attn.: psycopg users -- simple question

Sorry to burden this list (again) with a psycopg question.
I'm stuck at a table creation step and am not getting results
from their list.

Question: what's the appropriate syntax for specifying a primary
key?

My very simple table creation test (based on their "first.py"
example is failing ... Here's what I'm trying. Non-pythonated
syntax works in pgsql:

no go in psycopg:
curs.execute("""CREATE TABLE key_test (
key_col CHAR(9) PRIMARY KEY,
nother_col CHAR(256))""")

pure joy in pgsql:
cs_test=# CREATE TABLE key_test (
cs_test(# key_col CHAR(9) PRIMARY KEY,
cs_test(# nother_col CHAR(256)
cs_test(# );

Thanks again!
Scott