cumsum(self, axis: 'int' = 0, *args, **kwargs) -> 'SparseArray'
When performing the cumulative summation, any non-NA/null values will be skipped. The resulting SparseArray will preserve the locations of NaN values, but the fill value will be :None:None:`np.nan` regardless.
Axis over which to perform the cumulative summation. If None, perform cumulative summation over flattened array.
Cumulative sum of non-NA/null values.
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