Metaclass:https://www.cnblogs.com/ArsenalfanInECNU/p/9036407.html
还有ORM:https://www.cnblogs.com/ArsenalfanInECNU/p/9100874.html
super函数补充:https://www.runoob.com/python/python-func-super.html
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520bv
Metaclass:https://www.cnblogs.com/ArsenalfanInECNU/p/9036407.html
还有ORM:https://www.cnblogs.com/ArsenalfanInECNU/p/9100874.html