get url values and send them back to address in python

Question

I have a link which is generating an equation which must be answered. To do that I'm trying to read returned http to find those numbers

import urllib2, urllib
url = 'http://someurl.com'
answerRegexp = re.compile('''(\d+)\s([+-])\s(\d+)\s=\s<input name="answer"''')
response = urllib2.urlopen(url)
html = response.read()
res = answerRegexp.findall(html)[0]

values = {'field1': 'value1',
      'field2': 'value2',
      'answer': eval("%s%s%s" % (res[0], res[1], res[2])) # 2+3 for example
}

data = urllib.urlencode(values)
req = urllib2.Request(url, data)
response = urllib2.urlopen(req)
the_page = response.read()

This does not work since data is creating another request in which a new equation is being generated, thus the calculated value will not match the correct answer.

Josep Valls · Accepted Answer · 2016-01-01 18:42:08Z

1

The website you are working with may be using session cookies which you need to pass back and forth in order to identify the previous session (and therefore preventing a new challenge to be generated). Consider using the Requests library http://docs.python-requests.org/en/latest/ which will take care of all of those for you.

answered Jan 1, 2016 at 18:42

Josep Valls

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