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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144
第 10章
对象和类
事物本非迷，迷自眼中误。
——
Elizabeth Bowen
拿件东西。对它做点儿这个，再做点儿那个。
1
——
Jasper Johns
我不止一次提到过，
Python
中的
一切，从数字到函数，都是对象。然而，
Python
通过特殊
的语法，将大多数对象机制隐藏了起来。输入
num = 7
就能创建出一个值为
7
的整数对象
并将该对象的引用赋给变量
num
。唯一需要查看对象内部的时候就是当你想创建自己的对
象或修改现有对象的行为时。在本章中你将看到如何实现这两点。
10.1
什么是对象
对象
是包含数据（变量，称为
特性
）和代码（函数，称为
方法
）的自定义数据结构。它代
表了某种具体事物的唯一实例。把对象及其方法分别想象成名词和动词。对象代表了一个
单独的事物，其方法定义了它与其他事物的交互方式。
例如，值为
7
的整数对象是一个包含加法和乘法等方法的对象，如第
3
章所述。
8
则是另
一个不同的对象。这意味着
Python
中存在
一个内建的整数类，
7
和
8
都属于该类。字符串
'cat'
和
'duck'
在
Python
中也是对象，它们拥有第
5
章介绍的
capitalize()
和
replace()
等字符串方法。
注
1
：
这两句的原文分别是：“
No objects is mysterious. The mystery is your eye.
” 和“
Take an object. Do
something to it. Do something else to it.
”，其 中 的 “
object
”和
Python
中的“对象”
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.