- cross-posted to:
- programminghumor@lemmy.world
- cross-posted to:
- programminghumor@lemmy.world
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?
You must log in or register to comment.
I recall that Gondor very much needed a king to return, like it was a pretty big deal that returning as king to Gondor was a necessary deal. Gondor needed Aragorn to return as king. It’s all documented in the third book, The Return of the King.
$ python -c 'return "King"' File "<string>", line 1 SyntaxError: 'return' outside function $Like I’m trusting a snake to be honest
i dont think boromir ever said that though, this is from that mess made by that B-horror director
if __name__ == '__main__': exec(open(__file__, 'r').read())
It’s less of a main, and more of a “don’t do this if being imported.” You can just throw code without that block and it will run.
It makes more sense if you’re used to shell scripts.
If it’s a quick dirty script like doing a one time update to multiple records then I’ll just write it under the if name == main.
Idk, I guess I should ask why python needs a default function? If I’m running it as a script with commandline invocation I just copy and paste the if main namespace thing from stack overflow and it works as I intended. It also works if I invoke via python my_script.py $args, so I don’t really see why I should philosophically care about how other languages that I’m not using do it.
Because if another consumer imports it you don’t want it running the main method
I can import my_script2.py into my_script.py it doesn’t run the main method unless I specifically invoke my_script2.main() though.
#!/usr/bin/env python def main() -> None: """executes when file is run as a standalone script""" print('hello world') if __name__ == '__main__': main()
print('hello world')
I always put all of the code in the main block. Only exception is when I am creating a multithreaded/multiprocessor application. Then I normally use the if statement as the place to setup “the plumbing” with pipes and what not. That way people are forced to realize there is no main function but two co functions working in tandem
Depends on the situation but since Py3 you now have main.py in Python Packages
that is so cursed
And I say that as someone who learnt python as her first language (to be proficient in):
holy shit is this language stupid
I’m gonna repeat what I wrote in another comment. You are comparing the default interpreted way of running python
gto a compiled language. When you compile a python program into a wheel, you define the entry points of the code on it, and they point to functions like main() or whatever you define.You aren’t complaining that a index.js doesn’t automatically run the main function when run by node, or that bash doesn’t also have a default main function execution. Interpreted languages oriented to scripting won’t have the same rules as compiled languages.
programming languages aren’t usually cursed, what’s cursed is the way some people decide to structure their programs. I’ve seen some stuff.
pythong
Glad to see I’m not the only one who can’t type python without Sigmund waving hello.
It’s my fucking keyboard. I’m all in for open source and stuff but it’s too much, I had to go back to proprietary ones because the other ones just suck for multi language inputs :(
Some programming languages are indeed cursed (e.g. JavaScript). But for the most part I agree, it’s what people do with it. But what’s cursed with python is what idioms have become common place.
It’s a common practice but not required. Python behaves like JS where it just runs whatever you wrote. If you don’t want it to run when importing the file you can put the main() inside the if so it only runs when you run the actual file.
You can use it when developing a function or a class to run a simple test without running the whole program.
