@classmethod
def get(cls, session, parent=None):
    """Gets all of the power supplies from the APIC.
        If parent is specified, it will only get power supplies that are
        children of the the parent.  The power supplies
        will also be added as children to the parent Node.

        The Powersupply object is derived mostly from the APIC 'eqptPsu' class.

        :param session: APIC session
        :param parent: optional parent switch of class Node

        :returns: list of powersupplies
        """
    return cls.get_obj(session, cls._get_apic_classes(), parent)
