Datasets:
File size: 414 Bytes
5eb110b | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | class P(Protocol):
x: int
class C:
def initialize(self) -> None:
self.x = 0
c = C()
isinstance(c, P) # False
c.initialize()
isinstance(c, P) # True
def f(x: Union[P, int]) -> None:
if isinstance(x, P):
# Static type of x is P here.
...
else:
# Static type of x is int, but can be other type at runtime...
print(x + 1)
f(C()) # ...causing a TypeError.
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