October 2017
Intermediate to advanced
532 pages
16h 10m
English
Content preview from Pandas Cookbook
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How it works...
The resample method, by default, works implicitly with a DatetimeIndex, which is why we set it to REPORTED_DATE in step 1. In step 2, we created an intermediate object that helps us understand how to form groups within the data. The first parameter to resample is the rule determining how the Timestamps in the index will be grouped. In this instance, we use the offset alias W to form groups one week in length ending on Sunday. The default ending day is Sunday, but may be changed with an anchored offset by appending a dash and the first three letters of a day of the week.
Once we have formed groups with resample, we must chain a method to take action on each of them. In step 3, we use the size method to count the number of crimes ...
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