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know the features of your language (lemmy.world)

submitted 9 months ago by [email protected] to c/[email protected]

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[–] [email protected] 12 points 9 months ago* (last edited 9 months ago) (2 children)

Python, checking in ...

return (a or b)

Parentheses aren't necessary, I just prefer them for readability.

See python documentation on boolean operators for reference. Short story is a or b is an expression that evaluates to a if a is "truthy" else b. "Falsy" is empty strings/containers, 0 and None.

[–] [email protected] 13 points 9 months ago (1 children)

You need to be careful here though. You might not intend for 0 and None to mean the same thing.

[–] [email protected] 3 points 9 months ago* (last edited 9 months ago) (1 children)

So this won't do the intended thing if a is 0.

Edit: Sorry I meant to reply to the parent comment, realising now you already write the exact same thing.

[–] [email protected] 3 points 9 months ago

Also if a is an empty collection or str, or false.

[–] [email protected] 5 points 9 months ago (1 children)

There was PEP 505 to add a none-aware operator, but it lost support.

[–] [email protected] 1 points 9 months ago

That’s a shame, it would have been fitting in “modern” Python along with the walrus and static type system.