Python中type的构造函数参数含义说明

 class ModelMetaClass(type):
     def __new__(cls,name,base,attrs):
         logging.info("cls is:"+str(cls))
         logging.info("name is:"+str(name))
         logging.info("base is:"+str(base))
         logging.info("attrs is:"+str(attrs))
         return type.__new__(cls,name,base,attrs)
         pass
     pass
 
 class Model(dict):
     __metaclass__ = ModelMetaClass
     def __init__(self):
         pass
     pass
 
 def main():
     m=Model()
 
 if __name__ == '__main__':
     main()

 INFO:root:cls is:
 INFO:root:name is:Model
 INFO:root:base is:( ,)
 INFO:root:attrs is:{'__module__': '__main__', '__metaclass__': , '__init__': }