ca.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')
soup = BeautifulSoup(html, 'lxml')
imageLocation = soup.find('img', {"title": "Image CAPTCHA"})['src']
formBuildId = soup.find('input', {"name": "form_build_id"})['value']
captchaSid = soup.find('input', {"name": "captcha_sid"})['value']
captchaToken = soup.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', encoding='utf-8')
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": "hhhh",
        "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, 'lxml')
    if responseObj.find('div', {"class": "message"}) is not None:
        print(responseObj.find('div', {"class": "message"}).get_text())
else:
    print("There was a problem reading the CAPTCHA correctly!")