Selection in pandas using query
The query method in pandas DataFrames provides some flexibility in code, and potential speedups using numexpr.
The query method in pandas DataFrames provides some flexibility in code, and potential speedups using numexpr.
This is the fifth post in a series on indexing and selecting in pandas. If you are jumping in the middle and want to get caught up, here’s what has been discussed so far: Basic indexing, selecting by label and location Slicing in pandas Selecting by boolean indexing Selecting by callable Once the basics were …
In pandas, you can use callables where indexers are accepted. It turns out that can be handy for a pretty common use case.
This is the third post in the series on indexing and selecting data in pandas. If you haven’t read the others yet, see the first post that covers the basics of selecting based on index or relative numerical indexing, and the second post, that talks about slicing. In this post, I’m going to talk about boolean …