save project

diy2.py

+z=3
 username = "1"
 userpassword = "2"
 while True:
+    if z>0:
         c= input("请输入用户名:")
         d = input("请输入密码:")
+        z-=1
         if c == username and d == userpassword:
             print("登录成功!")
             break
@@ -10,4 +13,7 @@ while True:
             print("账号名不存在，请重新输入")
         if userpassword!=d:
             print("密码输入有误，请重新输入")
+    else:
+        print("次数已用完")
+        exit()
 print("欢迎来到贝尔编程!")
\ No newline at end of file