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How to write a Unit Test?
...low:
I hope it helps. You can see the structure of the project in GitHub https://github.com/m-vahidalizadeh/problem_solving_project.
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How can I debug git/git-shell related problems?
...ssh to validate your credentials, e.g.
ssh -vvvT git@github.com
or over HTTPS port:
ssh -vvvT -p 443 git@ssh.github.com
Note: Reduce number of -v to reduce the verbosity level.
Examples
$ GIT_TRACE=1 git status
20:11:39.565701 git.c:350 trace: built-in: git 'status'
$ GIT_TR...
Python vs Cpython
...interpreter).
NOTE: I got the link to this code from #python IRC channel: https://gist.github.com/nedbat/e89fa710db0edfb9057dc8d18d979f9c
And then, there is Jython, which is written in Java and ends up producing Java byte code. The Java byte code runs on Java Runtime Environment, which is an imple...
Does pandas iterrows have performance issues?
...s itertuples() is faster than iterrows().
you can refer the documentation: https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.iterrows.html
"To preserve dtypes while iterating over the rows, it is better to use itertuples() which returns namedtuples of the values and which ...
Fast permutation -> number -> permutation mapping algorithms
....1
("The Lehmer code (inversion table)", p.232ff) of the fxtbook:
http://www.jjj.de/fxt/#fxtbook
skip to section 10.1.1.1 ("Computation with large arrays" p.235) for the fast method.
The (GPLed, C++) code is on the same web page.
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How can I add a PHP page to WordPress?
... from the back end.
Please see this link for getting the correct details https://developer.wordpress.org/themes/template-files-section/page-template-files/.
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Creating a BLOB from a Base64 string in JavaScript
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See this example: https://jsfiddle.net/pqhdce2L/
function b64toBlob(b64Data, contentType, sliceSize) {
contentType = contentType || '';
sliceSize = sliceSize || 512;
var byteCharacters = atob(b64Data);
var byteArrays = [];
...
Random string generation with upper case letters and digits
...case + string.digits, k=N))
A cryptographically more secure version; see https://stackoverflow.com/a/23728630/2213647:
''.join(random.SystemRandom().choice(string.ascii_uppercase + string.digits) for _ in range(N))
In details, with a clean function for further reuse:
>>> import string...
Given a number, find the next higher number which has the exact same set of digits as the original n
...(str(ii))) if v>ii)
In C++ you could make the permutations like this: https://stackoverflow.com/a/9243091/1149664 (It's the same algorithm as the one in itertools)
Here's an implementation of the top answer described by Weeble and BlueRaja, (other answers). I doubt there's anything better.
de...
Does SQLAlchemy have an equivalent of Django's get_or_create?
... so it does not look like they try to handle this. Looking at the [source](https://github.com/django/django/blob/master/django/db/models/query.py#L491) confirms this. I'm not sure I understand your reply, you mean the user should put his/her query in a nested transaction? It's not clear to me how a ...