auto save

diy2.py

+username="春节"
+userpassword="1245"
+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
+    if name!=username:
+        print("用户名输入错误")
+    if password!=userpassword:
+        print("密码输入错误")
+print("欢迎来到到贝尔编程")
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