When you tell all people about each concept, I guess what you mean all the resources of rdf:type an specific class. With help, rdflibyou can easily do this by going through a graph:
from rdflib import Graph
from rdflib import URIRef
g = Graph()
g.parse("ontology.owl")
aClass = URIRef("http://www.someuri.org/for/your/class")
rdftype = URIRef("http://www.w3.org/1999/02/22-rdf-syntax-ns#type")
for triple in g.triples((None,rdfType,aClass)):
print triple
(None,rdfType,aClass) g.
, ,
. rdftype
aClass.
, :
for triple in g.triples((None,rdfType,None)):
print triple
unbound OWL.