auto save

diy1.py

 username = "python"   
 userpassword = "123456" 
-name = input("请输入用户名")
-password =  input("请输入用户密码")
-if username == name and userpassword == password:
-    print("登录成功")
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+while True:
+    name = input("请输入用户名")
+    password =  input("请输入用户密码")
+    if username == name and userpassword == password:
+        print("登录成功")
+        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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