python set index

# assignment copy
df = df.set_index('month')

# or inplace
df.set_index('month', inplace=True)

#      year   sale  month            month  year   sale
#  0   2012   55    1                1      2012   55
#  1   2014   40    4       =>       4      2014   40
#  2   2013   84    7                7      2013   84
#  3   2014   31    10               10     2014   31

class indexed_array:
    def __getitem__(self, indices):
        # convert a simple index x[y] to a tuple for consistency
        if not isinstance(indices, tuple):
            indices = tuple(indices)

        # now handle the different dimensional cases
        ...