Pandas: Combine TimeGrouper with another Groupby argument

Question

I have the following DataFrame:

df = pd.DataFrame({
\'Branch\' : \'A A A A A B\'.split(),
\'Buyer\': \'Carl Mark Carl Joe Joe Carl\'.split(),
\'Quantity\': [         


        

Answer 1

You can now use a TimeGrouper with another column (as of IIRC pandas version 0.14):

In [11]: df1 = df.set_index('Date')

In [12]: g = df1.groupby([pd.TimeGrouper('20D'), 'Branch'])

In [13]: g.sum()
Out[13]:
                            Quantity
Date                Branch
2013-01-01 13:00:00 A              4
2013-09-18 13:00:00 A             13
2013-11-17 13:00:00 A              9
                    B              3