pydata/pandas — pull request #4394 by jreback (2013-07-28 23:42:30+00:00)
Title: BUG: Fix .iat indexing with a PeriodIndex GH4390

closes #4390

Interesting fixed this as well (only affects ``get``)
```
In [1]: s = Series(randn(10),date_range('20130101',periods=10))

In [2]: s[0]
Out[2]: 1.1755210838393764

In [3]: s
Out[3]:
2013-01-01 1.175521
2013-01-02 0.007910
2013-01-03 -1.235595
2013-01-04 0.478245
2013-01-05 -0.140616
2013-01-06 -2.317585
2013-01-07 0.609555
2013-01-08 1.204914
2013-01-09 -0.589893
2013-01-10 -2.017237
Freq: D, dtype: float64

In [4]: s[-1]
Out[4]: -2.0172365222181257

In [5]: s[-5]
Out[5]: -2.3175847263447964
```

This was before this PR returning None (while ``s[-1]`` worked)
```
In [6]: s.get(-5)
```