Python - Download Captcha Images

import requests
import os
from random import randint

for x in range(100, 1000):
    url = ""
    payload = {}
    headers= {}
    response = requests.request("GET", url, headers=headers, data = payload)
    #print(response.text.encode('utf8'))
   
    url = ""
    payload = {}
    response = requests.request("GET", url, cookies=response.cookies)
   
    f_ext = x
    f_name = 'D:/Temp/Captcha/{}.png'.format(f_ext)
    with open(f_name, 'wb') as f:
        f.write(response.content)
   
    print("Iteration : " + str(x) )

print( "Done !")