Construct a `PhononWork` from a :class:`ScfTask` object.
        The input file for phonons is automatically generated from the input of the ScfTask.
        Each phonon task depends on the WFK file produced by the `scf_task`.

        Args:
            scf_task: ScfTask object.
            qpoints: q-points in reduced coordinates. Accepts single q-point, list of q-points
                or three integers defining the q-mesh if `is_ngqpt`.
            is_ngqpt: True if `qpoints` should be interpreted as divisions instead of q-points.
            tolerance: dict {"varname": value} with the tolerance to be used in the phonon run.
                None to use AbiPy default.
            with_becs: Activate calculation of Electric field and Born effective charges.
            ddk_tolerance: dict {"varname": value} with the tolerance used in the DDK run if with_becs.
                None to use AbiPy default.
            manager: :class:`TaskManager` object.

def from_scf_task(cls, scf_task, qpoints, is_ngqpt=False, tolerance=None, with_becs=False,
                      ddk_tolerance=None, manager=None):
        """
        Construct a `PhononWork` from a :class:`ScfTask` object.
        The input file for phonons is automatically generated from the input of the ScfTask.
        Each phonon task depends on the WFK file produced by the `scf_task`.

        Args:
            scf_task: ScfTask object.
            qpoints: q-points in reduced coordinates. Accepts single q-point, list of q-points
                or three integers defining the q-mesh if `is_ngqpt`.
            is_ngqpt: True if `qpoints` should be interpreted as divisions instead of q-points.
            tolerance: dict {"varname": value} with the tolerance to be used in the phonon run.
                None to use AbiPy default.
            with_becs: Activate calculation of Electric field and Born effective charges.
            ddk_tolerance: dict {"varname": value} with the tolerance used in the DDK run if with_becs.
                None to use AbiPy default.
            manager: :class:`TaskManager` object.
        """
        if not isinstance(scf_task, ScfTask):
            raise TypeError("task `%s` does not inherit from ScfTask" % scf_task)

        if is_ngqpt:
            qpoints = scf_task.input.abiget_ibz(ngkpt=qpoints, shiftk=[0, 0, 0], kptopt=1).points
        qpoints = np.reshape(qpoints, (-1, 3))

        new = cls(manager=manager)
        if with_becs:
            new.add_becs_from_scf_task(scf_task, ddk_tolerance, ph_tolerance=tolerance)

        for qpt in qpoints:
            if with_becs and np.sum(qpt ** 2) < 1e-12: continue
            multi = scf_task.input.make_ph_inputs_qpoint(qpt, tolerance=tolerance)
            for ph_inp in multi:
                new.register_phonon_task(ph_inp, deps={scf_task: "WFK"})

        return new