How do you get pyapns (python push notification) working on a mac?

openssl rsa -in apns-dev-key.pem -out apns-dev-key-noenc.pem

def send_notifications(self, tokens, payload):
    for token in tokens:
        try :
            logging.info("Sending Notification to Token: %s" % (token))
            self.send_notification(token, payload, identifier=None, expiry = (datetime.utcnow() + timedelta(300)))                
        except Exception, e:
            self._disconnect()
            logging.info("Exception: %s" % (str(e)))
            logging.info("Token: %s" % (token))

import time
from apns import APNs, Frame, Payload

apns = APNs(use_sandbox=True, cert_file='cert.pem', key_file='key.pem')

# Send a notification
token_hex = 'b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b87'
payload = Payload(alert="Hello World!", sound="default", badge=1)
apns.gateway_server.send_notification(token_hex, payload)

# Send multiple notifications in a single transmission
frame = Frame()
identifier = 1
expiry = time.time()+3600
priority = 10
frame.add_item('b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b87', payload, identifier, expiry, priority)
apns.gateway_server.send_notification_multiple(frame)