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scipy.sparse.lil_matrix.

# nonzero

lil_matrix.nonzero()

  Nonzero indices of the array/matrix.

  Returns:
    row ndarray

      Row indices of non-zero elements.

    col ndarray

      Column indices of non-zero elements.

  Examples

      >>> from scipy.sparse import csr_array
      >>> A = csr_array([[1, 2, 0], [0, 0, 3], [4, 0, 5]])
      >>> A.nonzero()
      (array([0, 0, 1, 2, 2], dtype=int32), array([0, 1, 2, 0, 2], dtype=int32))