[Python] googleapi python how to fetch / refresh access token

I am trying to setup Google Analytics to one of my blog website. I am using the google api client library. The code works fine if I manually get the access token from the site: https://developers.google.com/oauthplayground/. I am finding difficult to have the access_token refreshed. Can someone please guide me on this, as am pretty new to Google Analytics. Will share the python code snippet please.

import httplib2
import httplib2 as lib2
import google.oauth2.credentials
# from google.auth.transport import requests
import requests
from google_auth_httplib2 import AuthorizedHttp
from oauth2client import client, GOOGLE_TOKEN_URI

from googleapiclient.discovery import build as google_build

# This is consistent for all Google services
token_uri = 'https://accounts.google.com/o/oauth2/token'

# WORKING CODE BUT REQUIRES VALID ACCESS_TOKEN
credentials = google.oauth2.credentials.Credentials(None,
refresh_token=refresh_token,
token_uri='https://accounts.google.com/o/oauth2/token',
client_id=client_id,
client_secret=client_secret)

credentials = google.oauth2.credentials.Credentials(access_token)
authorized = AuthorizedHttp(credentials=credentials)
print(access_token)

# API Name and Verison, these don't change until
# they release a new API version for us to play with.
api_name = 'analyticsreporting'
api_version = 'v4'

# Let's build the client
api_client = google_build(serviceName=api_name, version=api_version, http=authorized)

sample_request = {
'viewId': 'xxxxxxxx',
'dateRanges': {
'startDate': datetime.strftime(datetime.now() - timedelta(days=120), '%Y-%m-%d'),
'endDate': datetime.strftime(datetime.now(), '%Y-%m-%d')
},
'dimensions': [{'name': 'ga:date'}],
'metrics': [{'expression': 'ga:sessions'}]
}

response = api_client.reports().batchGet(
body={
'reportRequests': sample_request
}).execute()
print(response)


I have kept the ACCESS_TOKEN as none to fetch the initial access token, which seems to work, when I print it, but i couldnt get a way to refresh this access_token, using this credential api, since this doesnt have expires_at or expiry attributes as well. The URL Scope would be 'https://www.googleapis.com/auth/analytics.readonly'

When running the above code to refresh ACCESS TOKEN, am getting the error:

Traceback (most recent call last):
File "E:/PyCharm_Workspace/MLPractices/GA3.py", line 78, in <module>
'reportRequests': sample_request
File "E:\PyCharm_Workspace\MLPractices\venv\lib\site-packages\googleapiclient\_helpers.py", line 134, in positional_wrapper
return wrapped(*args, **kwargs)
File "E:\PyCharm_Workspace\MLPractices\venv\lib\site-packages\googleapiclient\http.py", line 901, in execute
headers=self.headers,
File "E:\PyCharm_Workspace\MLPractices\venv\lib\site-packages\googleapiclient\http.py", line 177, in _retry_request
resp, content = http.request(uri, method, *args, **kwargs)
File "E:\PyCharm_Workspace\MLPractices\venv\lib\site-packages\google_auth_httplib2.py", line 213, in request
self.credentials.refresh(self._request)
File "E:\PyCharm_Workspace\MLPractices\venv\lib\site-packages\google\oauth2\credentials.py", line 172, in refresh
"The credentials do not contain the necessary fields need to "
google.auth.exceptions.RefreshError: The credentials do not contain the necessary fields need to refresh the access token. You must specify refresh_token, token_uri, client_id, and client_secret.


Thanks in advance

Yuva

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