November 2022
Intermediate to advanced
392 pages
10h 8m
Chinese
Content preview from Python算法交易
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处理金融数据
｜
83
3.4.1
存储
DataFrame
对象
通过
pandas HDFStore
封装包，可以把整个
pandas DataFrame
对象存储起来，它实
现了
HDF5
（
http://hdfgroup.org
）二进制存储标准。它允许通过一个步骤将完整的
DataFrame
对象转储到基于文件的数据库对象中。为了解释如何实现，第一步是创
建足够大小的样本数据集。此处生成的
DataFrame
的大小约为
420 MB
：
In [62]: %time data = generate_sample_data(rows=5e6, cols=10).round(4)
CPU times: user 3.88 s, sys: 830 ms, total: 4.71 s
Wall time: 4.72 s
In [63]: data.info()
<class 'pandas.core.frame.DataFrame'>
DatetimeIndex: 5000000 entries, 2021-01-01 00:00:00 to 2030-07-05
05:19:00
Freq: T
Data columns (total 10 columns):
# Column Dtype
--- ------ -----
0 No0 float64
1 No1 float64
2 No2 float64
3 No3 ...
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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.