linux在进度条无法启动

sudo apt update && sudo apt upgrade

sudo apt install libncurses5-dev libncursesw5-dev

import time
import sys

def progress_bar(iteration, total, prefix='', suffix='', decimals=1, length=50, fill='█'):
    percent = ("{0:." + str(decimals) + "f}").format(100 * (iteration / float(total)))
    filled_length = int(length * iteration // total)
    bar = fill * filled_length + '-' * (length - filled_length)
    sys.stdout.write('\r%s |%s| %s%% %s' % (prefix, bar, percent, suffix))
    sys.stdout.flush()
    if iteration == total:
        sys.stdout.write('\n')

items = list(range(0, 50))
l = len(items)

for i, item in enumerate(items):
    time.sleep(0.1)
    progress_bar(i + 1, l, prefix='Progress:', suffix='Complete', length=50)