I want to group the all the keys of unique values as a list and create a new dictionary as follows: Note the keys of new dictionary v should be sorted. I am finding it hard to visualize and implement this dictionary creation. …
How to access Aʟʟ global variables in a function?
I’m trying to mimic the matlab load and save functions. I’m following this thread: Shelve Code gives KeyError It is smart. However, if I write that code in a separate module, and try to import that module and invoke that function, then it can’t access the global variables. Specifically, I wr…
Removing all commas from list in Python
My issue: I’d like to add all the digits in this string ‘1.14,2.14,3.14,4.14’ but the commas are causing my sum function to not work correctly. I figured using a strip function would solve my issue but it seems as though there is still something I’m missing or not quite understanding. …
Reversed array in numpy?
Numpy tentative tutorial suggests that a[ : :-1] is a reversed a. Can someone explain me how we got there? I understand that a[:] means for each element of a (with axis=0). Next : should denote the number of elements to skip (or period) from my understanding. Answer As others have noted, this is a python slic…
Sliding window of M-by-N shape numpy.ndarray
I have a Numpy array of shape (6,2): I need a sliding window with step size 1 and window size 3 like this: I’m looking for a Numpy solution. If your solution could parametrise the shape of the original array as well as the window size and step size, that’d be great. I found this related answer Usi…
sqlalchemy.exc.ArgumentError: Can’t load plugin: sqlalchemy.dialects:driver
I am trying to run alembic migration and when I run It fails saying the database url is and I even have psycopg2 installed in my virtualenv Whay could be causing this issue? Answer Here’s how to produce an error like that: so I’d say you aren’t actually using the postgresql URL you think you…
“Flattening” a list of dictionaries
So my aim is to go from: to A way I got is: Is there any better more pythonic way? Answer
Django forms.DateInput does not apply the attributes given in attrs field
Placeholder, class not getting set when tried to apply through the django’s attrs specifier for forms.DateInput The form is a ModelForm. And according to the docs Takes same arguments as TextInput, with one more optional argument: Here is the code : The same is applied for a forms.TextInput and it works…