November 2023
Intermediate to advanced
512 pages
11h 53m
Chinese
Content preview from 利用 Python 进行数据分析：原书第 3 版
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.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.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.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.
数据分析案例
|
425
图 13-10：使用“ Lesley 式”名字的男女比例随时间的变化趋势
13.4 USDA
食品数据库
美国农业部（
US Department of Agriculture
，
USDA
）制作了一份有关食物营养信
息的数据库。程序员
Ashley Williams
制作了该数据的
JSON
版本。其中的记录如下
所示：
426
|
第
13
章
每种食物都带有若干标识性属性，以及两个有关营养成分和分量的列表。这种形式的数
据不是很适合分析工作，因此我们需要做一些规整化以使其具有更好的形式。
你可以用选择任意
JSON
库将其加载到
Python
中。我用的是
Python
内置的 json
模块：
db 中的每个条目都是一个字典，含有某种食物的全部数据。字段 "nutrients" 是一个字
典列表，其中每个字典对应一种营养成分：
在将字典列表转换为
DataFrame
时，我们可以指定一个需要提取的字段列表。这里，我
们将提取食物的名称、分类、
ID
以及制造商等信息：
数据分析案例
|
427
通过 info.info() ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.