a simple and useful progress bar in python

progress.py

import sys
import time


def progress(iterable, length=33):
    count = avg = 0
    total = len(iterable)
    then = time.time()
    for it in iter(iterable):
        yield it
        count += 1
        avg += (time.time() - then - avg) / count
        then = time.time()
        percent = count / total
        filled_len = round(length * percent)
        bar = '█' * filled_len + ' ' * (length - filled_len)
        sys.stdout.write(f'▕{bar}▏ {round(100 * percent)}% {round((total - count) * avg)}s \r')
        sys.stdout.flush()
    sys.stdout.write(f'▕{"█" * length}▏ 100% {round(avg * total)}s \n')