save project

diy2.py

+username = "648"
+userpassword = "olso648"
+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
+    else:
+        if name==username and password!=userpassword:
+            print("账号错误")
+        else:
+            if name!=username and password==userpassword:
+                print("密码错误")
+            else:
+                if name!=username and password!=userpassword:
+                    print("你“输”对了。congratulation。")
+print("欢迎来到648编程!")
+