Descriptors in Python

class TypedField:

    def __init__(self, _type, _name):
        self._type = _type
        self._name = f'_{_name}'

    def __set__(self, instance, value):
        if not isinstance(value, self._type):
            raise TypeError("Only %s type is supported, you provided %s" % (self._type, type(value)))
        setattr(instance, self._name, value)

    def __get__(self, instance, owner):
        return getattr(instance, self._name)


class PythonUZ:
    member_count = TypedField(int, 'member_count')
    title = TypedField(str, 'title')


pyuz = PythonUZ()
pyuz.member_count = 1914
print(pyuz.member_count)
pyuz.title = 42  # raises TypeError as we provided int instead of str