Does everyone call the function of the script main? I never use main(), just call the function what the program is supposed to do, this program calculates the IBNR? The function is called calculate_IBNR(), then at the end of the script if name = 'main': calculate_IBNR(test_params) to test de script, then is imported into a tkinter script to be converter to an exe with pyinstaller

I've always found needing to manually add a class instance parameter (i.e. self) to every object method really weird. And the constructors being named __init__. Not having multiple dispatch is kinda annoying too. Needing to use decorators for class methods, static methods, and abstract classes is also annoying. Now that I think about it, Python kinda sucks (even though it's the language I use the most, lol).

"pythonic"

Nothing prevents you from putting a call to “main()” in the global scope

Call the function from the if block.

Now your tests can more easily call it.

I think at my last job we did argument parsing in the if block, and passed stuff into the main function.

Alternative: put entry point code in file __main__.py & run the containing package (eg, some_package) as a top-level expression (eg, python -m some_package).