auto save

bj.py

+类是一个群体的统称，对象是一个具体的个体。
+通常把类属性设置在类的__init__()方法里
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diy.py

-class hero:
+class Hero:
     def __init__(self):
         self.level=1
         self.hp=300
-        self.attack=2000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
+        self.attack=20
+yase=Hero()
+print(yase.hp)
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