March 2022
Intermediate to advanced
522 pages
13h 52m
Chinese
Content preview from Python语言及其应用（第2版）
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162
｜
第
10
章
>>> def who_says(obj):
... print(obj.who(), 'says', obj.says())
...
>>> who_says(hunter)
Elmer Fudd says I'm hunting wabbits.
>>> who_says(hunted1)
Bugs Bunny says What's up, doc?
>>> who_says(hunted2)
Daffy Duck says It's rabbit season!
>>> who_says(brook)
Brook says Babble
这种行为有时被称作
鸭子类型
（
duck typing
），该名称源自以下这句俗语。
如果它像鸭子一样走路，像鸭子一样叫，那它就是一只鸭子。
——一位智者
我们有什么资格去争论关于鸭子的至理名言呢？图
10-1
是两只可爱的橡皮鸭。
图 10-1：鸭子类型可不是看着键盘打字（Duck typing is not hunt-and-peck）
6
10.8
魔术方法
你现在已经能创建和使用基本对象了。本节所介绍的内容可能会让你大吃一惊（指好的
方面）。
注
6
：
typing
也有“打字”的意思。——译者注
对象和类
｜
163
当输入像
a = 3 + 8
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