I wrote this little script to use push notifications using Pythonista :)

import requests

#You need a pushbullet.com account + the pushbullet app.
#Download the app and create your account from there.
#Now get a token at https://www.pushbullet.com/account and insert it down below.

token = 'TOKEN'     #account token
url = 'https://api.pushbullet.com/v2/pushes'    #the url for pushes

def push(title,msg='',link=''):                 #function to send a push notification
    dict = {'type':'note',
            'title':title,
            'body':msg,
            'url':link}
    if link != '':
        dict['type'] = 'link'
    r = requests.request('POST', url, auth=(token,''), data=dict)   #perform request with token and data

This might be useful, if you want to send a message from one device to another. I am currently trying to add to specify a registered device to which the message should be send to.
One downside is that if you send a link and tap on the notification, you will be send to the pushbullet app and have to click on a button there, to go to the link destination.