在类内调用__dict__，会返回类内所有变量和函数的dict。 例
class Python: a = 1 b = 5.1 def _init(self): return 100 def wdx(self): return Python.__dict__.items() py = Python() dic = py.wdx() print(dic) ==========结果========= dict_items([('__module__', '__main__'), ('a', 1), ('b', 5.1), ('_init', <function Python._init at 0x0000021A21A0D598>), ('wdx', <function Python.wdx at 0x0000021A38B3B268>), ('__dict__', <attribute '__dict__' of 'Python' objects>), ('__weakref__', <attribute '__weakref__' of 'Python' objects>), ('__doc__', None)])