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ramalho/typevar_bounded.py

Created July 12, 2021 18:04
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typevar_bounded.py
from typing import TypeVar, TYPE_CHECKING
BT = TypeVar('BT', bound=float)
def triple2(a: BT) -> BT:
return a * 3
res2 = triple2(2)
if TYPE_CHECKING:
reveal_type(res2)
"""
Mypy output:
$ mypy typevar_bounded.py
typevar_bounded.py:6: error: Incompatible return value type (got "float", expected "BT")
typevar_bounded.py:11: note: Revealed type is "builtins.int*"
Found 1 error in 1 file (checked 1 source file)
$ mypy --version
mypy 0.910
"""
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