A script that turns a short-lived access token into a one that never expires.

main.py

# -*- coding: utf-8 -*-
import requests
import json

def main():
    app_id = raw_input('App id: ')
    app_secret = raw_input('App secret: ')
    short_lived_access_token = raw_input('Short lived access token (obtained by using Graph API): ')

    long_lived_access_token = extend_short_lived_access_token(app_id, app_secret, short_lived_access_token)
    user_id = find_user_id(long_lived_access_token)

    never_expiring_access_token_data = get_never_expiring_access_token_data(user_id, long_lived_access_token)
    print get_pages(never_expiring_access_token_data)
    user_page_name = raw_input("What page do you want the access token to be from? Above are the options. ")
    never_expiring_access_token = find_page_access_token(never_expiring_access_token_data, user_page_name)
    print "Congratulations! Here is your never-expiring access token for the page '%s': %s" % (user_page_name, never_expiring_access_token)

def extend_short_lived_access_token(app_id, app_secret, access_token):
    extend_url = "https://graph.facebook.com/v2.7/oauth/access_token?grant_type=fb_exchange_token&client_id=%s&client_secret=%s&fb_exchange_token=%s" % (app_id, app_secret, access_token)
    extended_json = retrieve_json(extend_url)
    return extended_json['access_token']

def find_user_id(access_token):
    user_information_url = "https://graph.facebook.com/v2.7/me?access_token=%s" % access_token
    user_information_json = retrieve_json(user_information_url)
    return user_information_json['id']

def get_pages(access_token_data):
    page_names = ""
    for page in access_token_data:
        page_name = page['name']
        page_names += "%s || " % page_name
    return page_names.encode("utf-8")

def get_never_expiring_access_token_data(user_id, access_token):
    never_expiring_access_token_url = "https://graph.facebook.com/v2.7/%s/accounts?access_token=%s" % (user_id, access_token)
    never_expiring_access_token_json = retrieve_json(never_expiring_access_token_url)
    return never_expiring_access_token_json['data']

def find_page_access_token(access_token_data, page_name):
    for page in access_token_data:
        if page['name'] == page_name:
            return page['access_token']

def retrieve_json(url):
    request = requests.get(url)
    request_content = request.text
    request_json = json.loads(request_content)
    return request_json

if __name__ == '__main__':
    main()