Snippet for making a screenshot of a webpage in a browser.

webpage_screenshot.py

import re
from selenium import webdriver  # pip install selenium
from PIL import Image           # pip install Pillow

driver = webdriver.PhantomJS()  # assuming PhantomJS
width, height = 1024, 768
driver.set_window_size(width, height)
driver.get("http://docs.python-requests.org")
fn = "screenshot.png"
driver.save_screenshot(fn)
img = Image.open(fn).crop((0, 0, width, height))
img.save(re.sub(".png$", "-cropped.png", fn))