I have a pandas DataFrame like the following:
                  c  d
a  {'e': 1, 'f': 2}  2
b  {'e': 3, 'f': 4}  5
I would now like to expand the dictionaries in the cells to two sub-columns in a multiindex dataframe, like so:
     c          d
     e   f
a    1   2      2
b    3   4      5
How do I best do this?
