python 类中 __dict__ 方法 和 dir() 方法的区别

代码：

#!/usr/bin/env python
#-*- coding:utf-8 -*-


class A(object):

    def __init__(self,a,b):
        self.a = a
        self.b = b
        self.ss = (1, 2)
        self.ll = [1, 2]

    def add(self):
        return (1,)


# 测试
if __name__ == "__main__":

    demo = A(1, 2)
    
    print('33[32m 打印 __dict__ 33[0m')
    for k,v in demo.__dict__.items():
        print(k,v)

    print('33[32m 打印 dir(demo) 33[0m')
    print(dir(demo))

输出结果：

打印 __dict__ 
a 1
b 2
ss (1, 2)
ll [1, 2]
 打印 dir(demo) 
['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', 
'__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'a', 'add', 'b', 'll', 'ss']