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  • python - What does if __name__ == __main__: do? - Stack Overflow
    When the Python interpreter reads a source file, it first defines a few special variables In this case, we care about the __name__ variable When Your Module Is the Main Program If you are running your module (the source file) as the main program, e g python foo py
  • python - What is __main__. py? - Stack Overflow
    Executing from directory a and assuming script a b c __main__ py python -m b c will execute from the directory a and the main script's imports will be relative to a But python b c will execute from the import scope of dir c and so any imports like in the main script like import b d will fail –
  • python - Why use def main()? - Stack Overflow
    It will be possible to import that python code as a module without nasty side-effects This means it will be possible to run tests against that code This means we can import that code into an interactive python shell and test debug run it Variables inside def main are local, while those outside it are global This may introduce a few bugs and
  • python __main__ and __init__ proper usage - Stack Overflow
    1538:~ mypy$ python foo __main__ py ('main name', '__main__') in main in main main block It does same thing if I invoke the directory It does not import __init__ py 1541:~ mypy$ python foo ('main name', '__main__') in main in main main block But from a shell, it loads both files
  • python - What is the purpose of the -m switch? - Stack Overflow
    You must run python my_script py from the directory where the file is located Alternatively - python path to my_script py However, you can run python -m my_script (ie refer to the script by module name by omitting the py) from anywhere, as long as Python can find it! Python searches as follows (not 100% sure about the order): Current directory
  • scope - __main__ and scoping in python - Stack Overflow
    Variables in the current modules global scope are visible everywhere in the module -- this rule also holds for the __main__ module





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