I had to do something similar and I used something like this:
from django.contrib.admin.models import LogEntry
logs = LogEntry.objects.all() #or you can filter, etc.
for l in logs:
#perform action
You can see all of the attributes for LogEntry, but I think the ones you are looking for are l.user, l.action_time and l.obj_repr (the name of the obj) and l.action_flag ({ 1:'Add',2:'Change',3:'Delete'}). Hope that helps!