ref: a944c37d68b3742ae5156cec3bd23f64ad5c7a1b
dir: /sys/src/cmd/python/Doc/lib/sqlite3/executemany_2.py/
import sqlite3
def char_generator():
    import string
    for c in string.letters[:26]:
        yield (c,)
con = sqlite3.connect(":memory:")
cur = con.cursor()
cur.execute("create table characters(c)")
cur.executemany("insert into characters(c) values (?)", char_generator())
cur.execute("select c from characters")
print cur.fetchall()