save project

diy.py

@@ -9,7 +9,7 @@ class Hero:
     def upgrade(self):
         self.level=self.level+1
         self.hp=self.hp+50
-        self.attack+self.attack+4
+        self.attack=self.attack+4
 yase=Hero("亚瑟",300,20)
 yase.upgrade()
 print("亚瑟的等级为:",yase.level)