make screen shot of specific part of screen python

import pyscreenshot as ImageGrab
# fullscreen
im=ImageGrab.grab()
im.show()

# part of the screen
im=ImageGrab.grab(bbox=(10,10,500,500))
im.show()

# to file
ImageGrab.grab_to_file('im.png')

import mss
import mss.tools


with mss.mss() as sct:
    # The screen part to capture
    monitor = {"top": 160, "left": 160, "width": 160, "height": 135}
    output = "sct-{top}x{left}_{width}x{height}.png".format(**monitor)

    # Grab the data
    sct_img = sct.grab(monitor)

    # Save to the picture file
    mss.tools.to_png(sct_img.rgb, sct_img.size, output=output)
    print(output)