Add support for "serialization" of deps to native Python objects about python-deb-pkg-tools HOT 1 OPEN

def deps_as_mapping(rel):
    """
    Return a native Python collection from a `rel` deb_pkg_tools.deps.Relationship
    object where every object is converted recursively  to basic collections types e.g. 
    an OrderedDict or a list. Other types are left untouched.
    """
    if isinstance(rel, (deps.RelationshipSet, deps.AlternativeRelationship,)):
        return map(deps_as_mapping, rel.relationships)

    if isinstance(rel, deps.VersionedRelationship):
        return OrderedDict([
            ('name', rel.name),
            ('version', rel.version),
            ('operator', rel.operator),
        ])

    # comes last as this is the least specialized type and the root of the
    # inheritance hierarchy and they have no version and operator
    # attribute therefore we return None for these for consistency.
    if isinstance(rel, deps.Relationship):
        return OrderedDict([
            ('name', rel.name),
            ('version', None),
            ('operator', None),
        ])
    return rel