Get count of value for 15 min periods

I have a DataFrame with a DateTimeIndex. I would like to get the count of all different (integer) values for column col1 for each 15 min period.

I have looked at groupby and count but this doesn't seem to work.

Any suggestion appreciated!


result = df.groupby(pd.TimeGrouper('15Min')['col1'].apply(lambda x: x.value_counts()))

should do the trick.

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