auto save

diy2.py

 username = "python"
 username = "python"
 userpassword = "123456"
 userpassword = "123456"
+name = input("请输入用户名:")
+password = input("请输入密码:")
 while True:
 while True:
-    name = input("请输入用户名:")
-    password = input("请输入密码:")
     if name == username and password == userpassword:
     if name == username and password == userpassword:
-        print("登录成功!")
-    print("用户名和密码错误!请重新输入")
+        print("登录成功")
+        break
+    if username != name:
+        print("用户名错误，请重新输入！")
+        name = input("请输入用户名:")
+    if userpassword != password:
+        print("密码错误，请重新输入！")
+        password = input("请输入密码:")
 print("欢迎来到贝尔编程!")
 print("欢迎来到贝尔编程!")
\ No newline at end of file