Series.sum()
pandas.Series.sum
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Series.sum(axis=None, skipna=None, level=None, numeric_only=None, **kwargs)[source] -
Return the sum of the values for the requested axis
Parameters: axis : {index (0)}
skipna : boolean, default True
Exclude NA/null values. If an entire row/column is NA, the result will be NA
level : int or level name, default None
If the axis is a MultiIndex (hierarchical), count along a par