Code-Runner run module instead of run python file #17180

^{Originally posted by jwang1122 July 11, 2021}
A lots of people discuss unit test path issue online. If one module import another module, it works on code runner, but unit test could NOT find it. if you make the unit test find it, and code runner no longer works. It is because the code runner run python file directly. Is it possible change the code runner from

python $filename

to

python -m mypackage.$filename-without-py-extension

This way will make both unit test and code runner work same time. So developer can organize their file in different folder easily.

here is an example:

from .card import Card # use this line for unit test
# from card import Card # use this line for product

class BlackjackCard(Card):
    def getValue(self):
        switch = {"A":11,"J":10,"Q":10,"K":10}
        if self.face.isdigit():
            return int(self.face)
        return switch.get(self.face)

if __name__ == '__main__':
    heartsQ = BlackjackCard('Q', 'HEARTS') 
    print(heartsQ)
    print(heartsQ.getValue())

as you can see, the first line use python relative path, so unit test can find module card. but if you run this module locally

PS C:\Users\John\workspace\python-I> & c:/Users/John/workspace/python-I/env/Scripts/python.exe c:/Users/John/workspace/python-I/src/blackjack/blackjackcard.py
Traceback (most recent call last):
  File "c:/Users/John/workspace/python-I/src/blackjack/blackjackcard.py", line 1, in <module>
    from .card import Card # use this line for unit test
ImportError: attempted relative import with no known parent package
PS C:\Users\John\workspace\python-I>

We get ImportError. But if we can change code runner run the following command

PS C:\Users\John\workspace\python-I> python -m src.blackjack.blackjackcard
(Q, HEARTS)
10
PS C:\Users\John\workspace\python-I>

Obviously, it works.
The hard part for this is,
❓How to determine the package path? But I don't think it is something very hard to do.
✔️😄We know current folder, we know the file path, simply remove current folder from the path, change all '/' to '.' and then remove the file extension.

Don't you think this is a good idea?