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Update resample.py #59353

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18 changes: 18 additions & 0 deletions pandas/core/resample.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1617,6 +1617,24 @@ class DatetimeIndexResampler(Resampler):
def _resampler_for_grouping(self) -> type[DatetimeIndexResamplerGroupby]:
return DatetimeIndexResamplerGroupby

def _get_resampler_for_grouping(self, groupby, how, fill_method, limit, kind):
"""
Return a resampler for groupby object.
"""
self.groupby = groupby
self._on = getattr(groupby, 'on', None)
if self._on is not None:
groupby._selected_obj = groupby._selected_obj.reset_index(drop=True).set_index(self._on)
return self._get_resampler(how, fill_method, limit, kind)

def _get_resampler(self, how, fill_method, limit, kind):
"""
Return a resampler for non-groupby object.
"""
if self._on is not None:
self._selected_obj = self._selected_obj.reset_index(drop=True).set_index(self._on)
return super()._get_resampler(how, fill_method, limit, kind)

def _get_binner_for_time(self):
# this is how we are actually creating the bins
if isinstance(self.ax, PeriodIndex):
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