python - Pandas groupby object filtering -


i have pandas dataframe

df.columns index([u’car_id’,u’color’,u’make’,u’year’)]

i create new filterable object has count of each group (color,make,year);

grp = df[[‘color’,’make’,’year’]].groupby([‘color’,’make’,’year’]).size()

which return this

color   make   year     count black   honda  2011   416

i able filter it, when try this:

grp.filter(lambda x: x[‘color’]==‘black’)

i receive error

typeerror: 'function' object not iterable

how leverage 'groupby' object in order filter rows out?

i think need add reset_index , output dataframe. last use boolean indexing:

df = df[['color','make','year']].groupby(['color','make','year'])                                 .size()                                 .reset_index(name='count')   df1 = df[df.color == 'black']

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