March 2022
Intermediate to advanced
522 pages
13h 52m
Chinese
Content preview from Python语言及其应用（第2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.
270
｜
第
16
章
16.4.2
电子表格
电子表格，尤其是
Microsoft Excel
，是广为使用的二进制文件格式。如果把电子表格保存
为
CSV
文件
，就可以使用标准
csv
模块读取文件内容。这适用于二进制
xls
文件、
xlrd
或
tablib
（参见
16.3.7
节
）。
16.4.3 HDF5
HDF5
是一种用于多维或层次化数值数据的二进制数据格式。它主要应用于科学领域，其
中对于大型数据集（
GB
到
TB
）的快速随机访问是很常见的要求
。尽管在某些情况下，
HDF5
可以很好地代替数据库
，但出于某种原因，商业界对
HDF5
几乎一无所知。
HDF5
最适合
WORM
（
write once/read
many
，一次写入
/
多次读取）应用，这种应用无须担心数
据库冲突。下面两个模块也许能派上用场。
•
h5py
是一个功能完善的低层接口。
•
PyTables
较为高级，具有与数据库类似的特性。
第
22
章会从
Python
的科学应用方面讨论这两个问题
。如果你需要存储和检索大量的数
据，并且愿意考虑一些非常规之选以及通常的数据库解决方案，那么不妨尝试一下
HDF5
。
Million Song dataset
就是一个很好的例子
，其可下载歌曲数据就采用了
HDF5
格式和
SQLite
格式。
16.4.4 TileDB
HDF5
的最新“继任者”是
TileDB
，用于密集或备用阵列存储。可以运行
pip install
tiledb
安装
Python
接口（其中包括
TileDB
库本身）。它的主要用途在于科学数据及应用。
16.5
关系数据库
关系数据库问世仅
40
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.