auto save

diy2.py

+username = "qwerty"
+userpassword = "951753"
+while True:
+    name = input("请输入用户名:")
+    password = input("请输入密码:")
+    if name == username and password == userpassword:
+        print("登录成功!")
+        break
+    if name != username:
+       print("用户名不对")
+    if password != userpassword:
+       print("密码不对")
+print("欢迎来到贝尔编程!")