'bar', -0.64266667412325, -0.442441171401282
'baz', -0.419181615269841, -0.658545964124229
'qux', 0.881124313748992, 0.36383198969179
'bar2', -1.35613767310069, -0.124014006180608
Pivoting a DataFrame in Pandas for output to CSV