save project

diy2.py

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