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NumPy · Function

np.isin

Tests whether each value in an array occurs in another collection. It returns a Boolean mask with the same shape as element.

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Syntax

numpy.isin(element, test_elements, assume_unique=False, invert=False, *, kind=None)

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  • numpy.ma.isin
  • numpy.nonzero
  • numpy.in1d

Source: numpy.isin — NumPy v2.5 Manual. Checked 2026-11-03.