import requests
import os

def download_file(url):
    local_filename = url.split('/')[-1]
    with requests.get(url, stream=True) as r:
        r.raise_for_status()
        with open(local_filename, 'wb') as f:
            for chunk in r.iter_content(chunk_size=8192):
                # If you have chunk encoded response uncomment if
                # and set chunk_size parameter to None.
                #if chunk:
                f.write(chunk)
    return local_filename

def init():
    if not os.path.exists('small-image.png'):
        download_file('https://files.ivanch.me/api/public/dl/ch3NV0P8/small-image.png')
    if not os.path.exists('big-image.png'):
        download_file('https://files.ivanch.me/api/public/dl/jNlXYMLR/big-image.png')

init()