import sqlite3 class IterChars:    def __init__(self):        self.count = ord('a')     def __iter__(self):        return self     def next(self):        if self.count > ord('z'):            raise StopIteration        self.count += 1        return (chr(self.count - 1),) # this is a 1-tuple con = sqlite3.connect(":memory:")cur = con.cursor()cur.execute("create table characters(c)") theIter = IterChars()cur.executemany("insert into characters(c) values (?)", theIter) cur.execute("select c from characters")print cur.fetchall()