this post was submitted on 16 Mar 2026
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PEP: Is initializing typed variable with None bad practice? (lemmy.world)
submitted 6 hours ago by AstroLightz@lemmy.world to c/python@programming.dev
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For example:

class FooBar:
    def __init__(self):
        self.a: int = None
        self.foo: str = None

Is this bad practice/go against PEP guidelines or is it fine?

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[โ€“] jtrek@startrek.website 7 points 6 hours ago (1 children)

That seems like that's going to give you an error in most type checkers. You said it's always an int and then immediate made that a lie and made it None instead.

Why are you trying to do this?

[โ€“] AstroLightz@lemmy.world 2 points 6 hours ago

I'm initializing variables that would be used later in the class in different functions. I wasn't sure if I needed to do a var: <type> | None = None or if just setting it to None was fine.