PyAutoGUI Shift-Down does Nothing

Question

I have the following script that is intended to take a screenshot of a video every 5sec by taking a screenshot, then hitting shift-right to fast-foward to the next 5sec interval, repeat. It looks like the shiftdown is not working, as whenever i do it manually, it works but whenever I run the script, the right button works but no shift.

time.sleep(2)

while t < 20:
    time.sleep(0.5)
    pyautogui.keyDown('shiftleft')
    time.sleep(0.5)
    pyautogui.press('right')
    pyautogui.keyUp('shiftleft')
    time.sleep(2)
    screenshot = pyautogui.screenshot()
    screenshot.save(loc + str(t) + '.png')
    t = t + 1

time.sleep(0.5)

Answer 1

If you are using Windows AND if you are willing to try a different module, pydirectinput seems to work better than pyautogui for <shift>+<arrow> key operations. I got the idea from this answer

The example below uses an open copy of Notepad. In Notepad, <shift> + <arrow> will select text. For this example to work, you'll want a some spaces in your file and the cursor would have to be to the left of at least one space.

import pyautogui
import pydirectinput
import time

mywin = pyautogui.getWindowsWithTitle("Notepad")[0]

mywin.activate()
time.sleep(2)

pydirectinput.keyDown('shift')
pydirectinput.press('right')
pydirectinput.keyUp('shift')