save project

diy1.py

 username="python"
 userpassword="142857"
-yourname=input("请输入您的用户账号：")
-yourpassword=input("请输入您的用户密码：")
-if yourname==username and yourpassword==userpassword:
-    print("登录成功")
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+while True:
+    yourname=input("请输入您的用户账号：")
+    yourpassword=input("请输入您的用户密码：")
+    if yourname==username and yourpassword==userpassword:
+        print("登录成功")
+        break
+    print("用户名或账号密码输入错误")
+print("欢迎来到贝尔编程！")
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