pandas.core.window.Window.sum¶
-
Window.
sum
(*args, **kwargs)[source]¶ Calculate window sum of given DataFrame or Series.
Parameters: *args, **kwargs
For compatibility with other window methods. Has no effect on the computed value.
Returns: Series or DataFrame
Same type as the input, with the same index, containing the window sum.
See also
Series.sum
- Reducing sum for Series.
DataFrame.sum
- Reducing sum for DataFrame.
Examples
>>> s = pd.Series([1, 2, 3, 4, 5]) >>> s 0 1 1 2 2 3 3 4 4 5 dtype: int64
>>> s.rolling(3).sum() 0 NaN 1 NaN 2 6.0 3 9.0 4 12.0 dtype: float64
>>> s.expanding(3).sum() 0 NaN 1 NaN 2 6.0 3 10.0 4 15.0 dtype: float64
>>> s.rolling(3, center=True).sum() 0 NaN 1 6.0 2 9.0 3 12.0 4 NaN dtype: float64
For DataFrame, each window sum is computed column-wise.
>>> df = pd.DataFrame({"A": s, "B": s ** 2}) >>> df A B 0 1 1 1 2 4 2 3 9 3 4 16 4 5 25
>>> df.rolling(3).sum() A B 0 NaN NaN 1 NaN NaN 2 6.0 14.0 3 9.0 29.0 4 12.0 50.0