The dreaded SettingWithCopy warning when doing chained indexing

Selecting Subsets of Data in Pandas: Part 4

This is the fourth and final part of the series “Selecting Subsets of Data in Pandas”. Pandas offers a wide variety of options for subset selection, which necessitates multiple articles. This series is broken down into the following topics.

1. Selection with [], .loc and .iloc
2. Boolean indexing
3. Assigning subsets of data
4. How NOT to select subsets of data

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Learning what not to do

In all programming languages, and especially pandas, the number of incorrect or inefficient ways to complete a task heavily outnumbers the efficient or idiomatic ones. The term idiomatic refers to code that is efficient, easy to understand…