DEPR: freq ''2BQ-SEP" for to_period should raise an error #56899
Description
on the latest main this
>>> rng = pd.date_range('01-Jan-2012', periods=8, freq='2BQ-SEP') <stdin>:1: FutureWarning: 'BQ-SEP' is deprecated and will be removed in a future version, please use 'BQE-SEP' instead. >>> rng.to_period() works as
PeriodIndex(['2012Q1', '2012Q3', '2013Q1', '2013Q3', '2014Q1', '2014Q3', '2015Q1', '2015Q3'], dtype='period[2Q-DEC]') While before it raised an error
AttributeError: 'pandas._libs.tslibs.offsets.BQuarterEnd' object has no attribute '_period_dtype_code'