python intrduce
class Fish:def eat(self, food):
if food is not None:
self.hungry=False
class User:
def __init__(myself, name):
myself.name = name
#构造Fish的实例：
f=Fish()
#以下两种调用形式是等价的：
Fish.eat(f, "earthworm")
f.eat("earthworm")
u = User('username')
u.name
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