sqlite3 и данные из текстовых файлов

import sqlite3
 
base = sqlite3.connect('new.db')
cur = base.cursor()
print("База данных создана и успешно подключена")
 
base.execute('CREATE TABLE IF NOT EXISTS package(Package, Maintainer, Description1)')
base.commit()
 
pac = []
w = ('Package: ')
with open('install_contrib.txt', 'r') as fin, open('install_main.txt', 'r') as fin2, open('install_non-free.txt', 'r') as fin3:
    for sw1, sw2, ws3 in zip(fin, fin2, fin3):
        if sw1.find(w) > -1:
            pac.append([str(x) for x in sw1.split()])
    for sw2 in fin2.readlines():
        if sw2.find(w) > -1:
            pac.append([str(x) for x in sw2.split()])
    for sw3 in fin3.readlines():
        if sw3.find(w) > -1:
            pac.append([str(x) for x in sw3.split()])
main = []
q = ('Package: ')
with open('install_contrib.txt', 'r') as fin, open('install_main.txt', 'r') as fin2, open('install_non-free.txt', 'r') as fin3:
    for sq1, sq2, sq3 in zip(fin, fin2, fin3):
        if sq1.find(q) > -1:
            main.append([str(x) for x in sq1.split()])
    for sq2 in fin2.readlines():
        if sq2.find(q) > -1:
            main.append([str(x) for x in sq2.split()])
    for sq3 in fin3.readlines():
        if sq3.find(q) > -1:
            main.append([str(x) for x in sq3.split()])
desc = []
a = ('Description: ')
with open('install_contrib.txt', 'r') as fin, open('install_main.txt', 'r') as fin2, open('install_non-free.txt', 'r') as fin3:
    for sa1, sa2, sa3 in zip(fin, fin2, fin3):
        if sa1.find(a) > -1:
            desc.append([str(x) for x in sa1.split()])
    for sa2 in fin2.readlines():
        if sa2.find(a) > -1:
            desc.append([str(x) for x in sa2.split()])
    for sa3 in fin3.readlines():
        if sa3.find(a) > -1:
            desc.append([str(x) for x in sa3.split()])
#ошибка возникает тут
cur.executemany("INSERT INTO package VALUES(?,?,?);", (pac, main, desc))
cur.commit()
 
base.close()
print("Соединение с базой данных закрыто")