This is a Google Cloud Messaging demo server written in Python it needs a Web.py http://webpy.org/ and GCM https://github.com/geeknam/python-gcm libs to work

main.py

# Google Cloud Messaging demo server in python
import web  # web.py lib
from gcm import GCM  # https://github.com/geeknam/python-gcm

urls = (
    '/gcm-demo', 'index',
    '/gcm-demo/register', 'register',
    '/gcm-demo/unregister', 'unregister'
)

reg_devs = [] #list of registered devices
gcm = GCM("ReplaceMe") #your google api key

class index:
    def GET(self):
        if len(reg_devs)== 0:
            return "no devices registered"
        data = {} # android gcm-demo-app doesn't need any data
        gcm.json_request(registration_ids=reg_devs, data=data)
        return "message sent to " + str(len(reg_devs)) + " devices"

class register:
    def POST(self):
        regId = web.input()['regId']
        #print "register dev:", regId
        # don't allow duplicates
        if regId not in reg_devs:
            #print "we don't have this device, add it"
            reg_devs.append(regId)
        #else:
            #print "we have this device already"

class unregister:
    def POST(self):
        regId = web.input()['regId']
        #print "unregister dev:", regId
        try:
            reg_devs.remove(regId)
        except:
            pass
            #"dont have it"

if __name__ == "__main__":
    app = web.application(urls, globals())
    app.internalerror = web.debugerror
    app.run()