Chris Rebert wrote: > On Tue, Nov 11, 2008 at 12:56 AM, Gilles Ganault <[EMAIL PROTECTED]> wrote: >> On Mon, 10 Nov 2008 20:02:39 -0600, Andrew <[EMAIL PROTECTED]> wrote: >>> sql = 'SELECT id FROM master' >>> rows=list(cursor.execute(sql)) >>> for id in rows: >>> sql = 'SELECT COUNT(code) FROM companies WHERE code="%s"' % id[0] >>> result = list(cursor.execute(sql)) >>> print "Code=%s, number=%s" % (id[0],result[0][0]) > > Using liberal "term rewriting", consider the following rough > equivalencies in the code: > > id[0] <==> rows[INDEX_HERE][0] <==> list(cursor.execute(sql))[INDEX_HERE][0] > result[0][0] <==> list(cursor.execute(sql))[0][0] > > Note that in both cases, the list is sliced twice; the for-loop just > conceals the `[INDEX_HERE]` implicit slicing that is caused by > iterating over the list.
You might also want to consider saving some time by using a SQL solution (assuming SQLite supports it, which it should) (untested): cursor.execute(""" SELECT master.id, count(companies.code) FROM master JOIN companies ON master.id = companies.code GROUP BY companies.code""") for id, count in cursor.fetchall(): print "Code=%s, number=%s" % (id, count) I'd like to think it makes the Python a bit more readable too ... regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 Holden Web LLC http://www.holdenweb.com/ -- http://mail.python.org/mailman/listinfo/python-list