save project

diy2.py

 username = "python"
 userpassword = "123456"
+i=3
 while True:
+    if i>0:
         name = input("请输入用户名:")
         password = input("请输入密码:")
+        i=i-1
         if name == username and password == userpassword:
             print("登录成功!")
             break
         if name!=username:
             print('用户名错误。')
+            continue
         if password!=userpassword:
             print('密码错误。')         
-
 print("欢迎来到贝尔编程!")
\ No newline at end of file