def from_obj(package_obj):
if not package_obj:
return None
package_ = Package(None)
package_.id = package_obj.get_id()
package_.schema_version = package_obj.get_schema_version()
package_.timestamp = package_obj.get_timestamp()
if package_obj.get_Malware_Subjects() is not None : package_.malware_subjects = MalwareSubjectList.from_obj(package_obj.get_Malware_Subjects())
if package_obj.get_Grouping_Relationships() is not None : package_.grouping_relationships = GroupingRelationshipList.from_obj(package_obj.get_Grouping_Relationships())
return package_
