October 2017
Intermediate to advanced
532 pages
16h 10m
English
Content preview from Pandas Cookbook
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Preserving Series with the where method
Boolean indexing necessarily filters your dataset by removing all the rows that don't match the criteria. Instead of dropping all these values, it is possible to keep them using the where method. The where method preserves the size of your Series or DataFrame and either sets the values that don't meet the criteria to missing or replaces them with something else.
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