class CheckString:

    def __init__(self, variable_type):

        self.variable_type = variable_type

    def __set__(self, instance, value):

        print('__set__:', value)

        self.value = "error：类型错误"

        if self.variable_type == 'str':

            self.value = value if isinstance(value, str) else "error：类型错误"

    def __get__(self, instance, owner):

        print("__get__")

        return self.value

        pass

    def __delete__(self, instance):

        pass

class InfoModel:

    name = CheckString(variable_type='str')

if __name__ == '__main__':

    info = InfoModel()

    info.name = "北门吹雪"

    print(info.name)