newusers = []
users = {
    'XXX': [] ,
    'YYY': [],
    }
for i in range(110,112):
    print(i)   
    users['XXX'] = i
    users['YYY'] = i + 100
    print('this is users', users, )
    print('this is newusers befor appended', str(i), newusers)
    newusers.append(users)
    print('this newusers appended ', str(i), newusers)
    print('\n')
执行结果如下
110
this is users {'XXX': 110, 'YYY': 210}
this is newusers befor appended 110 []
this newusers appended  110 [{'XXX': 110, 'YYY': 210}]


111
this is users {'XXX': 111, 'YYY': 211}
this is newusers befor appended 111 [{'XXX': 111, 'YYY': 211}]      这里为什么不是[{'XXX': 110, 'YYY': 210}] ？
this newusers appended  111 [{'XXX': 111, 'YYY': 211}, {'XXX': 111, 'YYY': 211}]  我期待的结果是 [{'XXX': 110, 'YYY': 210}, {'XXX': 111, 'YYY': 211}]
  那里错了 ？

[此贴子已经被作者于2019-3-23 11:11编辑过]

# newusers.append(users) 这一句用下一句代替
newusers.append(users.copy())

谢谢，明白了。原来append和赋值是一样的。
还明白了浅拷贝和深拷贝。