My code keeps giving me unknown bugs that I can't fix

I'm trying to convert an image to grayscale after the user clicks on the original image but I can't get it to work. Here is the entire code I've written.

from PIL import Image
from pathlib import Path
import win32api

data_folder = Path("H:/Elijah Kroeber/Images")
file = data_folder / "nature.jpg"

try:
    img = Image.open(file)
except IOError:
    pass

with Image.open(file) as image:
    width, height = image.size

win = image.size


state_left = win32api.GetKeyState(0x01)
while True:
    a = win32api.GetKeyState(0x01)

if a != state_left:
    for row in range(img.getHeight()):
        for col in range(img.getWidth()):
            p = img.getPixel(col, row)

            aver = (p.getRed() + p.getGreen() + p.getBlue())/3

            newred = aver
            newgreen = aver
            newblue = aver

            newpixel = Image.Pixel(newred, newgreen, newblue)

            img.setPixel(col, row, newpixel)

img.draw(win)