https://blog.csdn.net/Yelena_11/article/details/53404259
https://blog.csdn.net/yelena_11/article/details/53404892
https://blog.csdn.net/Yelena_11/article/details/53404259
https://blog.csdn.net/yelena_11/article/details/53404892
class MetaCls(type): def __new__(cls, *args, **kwargs): print("in MetaCls") # return super(Meta