python如何让程序暂停执行和继续执行？

import time

import cv2

import numpy as np

def pause_key(keypress, seconds):

    key = 0

    print('准备开始，按空格键暂停及继续。。。。。。\n')

    img = np.zeros((100, 200, 3), np.uint8)

    img.fill(255)

    cv2.putText(img, '!!!!!!', (10, 50),cv2.FONT_HERSHEY_COMPLEX, 2.0, (100, 200, 200), 5)

    cv2.imshow('attention!', img)

    for second in range(seconds):

        input_kb = cv2.waitKey(1) & 0xFF

        if input_kb == ord(' '):

            print('paused')

            cv2.waitKey(0)

            print('continued')

        time.sleep(1)

        print(second)

        second += 1

    cv2.destroyAllWindows()

if __name__ == '__main__':

    pause_key(keypress=' ', seconds=10)