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directives_type_checking.py

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1"""
2Tests the typing.TYPE_CHECKING constant.
3"""
4
5# Specification: https://typing.readthedocs.io/en/latest/spec/directives.html#type-checking
6
7from typing import TYPE_CHECKING, assert_type
8
9
10if not TYPE_CHECKING:
11 a: int = "" # This should not generate an error
13if TYPE_CHECKING:
14 b: list[int] = [1, 2, 3]
15else:
16 b: list[str] = ["a", "b", "c"]
18assert_type(b, list[int])