numpy.ma.MaskedArray.tolist#

method

ma.MaskedArray.tolist(fill_value=None)[source]#

Return the data portion of the masked array as a hierarchical Python list.

Data items are converted to the nearest compatible Python type.Masked values are converted tofill_value. Iffill_value is None,the corresponding entries in the output list will beNone.

Parameters:
fill_valuescalar, optional

The value to use for invalid entries. Default is None.

Returns:
resultlist

The Python list representation of the masked array.

Examples

>>>importnumpyasnp>>>x=np.ma.array([[1,2,3],[4,5,6],[7,8,9]],mask=[0]+[1,0]*4)>>>x.tolist()[[1, None, 3], [None, 5, None], [7, None, 9]]>>>x.tolist(-999)[[1, -999, 3], [-999, 5, -999], [7, -999, 9]]