<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def cumsum(self, axis=0, *args, **kwargs):
 """ Return SparseDataFrame of cumulative sums over requested axis. Parameters axis : {0, 1} 0 for row-wise, 1 for column-wise Returns ------- y : SparseDataFrame """

        nv.validate_cumsum(args, kwargs)

        if axis is None:
            axis = self._stat_axis_number

        return self.apply(lambda x: x.cumsum(), axis=axis)