pandas.core.window.expanding.Expanding.aggregate

Expanding.aggregate(self, func, *args, **kwargs)

Aggregate using one or more operations over the specified axis.

Parameters

funcfunction, str, list or dict

Function to use for aggregating the data. If a function, must either work when passed a Series/Dataframe or when passed to Series/Dataframe.apply.

Accepted combinations are:

• function

• string function name

• list of functions and/or function names, e.g. [np.sum, 'mean']

• dict of axis labels -> functions, function names or list of such.

*args

Positional arguments to pass to func.

**kwargs

Keyword arguments to pass to func.

Returns

scalar, Series or DataFrame

The return can be:

• scalar : when Series.agg is called with single function

• Series : when DataFrame.agg is called with a single function

• DataFrame : when DataFrame.agg is called with several functions

Return scalar, Series or DataFrame.

See also

pandas.DataFrame.aggregate

Similar DataFrame method.

pandas.Series.aggregate

Similar Series method.

Notes

agg is an alias for aggregate. Use the alias.

A passed user-defined-function will be passed a Series for evaluation.

Examples

>>> df = pd.DataFrame({"A": [1, 2, 3], "B": [4, 5, 6], "C": [7, 8, 9]})
>>> df
   A  B  C
0  1  4  7
1  2  5  8
2  3  6  9

>>> df.ewm(alpha=0.5).mean()
          A         B         C
0  1.000000  4.000000  7.000000
1  1.666667  4.666667  7.666667
2  2.428571  5.428571  8.428571

pandas.core.window.expanding.Expanding.apply pandas.core.window.expanding.Expanding.quantile