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.
数据规整：连接、联合和重塑
|
245
参数 说明
how
连接方式
，"inner""outer""left""right"
其中之一
。
默认为
"inner"
on
用于连接的列名
。
必须存在于左右两个 DataFrame 对象中
。
如果未指定
，
且也未指定其他连接键
，
则以
left
和
right
列名的交集作为连接键
left_on left
DataFrame 中用作连接键的列
。
可以是单列列名或列名的组
right_on right
DataFrame 中用作连接键的列
left_index
将
left
的行索引用作连接键
（
如果是
MultiIndex，
则为多个键
）
right_index
将
right
的行索引用作连接键
sort
根据连接键
，
对合并后的数据进行排序
，
默认为
False
suffixes
如果列名重合
，
将字符串元组追加到列名的末尾
，
默认为
（"_x"，"_y"）。
例如
，
如果左右两个 DataFrame 对象都有
"data"，
则结果中就是
"data_
x"
和
"data_y"
copy
如果为
False，
可以在某些特殊情况下避免将数据复制到结果数据结构
中
。
默认总是复制
validate
确认是否为特定类型的合并
，
即一对一
、
一对多或多对多
。
完整细节请查
看该选项的文档字符串
indicator
添加特殊的列
_merge，
用于指明每个行的来源
。
根据每行的连接数据的
来源
，
它的值为
"left_only""left_only"
或
"both"
其中之一
。
8.2.2
根据索引合并
在某些情况下，
DataFrame
中的连接键位于其索引（行标签）中。在这种情况下 ...
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.