July 2017
Intermediate to advanced
398 pages
11h 54m
Chinese
Content preview from Python数据处理
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Python
基础
｜
33
pprint.pprint(sys.path)
➌
➊
导入
Python
的
sys
模块。
➋
导入
Python
的
pprint
模块。
➌
将列表
sys.path
传递给
pprint.pprint
，将列表清晰易读地显示出来。
如果将字典传入
pprint.pprint
会怎么样？你应该会看到格式优美的字典输出。
2.7
小结
数据类型和容器是
Python
理解并存储数据的方式。数据类型有许多种，本章只学习了其中
重要的几种，如表
2-1
所示。
表2-1：数据类型
名称 举例
字符串
'Joker'
整数
2
浮点数
2.0
变量
animal_names
列表
['Joker', 'Simon', 'Ellie', 'Lishka', 'Fido']
字典
{'cats': 2, 'dogs': 5, 'horses': 1, 'snakes': 0}
如你所知，有些数据类型可以包含在其他数据类型之中。列表可以是许多字符串或整数，
或二者都有。变量可以是列表、字典、字符串或小数。看一下变量
animal_names
，列表也
可以是包含列表的列表。随着我们学习更多的
Python
知识，也会更深入地学习这些数据类
型、它们的工作原理，以及如何利用它们来满足我们数据处理的需求。
本章我们还学习了
Python
的内置方法，以及能用对象所做的事情。另外，我们学习了几个
简单的
Python
方法和工具。利用这些方法和工具，我们可以判断对象的数据类型及其用
途。表
2-2
对这些工具做了总结。
表2-2：辅助工具
举例 用途
type('Joker') ...
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