save project

diy2.py

+username="1"
+userpassword="2"
+while True:
+   name=input("输入用户名：") 
+   password=input("输入密码：")
+   if name==username and password ==userpassword:
+       print("登录成功")
+       break
+   if name !=username:
+        print("用户名不存在，请重新输入！")
+   if password !=userpassword:
+        print("密码输入有误，请重新输入！")
+   print("用户名或密码错误")
+print("欢迎滚开贝尔编程")
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