Pandas DateOffset, Periods and tslib.period_ordinal -

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i trying understand relationship in pandas between dateoffset, periods , tslib.period_ordinal.

when create new period using: pd.period("2013-12", freq="q-dec"), see "q-dec" resolved base of 2000, base in addition components of datetime parsed date string passed tslib.period_ordinal returns 175.

where if anywhere dateoffset come in? meaning of base? there docs on period_ordinal?

i looking add new frequencies, such 52–53-week fiscal year (see: https://github.com/pydata/pandas/issues/4511) , wondering start.


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