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DOC Added that DatetimeIndex needs to be ordered on first() #52596

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Apr 11, 2023
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2 changes: 1 addition & 1 deletion pandas/core/generic.py
Original file line number Diff line number Diff line change
Expand Up @@ -9020,7 +9020,7 @@ def first(self, offset) -> Self:
"""
Select initial periods of time series data based on a date offset.

When having a DataFrame with dates as index, this function can
For a DataFrame with a sorted DatetimeIndex, this function can
select the first few rows based on a date offset.

Parameters
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