Using .loc with a MultiIndex in pandas?

Question

Does anyone know if it is possible to use the DataFrame.loc method to select from a MultiIndex? I have the following DataFrame and would like to be able to access the values

Answer 1

Try the cross-section indexing:

In [68]: df.xs('at', level='QGram', drop_level=False).loc[[1,4]]
Out[68]: 
        Char  Dwell  Flight  ND_Offset  Offset
QGram                                         
at    1    t    180       0   0.108363       5
      4    a     20     180   0.000000       0

Answer 2

If you are on version 0.14, you can simply pass a tuple to .loc as below:

df.loc[('at', [1,3,4]), 'Dwell']