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    <p>I would definitely suggest trying to use the API if possible, but this works for me (not for your example post, which has been deleted, but for any active one):</p> <pre><code>#!/usr/bin/env python import mechanize import cookielib import urllib import logging import sys def main(): br = mechanize.Browser() cj = cookielib.LWPCookieJar() br.set_cookiejar(cj) br.set_handle_equiv(True) br.set_handle_gzip(True) br.set_handle_redirect(True) br.set_handle_referer(True) br.set_handle_robots(False) br.set_handle_refresh(mechanize._http.HTTPRefreshProcessor(), max_time=1) r= br.open('http://www.reddit.com') # Select the second (index one) form br.select_form(nr=1) # User credentials br.form['user'] = 'user' br.form['passwd'] = 'passwd' # Login br.submit() # Open up comment page posting = 'http://www.reddit.com/r/PoopSandwiches/comments/f47f8/testing/' rval = 'PoopSandwiches' # you can get the rval in other ways, but this will work for testing r = br.open(posting) # You need the 'uh' value from the first form br.select_form(nr=0) uh = br.form['uh'] br.select_form(nr=7) thing_id = br.form['thing_id'] id = '#' + br.form.attrs['id'] # The id that gets posted is the form id with a '#' prepended. data = {'uh':uh, 'thing_id':thing_id, 'id':id, 'renderstyle':'html', 'r':rval, 'text':"Your text here!"} new_data_dict = dict((k, urllib.quote(v).replace('%20', '+')) for k, v in data.iteritems()) # not sure if the replace needs to happen, I did it anyway new_data = 'thing_id=%(thing_id)s&amp;text=%(text)s&amp;id=%(id)s&amp;r=%(r)s&amp;uh=%(uh)s&amp;renderstyle=%(renderstyle)s' %(new_data_dict) # not sure which of these headers are really needed, but it works with all # of them, so why not just include them. req = mechanize.Request('http://www.reddit.com/api/comment', new_data) req.add_header('Referer', posting) req.add_header('Accept', ' application/json, text/javascript, */*') req.add_header('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8') req.add_header('X-Requested-With', 'XMLHttpRequest') cj.add_cookie_header(req) res = mechanize.urlopen(req) main() </code></pre> <p>It would be interesting to turn javascript off and see how the reddit comments are handled then. Right now there is a bunch of <code>magic</code> that happens in an onsubmit function called when making your post. This is where the <code>uh</code> and <code>id</code> value get added.</p>
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    1. COWow. Thank you so much. I would have never figured that out.
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    2. COHmm... I'm getting this error on all active threads: ControlNotFoundError: no control matching name 'thing_id.' Any ideas?
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    3. COHaha, no. You misinterpreted that sentence-- no matter which active thread I use this program on, it still triggers the error. The program I'm trying to make is for my own purposes. It posts relevant book chapters to a private subreddit I moderate.
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