July 2019
Intermediate to advanced
365 pages
8h 13m
Chinese
Content preview from Python机器学习手册：从数据预处理到深度学习
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.
3.12
删除重复行
｜
49
#
删除一些行，查看输出结果的前两行
dataframe[dataframe['Sex'] != 'male'].head(2)
Name PClass Age Sex Survived SexCode
0 Allen, Miss Elisabeth Walton 1st 29.0 female 1 1
1 Allison, Miss Helen Loraine 1st 2.0 female 0 1
讨论
平心而论，使用
drop
方法是个不错的选择（比如，使用
df.drop([0, 1], axis=0
来删
除前两行），而更实用的方式是在
df[]
中插入布尔条件，因为可以利用条件语句来删除
一行或一次删除多行（这种情况更常见）。
使用布尔条件通过匹配唯一值的方式可以轻松删除一行 ：
#
删除一行，查看输出结果的前两行
dataframe[dataframe['Name'] != 'Allison, Miss Helen Loraine'].head(2)
Name PClass Age Sex Survived SexCode
0 Allen, Miss Elisabeth Walton 1st 29.0 female 1 1
2 Allison, Mr Hudson Joshua Creighton 1st 30.0 male 0 0
甚至可以通过这种方式根据行的下标来删除一行 ：
#
删除一行，查看输出结果的前两行
dataframe[dataframe.index != 0].head(2) ...
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.