save project

diy.py

 username = 'python'
 username = 'python'
 userpassword = '123456'
 userpassword = '123456'
 
 
-name = input("请输入用户名：")
-password = input("请输入密码：")
-
-if name == username and password == userpassword:
-    print("登陆成功")
+while True:
+    name = input("请输入用户名：")
+    password = input("请输入密码：")
+    if name == username and password == userpassword:
+        print("登陆成功")
+        break
+    print("用户名和密码错误！请重新输入")
+print("欢迎来到贝尔编程！")
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