some shit

import time
from array import array
import os

my_list = array('i', [i for i in range(10000)])

start = time.time()

for i in range(10_000_000):
    my_list.append(i)

fp = open('test.bin', 'wb')
my_list.tofile(fp)
fp.close()

print('time for appends 10 millions items:', time.time() - start, 'seconds')
print('size', os.path.getsize('test.bin')/1024/1024, 'Mbytes')