Return a dictionary with a copy of each interface attributes in ATTRS

def _copy_interfaces_info(interfaces):
    '''
    Return a dictionary with a copy of each interface attributes in ATTRS
    '''
    ret = {}

    for interface in interfaces:
        _interface_attrs_cpy = set()
        for attr in ATTRS:
            if attr in interfaces[interface]:
                attr_dict = Hashabledict()
                attr_dict[attr] = repr(interfaces[interface][attr])
                _interface_attrs_cpy.add(attr_dict)
        ret[interface] = _interface_attrs_cpy

    return ret