selecting from multi-index pandas

Question

I have a multi-index data frame with columns 'A' and 'B'.

Is there is a way to select rows by filtering on one column of the multi-index without resetting the index to a single column index?

For Example.

# has multi-index (A,B)

df

#can I do this? I know this doesn't work because the index is multi-index so I need to     specify a tuple

df.ix[df.A ==1]

Answer 1

Use DataFrame.loc:

>>> df.loc[1]