class_docstr: Flat iterator object that uses its own setter/getter
  (works around ndarray.flat not propagating subclass setters/getters
  see https://github.com/numpy/numpy/issues/4564)
  roughly following MaskedIterator
class_docstr_tok: ["Flat","iterator","object","that","uses","its","own","setter\/getter","(","works","around","ndarray.flat","not","propagating","subclass","setters\/getters","see","https",":","\/\/github.com\/numpy\/numpy\/issues\/4564",")","roughly","following","MaskedIterator"]
code: def __setitem__(self, index, value):
      self._dataiter[index] = self._original._validate_input(value)
  
imports: import numpy
  from numpy.lib.mixins import NDArrayOperatorsMixin
  from numpy.testing import assert_, assert_raises
  from numpy.ma.testutils import assert_equal
  from numpy.ma.core import array, arange, masked, MaskedArray, masked_array, log, add, hypot, divide, asarray, asanyarray, nomask
label_desc: Use image node_id 4 for calling the CSAIterator obj's underlying member method code with example usage: obj.__setitem__(index, value) without return types