see related #5200, #4551, #4056
seem that a direct subtraction of PeriodIndexes would accomplish this,
but don't seem to support those types of ops...
This is currently an intersection (with a '-'), but want to do a timedelta like op
In [40]: pd.PeriodIndex(start='20130101',end='20130501',freq='M').sub(
pd.PeriodIndex(start='20130201',end='20130401',freq='M'))
Partially supported actuallly
In [5]: pd.PeriodIndex(start='20130101',end='20130501',freq='M').to_series()-pd.PeriodIndex(start='20130205',end='20130405',freq='M').to_series()
Out[5]:
2013-01 NaN
2013-02 0
2013-03 0
2013-04 0
2013-05 NaN
Freq: M, dtype: float64
In [6]: pd.PeriodIndex(start='20130101',end='20130201',freq='B').to_series()-pd.Period('20130101',freq='B')
TypeError: unsupported operand type(s) for -: 'int' and 'Period'
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