Python-操作方法

Question

初学者的问题：

1. 有人可以向我解释为什么change_pos方法在以下代码中不起作用，并且没有将坐姿从“真”更改为“假”（或者相反）吗？ p>

2. 如何在一行代码中对整个实例change_pos实施此(p1, p2)方法？

class Person:
    def __init__(self, name, Personality, isSitting):
        self.name=name
        self.Personality = Personality
        self.isSitting=isSitting 

    def sit_down(self):
        self.isSitting=True

    def stand_up(self):
        self.isSitting=False

    def change_pos(self):
        if (self.isSitting==True):
            self.isSitting==False
        else: 
            self.isSitting==True

p1=Person("Alice", "aggressive", False)
p2=Person("Becky", "talkative", True)

print (p1.name,'is', p1.isSitting ,'about sitting')
print (p2.name,'is', p2.isSitting ,'about sitting')

p2.change_pos()

print (p1.name,'is', p1.isSitting ,'about sitting')
print (p2.name,'is', p2.isSitting ,'about sitting')

输出为：

Alice is False about sitting
Becky is True about sitting
Alice is False about sitting
Becky is True about sitting