auto save

demo.py

+class Hero:
+    def __init__(self,name,hp,attack):
+        self.name=name
+        self.level=1
+        self.hp=hp
+        self.attack=attack
+    def upgrade(self):
+        self.level += 1
+        self.hp += 50
+        self.attack += 4
+yase=Hero('亚瑟',300,20)
+yase.upgrade()
+yase.upgrade()
+
+print(yase.hp)
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