python - Pandas Dataframe label selection -

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can tell me why df['2005-5-31'] trigger keyerror exception?

rng = pd.date_range('2005', '2012', freq='m') df = pd.dataframe(randn(len(rng), 3), rng, ['x', 'y', 'z']) df.head()  # works df.ix['2005-5-31'] df['2005-5-31':'2005-5-31']  # gives keyerror: u'no item named 2005-5-31' df['2005-5-31']

follow code using df['2000-01-01'] works.

#multiple rows on single date rng = pd.date_range('2000-01-01', '2000-01-3', freq='8h') df = pd.dataframe(randn(len(rng), 3), rng, ['x', 'y', 'z'])  # works df['2000-01-01']                             x    y   z 2000-01-01 00:00:00 -0.227981    1.927932   -0.518947 2000-01-01 08:00:00  0.486063   -1.255186    0.375075 2000-01-01 16:00:00 -2.313950    0.654384    1.111493

df['2005-5-31'] returns column named: 2005-5-31. columns named x,y,z. , because don't have date column, giving error!

now .ix[] method works because takes 2 inputs, first input being row index. have row index '2005-5-31' works!


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