Comparing results of Gevent threads

Question

I am running a flask app asynchronously with gevent. My main app has:

def multiple():
    ..........
    threads = [gevent.spawn(fetch, data for i in range(2)]
    result = gevent.joinall(threads)
    print [thread.value for thread in threads]

return "DICTIONARY GOES HERE"

This runs with slightly different data which yields (from the fetch function):

 {u': False, 'delete_at': 1438759341.674, 'id': 43, 'fa': 5.4, 'created_at': 1438701741.674 }
 {u': True, 'delete_at': 1438759341.675, 'id': 44, 'fa': 9.3, 'created_at': 1438701741.675 }
 {u': False, 'delete_at': 1438759341.675, 'id': 47, 'fa': 4.7, 'created_at': 1438701741.675 }

I want to return only a dictionary with u =True, or the first one that's true if there is more than one. How can I do this?

Answer 1

I would simply write something like this:

...
result = gevent.joinall(threads)
for x in (t.value for t in threads):
    if x.u:
        return x

or:

...
result = gevent.joinall(threads)
return (t.value for t in threads if t.u).next()