November 2022
Intermediate to advanced
392 pages
10h 8m
Chinese
Content preview from Python算法交易
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Python
、
NumPy
、
matplotlib
和
pandas
｜
365
按索引位置选择两行。
按索引位置从一列中选择两行值。
使用“点”查找语法来选择列。
按索引值选择一行。
通过索引值和列名选择单个数据点。
实现向量化算术运算。
布尔运算
基于布尔运算的数据选择也是
pandas
的强项。
In [174]: df['no3'] > 0.5
Out[174]: 2022-01-31 False
2022-02-28 False
2022-03-31 True
2022-04-30 False
2022-05-31 False
2022-06-30 True
2022-07-31 False
2022-08-31 True
2022-09-30 True
2022-10-31 True
Freq: M, Name: no3, dtype: bool
In [175]: df[df['no3'] > 0.5]
Out[175]: no1 no2 no3
2022-03-31 -0.267572 -0.459848 0.959027
2022-06-30 -1.825116 -0.336949 0.676227
2022-08-31 -0.652803 ...
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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.