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mbarkhau/kinds_of_namedtuple_parameters.py

Last active September 7, 2018 14:43
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kinds_of_namedtuple_parameters.py
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kinds_of_namedtuple_parameters.py
# copied as literally as possible from here
# https://mypy.readthedocs.io/en/latest/kinds_of_types.html#the-type-of-class-objects
from typing import NamedTuple, TypeVar, Type
class Env(NamedTuple):
log_level: str = "DEBUG"
N = TypeVar("N", bound=NamedTuple)
def getenv(env_type: Type[N]) -> N:
return env_type(...)
env = getenv(Env)
# $ mypy
# src/myenv/__init__.py:18: error: Value of type variable "N" of "getenv" cannot be "Env"
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