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Python needs an actual default function
(lemmy.ml)
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Python doesn't need the name main check to function at all. that's just a convenience feature that lets developers also include arbitrary entry points into modules that are part of a library and expected to be used as such. If you're writing a script, a file with a single line in it reading
print("hello world")
will work fine when run:python thescript.py
Yes, because
Note the "I have the flow of execution", and the "if I want to build a library".
If you just want to build an executable, do as you wish, you already have the flow of execution.
If you want to build a library, make the relevant classes and functions and get out of the way (i.e., no IO, no long-running tasks).
If you want to combine them, use the main name check - or, make a package and do entry points that way. Either way works, because both can fulfill the goal of staying out of the way of those importing this as a library.