gpgme python hang

========= SCRIPT ==========

import gpg

with gpg.Context() as local_ctx:
    def cb(keyword, args, fnc_value=None):
        print "callback invoked"
        print keyword
        print args
        print fnc_value

        if args == 'keyedit.prompt':
            # No matter what I return it has the same effect
            print "returning fpr\n"
            return "fpr"

        print "returning 0\n"
        return "0"

    sink = gpg.Data()

    master = local_ctx.get_key("foo@bar.com")
    local_ctx.interact(master, cb, sink)

    print "finished interacting"

========= OUTPUT ==========

➜  gpgme python test2.py
callback invoked
KEY_CONSIDERED
3BD88EE840CCF86795A20705E8D6CFA90EF585D0 0
None
returning 0

callback invoked
GET_LINE
keyedit.prompt
None
returning fpr

(Notice how we never reach the end to say "finished interacting")