code: def vector_sum(vector1, vector2, coeff=1.0):
      
      summed_vector = [v1 + (coeff * v2) for v1, v2 in zip(vector1, vector2)]
      return summed_vector
docs: Sums the vectors.
  
      This function computes the result of the vector operation :math:`\\overline{v}_{1} + c * \\overline{v}_{2}`, where
      :math:`\\overline{v}_{1}` is ``vector1``, :math:`\\overline{v}_{2}`  is ``vector2`` and :math:`c` is ``coeff``.
  
      :param vector1: vector 1
      :type vector1: list, tuple
      :param vector2: vector 2
      :type vector2: list, tuple
      :param coeff: multiplier for vector 2
      :type coeff: float
      :return: updated vector
      :rtype: list