save project

diy2.py

+username = "python"
+userpassword = "123456"
+while True:
+    Q = input("输入账户：")
+    A = input("输入密码：")
+    if username == Q and userpassword == A:
+        print("登陆成功")
+        break
+    elif username != Q:
+        print("用户名输入有误，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！") 
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