save project

diy6.py

-username="454380"
+username="python"
 userpassword="123456"
-name = input("请输入用户名")
-password = input("请输密码")
-if name == username and password == userpassword:
+while True:
+    name = input("请输入用户名")
+    password = input("请输密码")
+    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("欢迎来到贝尔世界")
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