为什么我这里的if语句不执行呀!
userAll = []
paswdAll = []
user = input('请输入您的用户名:')
pwd = input('请输入您的密码:')
for item in userAll:
if item == user:
i = 0
for item1 in paswdAll:
if item1 == pwd and paswdAll[i] == item1:
print('登录成功!!')
i += 1
else:
print('密码错误')
else:
print('该用户不存在,请先注册!')
user = input('请输入您的用户名:')
pwd = input('请输入您的密码:')
userAll.append(user)
paswdAll.append(pwd)
```python
```