StackOverflow to Github user mapping

stackoverflow_to_github_user.py

#!/usr/bin/python

__author__ = 'Khaled Monsoor <k@kmonsoor.com>'
__license__ = 'The MIT License: <http://kmonsoor.mit-license.org/>'

import json
import requests

def stackoverflow_to_github_user(stackoverflow_id):
    '''
    Given a numerical `userID` on StackOverflow, it returns user's username on Github, if available.
    If `userID` is invalid on StackOverflow, it raise `ValueError`.
    If `userID` is valid on StackOverflow but has no Github info associated, \
        it will return empty string('').
    '''
    url = 'http://stackoverflow.com/users/' + str(int(stackoverflow_id))
    response = requests.get(url)
    
    if response.status_code != 200:
        raise ValueError('Invalid user ID: {}'.format(stackoverflow_id))
        
    soup = BeautifulSoup(response.content)
    github_username = ''
    for tag in soup.find_all('a', attrs={'class': 'url'}):
        if 'github' in tag.get('href', ''):
            github_username = tag['href'].split('/')[-1]
    return github_username