```#QR Code Decoder by sqrtrevimport qrtoolsimport urllib, httplib
r1 = ''while '{' not in r1:	urllib.urlretrieve('http://cbmctf2019.cf:3004/img/qr.png','./qr.png')	qr = qrtools.QR(filename="./qr.png")	qr.decode()	conn = httplib.HTTPConnection('cbmctf2019.cf',3004)	conn.request('GET','/check?string='+qr.data)	r1 = conn.getresponse().read()	print r1, qr.data```