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DOC: document convention argument for resample() #16965

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43 changes: 43 additions & 0 deletions pandas/core/generic.py
Original file line number Diff line number Diff line change
Expand Up @@ -4826,6 +4826,8 @@ def resample(self, rule, how=None, axis=0, fill_method=None, closed=None,
label : {'right', 'left'}
Which bin edge label to label bucket with
convention : {'start', 'end', 's', 'e'}
For PeriodIndex only, controls whether to use the start or end of
`rule`
loffset : timedelta
Adjust the resampled time labels
base : int, default 0
Expand Down Expand Up @@ -4946,6 +4948,47 @@ def resample(self, rule, how=None, axis=0, fill_method=None, closed=None,
2000-01-01 00:06:00 26
Freq: 3T, dtype: int64

For a Series with a PeriodIndex, the keyword `convention` can be
used to control whether to use the start or end of `rule`.

>>> s = pd.Series([1, 2], index=pd.period_range('2012-01-01',
freq='A',
periods=2))
>>> s
2012 1
2013 2
Freq: A-DEC, dtype: int64

Resample by month using 'start' `convention`. Values are assigned to
the first month of the period.

>>> s.resample('M', convention='start').asfreq().head()
2012-01 1.0
2012-02 NaN
2012-03 NaN
2012-04 NaN
2012-05 NaN
Freq: M, dtype: float64

Resample by month using 'end' `convention`. Values are assigned to
the last month of the period.

>>> s.resample('M', convention='end').asfreq()
2012-12 1.0
2013-01 NaN
2013-02 NaN
2013-03 NaN
2013-04 NaN
2013-05 NaN
2013-06 NaN
2013-07 NaN
2013-08 NaN
2013-09 NaN
2013-10 NaN
2013-11 NaN
2013-12 2.0
Freq: M, dtype: float64

For DataFrame objects, the keyword ``on`` can be used to specify the
column instead of the index for resampling.

Expand Down