use the calendar google-api from python as a service

cal.py

'''
Go to https://code.google.com/apis/console/ and:
- create a new project, 
- enable access to the calendar api, 
- create a "service account" - that will give you an:
  * "email address" which is the service_account_name and
  * a private key that you need to save on you server
- go to the calendar and share it with the "email address" from above

Make sure your time is synchronized.

requirements are: google-api-python-client and pyOpenSSL
    pip install google-api-python-client pyOpenSSL
'''

import pprint
import pytz
from datetime import datetime, timedelta
import httplib2

from apiclient.discovery import build
from oauth2client.client import SignedJwtAssertionCredentials


with open('privatekey.p12', 'rb') as f:
    key = f.read()

service_account_name = '...@developer.gserviceaccount.com'
calendarId = '...@group.calendar.google.com'

credentials = SignedJwtAssertionCredentials(
    service_account_name, key,
    scope=['https://www.googleapis.com/auth/calendar',
           'https://www.googleapis.com/auth/calendar.readonly'])

http = httplib2.Http()
http = credentials.authorize(http)

service = build(serviceName='calendar', version='v3', http=http)

lists = service.calendarList().list().execute()
pprint.pprint(lists)
print

# get events from calendar for the next 3 days
cest = pytz.timezone('Europe/Skopje')
now = datetime.now(tz=cest) # timezone?
timeMin = datetime(year=now.year, month=now.month, day=now.day, tzinfo=cest) + timedelta(days=1)
timeMin = timeMin.isoformat()
timeMax = datetime(year=now.year, month=now.month, day=now.day, tzinfo=cest) + timedelta(days=3)
timeMax = timeMax.isoformat()

events = service.events().list(calendarId=calendarId,
          timeMin=timeMin, timeMax=timeMax).execute()

pprint.pprint(events)

hello gdamjan
are you still able to execute this code with the new version of calendar API. If yes, can you please help me understand some of the terms you used here?