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Python for Data
Unit 9 · Time Series
Dates as dates, and the questions only an ordered index can answer.
1
Parsing Dates
A date read from a file is text until you say otherwise.
2
Date Parts
Year, month and weekday are columns you can group by.
3
A Datetime Index
Putting time on the index unlocks slicing by period.
4
Resampling
Group by time period without building the key yourself.
5
Rolling Windows
Smoothing a noisy series to see the shape underneath.
6
Change Over Time
Differences and growth rates, and the row that has neither.
