按“空格键”可停止暂停循环，再按一次可恢复循环（请参阅“更新”）

Question

from PIL import Image
import time
import subprocess
for i in bio:
    p = subprocess.Popen(["C:\Program Files\IrfanView\i_view64.exe",'C:\\Users\Moondra\\Bioteck_charts\{}.png'.format(i)])
    time.sleep(5)
    p.kill()

This is my current code. I'm on Windows 7. I'm iterating through a list, and for each element, I'm opening a picture and then closing it after 5 seconds. However, I would like to be able to pause this loop if I would like to study the image longer and then be able to resume the loop from where I left off.

Psudo-code is something like this:

from PIL import Image
import time
import subprocess
for i in bio:

    p = subprocess.Popen(["C:\Program Files\IrfanView\i_view64.exe",'C:\\Users\Moondra\\Bioteck_charts\{}.png'.format(i)])
    time.sleep(5)
    if Keypress == 'Spacebar': 
        pause
        if Keypress =="Spacebar": resume


    p.kill()

I saw these two threads but one is over 9 years old (on user input) and both seem complicated using threading (which I'm not really familiar with).

User input :

How to get user input during a while loop without blocking

Pausing the loop:

Python - using [spacebar] to pause for loop

Is there a clean way to do what I would like?

EDIT:

Tests using msvcrt

from msvcrt import getch
while True:
    key = ord(getch())
    print(key)
    if key == 27: #ESC
        break

Just seems to output 255 (over and over). If I press esc , no reaction and loop doesn't break. The printed number (255) doesn't change as well despite pressing different keys.

UPDATE :

I'm attempting it a different way. Not sure if this is better but, I found a module called keyboard that is aware of keypresses input (and after playing around with it, it seems to work fine). I'm attempting to use threading to do so, but it seems I'm not getting the timing with threading right. I think the problem is when my time.sleep() is called in my thread, my keypresses aren't read.

from threading import Thread import keyboard import subprocess import pickle

def keyboard_press():
    while p == True:
        if keyboard.is_pressed('down') == True:
            print('yes')
            input()
            p.kill()
        #continue


with open('C:\\Users\Moondra\\Bioteck.pickle', 'rb') as file:
    bio = pickle.load(file)



for i in bio[:5]:

    p = subprocess.Popen(["C:\Program Files\IrfanView\i_view64.exe",'C:\\Users\Moondra\\Bioteck_charts\{}.png'.format(i)])
    from threading import Thread
    t = Thread(target = keyboard_press, args =())
    t.start()
    t.join()
    time.sleep(3)
    p.kill()

Answer 1

您想检测一个按键不是输入（），看看这个以供参考