auto save

1.py

+username="python"
+userpassword='123456'
+while True:
+name=input("请输入名称")
+password=input("请输入密码")
+if name==username and password==userpassword:
+    print("输入成功")
+    break
+if name!=username:
+    print("用户名不存在，请重新输入")
+if password!=userpassword:
+    print("密码不存在，请重新输入")
+print("欢迎来到贝尔编程")
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