fix python3.x _asdict() return None
fix python3.x _asdict() return None

Signed-off-by: mengskysama <34f785f4f31b4e465b52d81bdee6cd1257cbcdf2@gmail.com>

sdurrheimer/compose,sdurrheimer/compose,thaJeztah/compose,vdemeester/compose,shin-/compose,dnephin/compose,jrabbit/compose,thaJeztah/compose,shin-/compose,dnephin/compose,funkyfuture/docker-compose,hoogenm/compose,hoogenm/compose,funkyfuture/docker-compose,schmunk42/compose,jrabbit/compose,vdemeester/compose,schmunk42/compose