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Nlargest hierarchy series pandas

print (grouped.groupby(level='yearmonth').nlargest(3).reset_index(level=0, drop=True))
yearmonth  product
201601     E          180
           A          100
           B           90
201602     F          220
           A          200
           C          120
201603     B          120
           C          110
           D          110
Name: val, dtype: int64

Source: stackoverflow.com

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