auto save

8.py

+username="gvgvgvgv"
+userpassword="123456"
+while True:
+    name=input("请输入用户名")
+    password=input("请输入密码")
+    if username==name and userpassword==password:
+        print("登陆成功")  
+        break
+    if name!=username:
+        print("用户名不存在")  
+    if password!=userpassword:
+        print("密码错误，请重新登录")
+print("欢迎")