save project

diy3.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("登陆成功")
+        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("欢迎来到贝尔编程！")