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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _check_bond_interface_change(self, phy_interface, attr_obj):
 """Check if there's any change in bond interface. First check if the interface passed itself is a bond-interface and then retrieve the member list and compare. Next, check if the interface passed is a part of the bond interface and then retrieve the member list and compare. """

        bond_phy = sys_utils.get_bond_intf(phy_interface)
        if sys_utils.is_intf_bond(phy_interface):
            bond_intf = phy_interface
        else:
            bond_intf = bond_phy
        # This can be an addition or removal of the interface to a bond.
        bond_intf_change = attr_obj.cmp_update_bond_intf(bond_intf)
        return bond_intf_change