auto save

login.py

+username="python"
+userpassword="123456"
+while True:
+    name=input("请输入账号：")
+    password=input("请输入密码：")
+    if name==username and password==userpassword:
+        print("登录成功！")
+        break
+    if name!=username:
+        print("您输入的账号错误请重新输入！")
+    if password!=userpassword:
+        print("您输入的密码错误请重新输入！")
+print("欢迎来到贝尔编程！")
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