MyPy gives error Missing return statement even when all cases are tested

2024/4/15 1:52:04

I am getting a MyPy error "Missing return statement", even when I check for all possible cases inside a function.

For example, in the following code, MyPy is still giving me an error "9: error: Missing return statement", even though color can only be Color.RED, Color.GREEN, or Color.BLUE, and I test all those cases!

class Color(enum.IntEnum):RED: int = 1GREEN: int = 2BLUE: int = 3def test_enum(color: Color) -> str:if color == Color.RED:return "red"elif color == Color.GREEN:return "green"elif color == Color.BLUE:return "blue"
Answer

There really is no question in this question - mypy indeed behaves this way at the moment. The enum support is baked in, and is preliminary and somewhat ad-hoc. The kind of checking you are looking for might be implemented in the future.

However, this code is fragile; if Color will change, it will silently break. Remember that Python is not a compiled language - the typechecker pass is optional, and someone else might not use it.

The right way IMO is to add assert False at the end. This will also silence mypy.

https://en.xdnf.cn/q/73109.html

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