1 # 注册
2 username = input('请输入你要注册的用户名：')
3 password = input('请输入你要注册的密码：')
4 with open('0802.txt',mode='w',encoding='utf-8') as a:
5 a.write('{}\n{}'.format(username,password))
6 print('恭喜您，注册成功')
7
8 # 登录
9 lis = []
10 i = 0
11 while i < 3:
12 usn = input('请输入你的用户名：')
13 pwd = input('请输入你的密码：')
14 with open('0802.txt',mode='r+',encoding='utf-8') as b:
15 for line in b:
16 lis.append(line)
17 if usn == lis[0].strip() and pwd == lis[1].strip():
18 print('登录成功')
19 break
20 else:print('账号和密码错误')
21 i+=1
ps: strip()可以去除空格，换行符等
