Cyclic0007/ruff

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Charlie Marsh 262c04f297 Use binary semantics when __iadd__ et al are unbound (#13987 )

## Summary

I noticed that augmented assignments on floats were yielding "not
supported" diagnostics. If the dunder isn't bound at all, we should use
binary operator semantics, rather than treating it as not-callable.

2024-10-30 13:09:22 +00:00

662 B

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Augmented assignment

Basic

x = 3
x -= 1
reveal_type(x)  # revealed: Literal[2]

x = 1.0
x /= 2
reveal_type(x)  # revealed: float

Dunder methods

class C:
    def __isub__(self, other: int) -> str:
        return "Hello, world!"

x = C()
x -= 1
reveal_type(x)  # revealed: str

class C:
    def __iadd__(self, other: str) -> float:
        return "Hello, world!"

x = C()
x += "Hello"
reveal_type(x)  # revealed: float

Unsupported types

class C:
    def __isub__(self, other: str) -> int:
        return 42

x = C()
x -= 1

# TODO: should error, once operand type check is implemented
reveal_type(x)  # revealed: int