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in groupby sorting index when length of groupings is one #27386

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in groupby sorting index when length of groupings is one #27386

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5 changes: 4 additions & 1 deletion pandas/core/groupby/groupby.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2408,7 +2408,10 @@ def _reindex_output(self, output):
if groupings is None:
return output
elif len(groupings) == 1:
return output
if self.sort:
return output.sort_index()
else:
return output

# if we only care about the observed values
# we are done
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