numpy.nditer.operands
attribute
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nditer.operands
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operands[ Slice]The array(s) to be iterated over. Valid only before the iterator is closed. 
    © 2005–2019 NumPy Developers
Licensed under the 3-clause BSD License.
    https://docs.scipy.org/doc/numpy-1.16.1/reference/generated/numpy.nditer.operands.html