class E:    s=''    d=[]    def __init__(self):        self.dd=[]aa=E()aa.d.append('abc')aa.dd.append('abc')aa.s+='abc'print(aa.d)print(aa.dd)print(aa.s)print('='*20)print(E.d)print(E.s)print('='*20)aa=E()aa.d.append('123')aa.dd.append('123')aa.s+='123'print(aa.d)print(aa.dd)print(aa.s)

输出：

D:\Python37\python.exe D:/study____/PIC/test_import/a/a.py['abc']['abc']abc====================['abc']====================['abc', '123']['123']123Process finished with exit code 0

结论：

可变对象：list dict set

不可变对象：tuple string int float bool