DataFrame.ix[tup, list] throws exception

[changhiskhan]

per pydata email:

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I created a dataframe with multi index like this:
a b c
y m d
2000 1 1 1 2 3
2 7 8 9
3 4 5 6

...

it doesn't work to do this: df.ix[(2000,1,1), ['a','b']]

it gives KeyError = 1

in _NDFrameIndexer._getitem_tuple, the return value of the first ix._getitem_axis(key, axis=i) call returns a Series so the second call with axis=1 fails with KeyError=1