save project

diy2.py

 username = "python"
 userpassword = "123456"
+i == 3
 while True:
     name = input("请输入用户名:")
     password = input("请输入密码:")
+    i-=1
     if name == username :
         if password == userpassword :
             print("登陆成功！")
@@ -11,4 +13,6 @@ while True:
             print("密码错误！")
     else:
         print("用户名不存在！")
+    if i == 0:
+        print("")
 print("欢迎来到贝尔编程!")
\ No newline at end of file