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Often we need to change sampling of a time series data set that we are working with. Imagine that you are working with time series that was sampled in 15 minutes chunks and need to do analysis/ forecast with different sampling e.g. daily , 3 hours, quarterly, yearly etc… There is method resample in pandas that is perfect for resampling time series. You need to make sure that object has a datetime-like index and provide a offset rule (alias).

Below is short example :

Links:

More info on resample
Info on offset strings