get_refresh_token.py

import httplib2
from oauth2client.client import flow_from_clientsecrets
from oauth2client.file import Storage
from oauth2client.tools import run_flow
from googleapiclient import discovery

# Start the OAuth flow to retrieve credentials
def authorize_credentials():
    CLIENT_SECRET = 'client_secret.json'
    SCOPE = 'https://www.googleapis.com/auth/blogger'
    STORAGE = Storage('credentials.storage.json')
    credentials = STORAGE.get()
    if credentials is None or credentials.invalid:
        flow = flow_from_clientsecrets(CLIENT_SECRET, scope=SCOPE)
        http = httplib2.Http()
        credentials = run_flow(flow, STORAGE, http=http)
    return credentials

def getBloggerService():
    credentials = authorize_credentials()
    http = credentials.authorize(httplib2.Http())
    discoveryUrl = ('https://blogger.googleapis.com/$discovery/rest?version=v3')
    service = discovery.build('blogger', 'v3', http=http, discoveryServiceUrl=discoveryUrl)
    return service

if __name__ == '__main__':
    try:
        getBloggerService()
    except Exception as e:
        print(str(e))