Beginning Python - From Novice to Professional

CHAPTER 26 ■ PROJECT 7: YOUR OWN BULLETIN BOARD 491
curs = conn.cursor()
print """
The FooBar Bulletin Board
The FooBar Bulletin Board
"""
curs.execute('SELECT * FROM messages')
rows = curs.dictfetchall()
toplevel = []
children = {}
for row in rows:
parent_id = row['reply_to']
if parent_id is None:
toplevel.append(row)
else:
children.setdefault(parent_id,[]).append(row)
def format(row):
print '%(subject)s' % row
try: kids = children[row['id']]
except KeyError: pass
else:
print ''
for kid in kids:
format(kid)
print ''
print ''
for row in toplevel:
format(row)
print """
Post message
"""