Python __ __

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slots

class People(object):
    __slots__ = ("name", "age")

    def __init__(self, name, age):
        self.name = name
        self.age = age
        self.gender = 1


if __name__ == '__main__':
    people = People("name", "20")

限制class的属性：上面的类中只能有属性name 和 age 而不能有gender

Traceback (most recent call last):
  File "D:/Project/PycharmProject/PythonProject/learn/oo_demo.py", line 11, in <module>
    people = People("name", "20")
  File "D:/Project/PycharmProject/PythonProject/learn/oo_demo.py", line 7, in __init__
    self.gender = 1
AttributeError: 'People' object has no attribute 'gender'