类有一个__dict__字典属性,保存了当前类的每一个成员,举例如下:
>>> class A: def __init__(self,value): self.value=value def printValue(self): print(self.value) >>> A.__dict__ mappingproxy({'__module__': '__main__', '__init__': <function A.__init__ at 0x101162e18>, 'printValue': <function A.printValue at 0x1015af510>, '__dict__': <attribute '__dict__' of 'A' objects>, '__weakref__': <attribute '__weakref__' of 'A' objects>, '__doc__': None})