save project

diy.py

-
+username = "python"
+userpassword = "123456"
+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
+    elif name!=username:
+        print("用户名不存在，请重新输入!")
+    else:
+        print("密码输入有误，请重新输入!")
+print("欢迎来到贝尔编程")