For example, you have the following code in ordered_set_stubs_test.py file:
from ordered_set import OrderedSet
# noinspection PyPep8Naming
def receives_OrderedSet_int(ordered_set: 'OrderedSet[int]') -> 'OrderedSet[int]':
return ordered_set
receives_OrderedSet_int(OrderedSet(['ololo']))Run mypy to check the code and check that it returns an error:
$ mypy ordered_set_stubs_test.py
ordered_set_stubs_test.py:10: error: List item 0 has incompatible type "str"; expected "int"
In Python 3.7 you can even drop quotes:
from __future__ import annotations
from ordered_set import OrderedSet
# noinspection PyPep8Naming
def receives_OrderedSet_int(ordered_set: OrderedSet[int]) -> OrderedSet[int]:
return ordered_set
receives_OrderedSet_int(OrderedSet(['ololo']))