October 2017
Intermediate to advanced
532 pages
16h 10m
English
Content preview from Pandas Cookbook
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How it works...
The sort_values method can nearly replicate nlargest by chaining the head method after the operation, as seen in step 2. Step 3 replicates nsmallest by chaining another sort_values and completes the query by taking just the first five rows with the head method.
Take a look at the output from the first DataFrame from step 1 and compare it with the output from step 3. Are they the same? No! What happened? To understand why the two results are not equivalent, let's look at the tail of the intermediate steps of each recipe:
>>> movie2.nlargest(100, 'imdb_score').tail()
>>> movie2.sort_values('imdb_score', ascending=False) \ .head(100).tail() ...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,
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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.
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