import concurrent.futures
import requests

def has_wikipedia_page(name):
    response = requests.get(
        'http://en.wikipedia.org/wiki/%s' % name.replace(' ', '_')
    )
    return response.status_code == 200
    

if __name__ == '__main__':
    
    people = (
        'Barack Obama', 'Shimon Peres', 'Justin Bieber',
        'Some guy I saw on the street', 'Steve Buscemi',
        'My first-grade teacher', 'Gandhi'
    )
    people_who_have_wikipedia_pages = (
        'Barack Obama', 'Shimon Peres', 'Justin Bieber', 'Steve Buscemi',
        'Gandhi'
    )
    with concurrent.futures.ThreadPoolExecutor(100) as executor:
    
        print('These people have a page on Wikipedia:')
        for person in (person for person, filter_result in
                       zip(people, executor.map(has_wikipedia_page, people))
                       if filter_result):
            
            print(person)