auto save

diy1.py

 username = "python"   
 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！")