def test_is_field_private() -> None:
"""
Tests for is_private_field_name
"""
assert is_private_field_name("_hello")
assert is_private_field_name("__hello")
assert not is_private_field_name("world")
def reason_not_overridable(value: param.Parameter) -> Optional[str]:
"""
:param value: a parameter value
:return: None if the parameter is overridable; otherwise a one-word string explaining why not.
"""
if value.readonly:
return "readonly"
elif value.constant:
return "constant"
elif is_private_field_name(value.name):
return "private"
elif isinstance(value, param.Callable):
return "callable"
return None