DataFrame.sum(axis=0, numeric_only=None, skipna=True, level=None)

Return sum over requested axis. NA/null values are excluded

Parameters :

axis : {0, 1}

0 for row-wise, 1 for column-wise

skipna : boolean, default True

Exclude NA/null values. If an entire row/column is NA, the result will be NA

level : int, default None

If the axis is a MultiIndex (hierarchical), count along a particular level, collapsing into a DataFrame

numeric_only : boolean, default None

Include only float, int, boolean data. If None, will attempt to use everything, then use only numeric data

Returns :

sum : Series (or DataFrame if level specified)