Selecting a row of pandas series/dataframe by integer index

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I am curious as to why df[2] is not supported, while df.ix[2] and df[2:3] both work. 

In [26]: df.ix[2]
Out[26]: 
A    1.027680
B    1.514210
C   -1.466963
D   -0.162339
Name: 2000-01-03 00:00:00

In [27]: df[2:3]
Out[27]: 
                  A        B         C         D
2000-01-03  1.02768  1.51421 -1.466963 -0.162339

I would expect df[2] to work the same way as df[2:3] to be consistent with Python indexing convention. Is there a design reason for not supporting indexing row by single integer?

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