def _get_of_op(operator_tuple):
    ' Returns operator given by a operator tuple as OpenFermion - Fermion operator '
    op = openfermion.FermionOperator(operator_tuple)
    return op
Returns operator given by a operator tuple as OpenFermion - Fermion operator
def _get_of_op(operator_tuple):
    '  '
    op = openfermion.FermionOperator(operator_tuple)
    return op