Copy from and serial columns - Mailing list pgsql-novice

I have a client (psycopg2) that only allows copies of the entire table
(not specific rows).  I would like to use a SERIAL column on tables, but
I cannot seem to figure out how to apply the default.  Trying to insert
a NULL does not do it.  Is there another way, or should I do what is
probably better and ask the client author to provide functionality for
allowing subsets of columns to be passed to the copy command?

Thanks,
Sean