https://qiita.com/dzbt_dzbt/items/e825af611986231211bc

progress.py

import time


def sec_to_time(sec):
    """引数secの秒数を'HH:MM:SS'形式文字列に変換して返す"""
    m, s = divmod(int(sec), 60)
    h, m = divmod(m, 60)
    return f'{h:02}h {m:02}m {s:02}s'


def progress(items):
    last = len(items)
    start = time.time()
    for count, item in enumerate(items, 1):
        yield item
        end = time.time()
        average = (end - start) / count
        remain = (last - count) * average
        print(f'\r{count}/{last}, 残り時間見込み：{sec_to_time(remain)}', end='')
    print()


def main():
    a = 0
    for num in progress(range(10000)):
        a += num
        time.sleep(0.1)
    print(a)

if __name__ == '__main__':
    main()