Mar 19, 2014 · The if statement allows you to create a main function which will be executed if your file is loaded as the "Main" module rather than as a library in another module. To be clear, this means that the Python interpreter starts at the first line of a file and executes it.

Jan 7, 2009 · # What gets printed if foo is the main program before import before function_a before function_b before __name__ guard Function A Function B 10.0 after __name__ guard # What gets printed if foo is imported as a regular module before import before function_a before function_b before __name__ guard after __name__ guard

Oct 28, 2010 · Reasons to have that if statement calling main() (in no particular order): Other languages (like C and Java) have a main() function that is called when the program is executed. Using this if, we can make Python behave like them, which feels more familiar for many people. Code will be cleaner, easier to read, and better organized. (yeah, I know ...

Apr 4, 2011 · I always write a main() function (appropriately named), and put nothing but command-line parsing and a call to main() in the if __name__ == '__main__' block. That's because no matter how silly, trivial, or single-purpose I originally expect that script to be, I always end up wanting to call it from another module at some later date.

Python isn't like other languages where it automatically calls the main() function. All you have done is defined your function. You have to manually call your main function: main() Also, you may commonly see this in some code: if __name__ == '__main__': main()

Nov 2, 2020 · def main(cli_args: List[str] = None) -> int: """ `cli_args` makes it possible to call this function command-line-style from other Python code without touching sys.argv. """ try: # Parsing with `argparse` and additional processing # is usually lenghty enough to …

Oct 28, 2010 · 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 …

Mar 13, 2017 · I've have written my my main() function and called it under if __name__ == '__main__' passing the input arguments. The inputs are currently hard coded to show what I'm trying to achieve. Any help in how to correctly construct my input arguments that the user will pass, which will then be passed onto the main function will be appreciated.

May 12, 2013 · I wanted to define a global variable in main, i.e., a variable that can be used by any function I call from the main function. Is that possible? What'd be a good way to do this? Thanks!

Nov 28, 2017 · When you guard a section of code with if __name__ == "__main__":, you're not defining a __main__ function. It's just a normal if statement that reads the global variable __name__ (which is set up by the Python interpreter automatically) and compares its value to a string. So there's no __main__ to be called from another module.