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Python needs an actual default function
(lemmy.ml)
Also, do y'all call main() in the if block or do you just put the code you want to run in the if block?
If you want to have a library that can also be a standalone executable, just put the main function in an extra file and don't compile that file when using the library as a library.
You could also use the preprocessor to do it similar to python but please don't.
Just use any build tool, and have two targets, one library and one executable:
Edit: added example