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Description
I had a few thoughts for some more linter checks I'd like to have. Would be happy to implement them here if you guys are interested.
1. return <value> or yield <?from> <?value> in __init__()
Example:
class Example:
def __init__():
return 1 # bad
yield # bad
yield 1 # bad
yield from () # bad
return # ok
Any returning of values, or yielding, in an __init__() would result in a runtime error, but not until you try to instantiate an object of the class. So I think this should be a reasonably safe on-by-default error.
2. assert <constant or fixed value>
Normal asserts:
assert condition
assert condition, "message"
There's already a flake8 check for asserting on a tuple specifically - e.g. accidentally adding parens around (condition, message). And there's a bugbear check for assert False warning that it's disabled by -O. But forgetting the condition (assert "message") or asserting on any other literal value or list/tuple will either always pass or always fail - and is probably unintentional?
3. Inconsistent returns in function
def func(x) -> int | None:
if x:
return 0
# should return None here
This one's more opinionated, but if a function returns something in some case, it should explicitly return something (None) in all other cases.