xkcd scraper - selenium

from selenium import webdriver
import urllib
import os
import shutil

driver = webdriver.Chrome("./chromedriver")
# if not os.path.exists("xkcd"):
#     os.mkdir("xkcd")
# else:
#     shutil.rmtree('xkcd')
#     os.mkdir("xkcd")


for num in range(1, 1647):
    driver.get("http://xkcd.com/" + str(num))
    data = driver.execute_script("""
        var comic = document.getElementById("comic");
        var title = document.getElementById("ctitle").textContent;
        var img = document.getElementById("comic");
        var alt = img.title;
        var src = img.src;
        if(!src) {
            for(var i = 0; i < comic.children.length; i++) {
                console.log("IMG");
                if(comic.children[i].tagName === "IMG") {
                    var src = comic.children[i].src;
                }
            }
            if(!src) {
                var src = comic.children[0].children[0].src;
            }
        }

        return [title, src, alt]
    """)
    title = data[0]
    title = title.replace("/", "_")

    src = data[1]
    alt = data[2]

    urllib.urlretrieve(src, "xkcd8/" + str(num) + "." + title + ".png")