save project

bug.py

 username = "laz"
 userpassword = "123456"
-name = input("请输入用户名:")
-password = input("请输入密码:")
-if name ==username and password == userpassword:
+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
+    print("用户名和密码错误！请重新输入：")
+print("欢迎来到贝尔编程！")