a.py

import requests
import qrtools
import re,os
from shell_command import shell_call
shell_call("rm -f *.png")

def decode_qr(r):                                                
    img="http://35.184.20.243:8002/qrweb/img/"+r
    os.system("curl "+img+" >> "+r)
    qr = qrtools.QR()
    qr.decode(r)
    return qr.data
def qr(im_reg):
    qrqr=''
    for im in im_reg:
        q=decode_qr(im)
        qrqr = qrqr + q
    return qrqr
 
 
url = 'http://35.184.20.243:8002/qrweb/index.php'
 
print "Sending answers... (this challenge takes some time...)"
s = requests.Session()
r=s.get(url)

while True:
    q = qr(re.findall(r"\d+.png",r.text))
    r=s.post('http://35.184.20.243:8002/qrweb/validate.php', data={"qr": q ,'submit':'Submit+query'})
    if 'CTF' in r.text : 
        print(r.text)
        break