4-solveCaptcha.py

from urllib.request import urlretrieve
from urllib.request import urlopen
from bs4 import BeautifulSoup
import subprocess
import requests
from PIL import Image
from PIL import ImageOps

def cleanImage(imagePath):
    image = Image.open(imagePath)
    image = image.point(lambda x: 0 if x<143 else 255)
    borderImage = ImageOps.expand(image,border=20,fill='white')
    borderImage.save(imagePath)

html = urlopen("http://www.pythonscraping.com/humans-only")
bsObj = BeautifulSoup(html)
#Gather prepopulated form values
imageLocation = bsObj.find("img", {"title": "Image CAPTCHA"})["src"]
formBuildId = bsObj.find("input", {"name":"form_build_id"})["value"]
captchaSid = bsObj.find("input", {"name":"captcha_sid"})["value"]
captchaToken = bsObj.find("input", {"name":"captcha_token"})["value"]

captchaUrl = "http://pythonscraping.com"+imageLocation
urlretrieve(captchaUrl, "captcha.jpg")
cleanImage("captcha.jpg")
p = subprocess.Popen(["tesseract", "captcha.jpg", "captcha"], stdout=
    subprocess.PIPE,stderr=subprocess.PIPE)
p.wait()
f = open("captcha.txt", "r")

#Clean any whitespace characters
captchaResponse = f.read().replace(" ", "").replace("\n", "")
print("Captcha solution attempt: "+captchaResponse)

if len(captchaResponse) == 5:
    params = {"captcha_token":captchaToken, "captcha_sid":captchaSid,   
              "form_id":"comment_node_page_form", "form_build_id": formBuildId, 
                  "captcha_response":captchaResponse, "name":"Ryan Mitchell", 
                  "subject": "I come to seek the Grail", 
                  "comment_body[und][0][value]": 
                                           "...and I am definitely not a bot"}
    r = requests.post("http://www.pythonscraping.com/comment/reply/10", 
                          data=params)
    responseObj = BeautifulSoup(r.text)
    if responseObj.find("div", {"class":"messages"}) is not None:
        print(responseObj.find("div", {"class":"messages"}).get_text())
else:
    print("There was a problem reading the CAPTCHA correctly!")