def _param_count_of_type(self, type_: Optional[Type]) -> int:
"""
Return the number of parameters that have the specified type.
:param type_: The type, whose occurrences should be counted.
:return: The number of occurrences.
"""
count = 0
if not type_:
return 0
for var_ref in self.args:
if is_assignable_to(var_ref.variable_type, type_):
count += 1
for _, var_ref in self.kwargs.items():
if is_assignable_to(var_ref.variable_type, type_):
count += 1
return count
def test_is_assignable_to(from_type, to_type, result):
assert is_assignable_to(from_type, to_type) == result
