reading CAPTCHA using tesseract giving always wrong readings

from urllib import urlopen,urlretrieve
from PIL import Image,ImageOps
from bs4 import BeautifulSoup
import requests
import subprocess
def cleanImage(imagePath):
    image=Image.open(imagePath)
    image=image.point(lambda x:0 if x<143 else 255)
    borederImage=ImageOps.expand(image,border=20,fill="white")
    borederImage.save(imagePath)
html=urlopen("http://www.pythonscraping.com/humans-only")
soup=BeautifulSoup(html,'html.parser')
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')
captchaResponce=f.read().replace(" ","").replace("\n","")
print "captcha responce attempt "+ captchaResponce+"\n\n"
try:
    print captchaResponce
    print len(captchaResponce)
    print type(captchaResponce)
except:
    print "No way"

Hello

This is my code for a testing site to download the CAPTCHA image(each time you open site you'll get a different CAPTCHA),then read it using tesseract in python.

I have tried to download the image directly and read it directly using tesseract it didn't get the correct CAPTCHA reading,so i added the function cleanImage to help but also it didn't read it correctly.

After searching online, my problem seems to be with tesseract not being "trained" to process the images correctly.

Any help is much appreciated

from reading CAPTCHA using tesseract giving always wrong readings