BUG: iat/at broken for PeriodIndex

[cpcloud]

In [9]: s = Series(randn(10), index=period_range('1/1/2001', periods=10))

In [10]: s
Out[10]:
2001-01-01   -0.677
2001-01-02    0.058
2001-01-03   -1.200
2001-01-04   -1.152
2001-01-05   -2.646
2001-01-06   -1.068
2001-01-07   -1.232
2001-01-08    0.452
2001-01-09    0.476
2001-01-10   -1.387
Freq: D, dtype: float64

In [11]: s.iat[0] # throws a KeyError

[cpcloud]

i guess this is ambiguous tho since period objects are really just fancy ints, still should work tho

@jreback should the conversion happen in the engine get_value in index.pyx or should there be check in the ScalarIndexer class for the ordinal attribute

[jreback]

no...the problem here is that the index is int based, so it tries to look up based the key (which is wrong)

i'll look at this