lib.types module

Helper utilities related to Python types.

assert_never(value)[source]

Raises an AssertionError. This function can be used to achieve exhaustiveness checking with mypy.

literal_to_list(literal)[source]

Convert a typing.Literal into a list.

Examples

>>> from typing import Literal
>>> literal_to_list(Literal['a', 'b', 'c'])
['a', 'b', 'c']

>>> literal_to_list(Literal['a', 'b', Literal['c', 'd', Literal['e']]])
['a', 'b', 'c', 'd', 'e']

>>> literal_to_list(Literal['a', 'b', Literal[1, 2, Literal[None]]])
['a', 'b', 1, 2, None]