How do I access the Twitter API within a django celery task?

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Python

Django

I have the following function in my views.py that will send me the authorised user's key tokens. I can then manually amend these tokens for my Twitter API function locally to run the program.

def like(request):
   oauth = tweepy.OAuthHandler(CONSUMER_KEY, CONSUMER_SECRET)
   access_key = request.session['access_key_tw']
   access_secret = request.session['access_secret_tw']

   send_mail(
       'Auth Codes', # subject
       'access key -  ' + os.environ['oaccess_key'] + '\n' + 'access_secret -  ' + os.environ['oaccess_secret'], # message
       DEFAULT_FROM_EMAIL, # from email
       [DEFAULT_FROM_EMAIL],
       )

   return render(request, "home.html")

However having to do this manually isn't great and for security reasons I'd rather not have them emailed. I want to push the function to a celery task so that I don't need the sendmail() at all. My celery task would look like this after liking.delay() being called within like() -

@app.task(bind=True)
def liking(self):

    oauth = tweepy.OAuthHandler(CONSUMER_KEY, CONSUMER_SECRET)
    oauth.set_access_token(access_key, access_secret)
    api = tweepy.API(oauth)

    ** Rest of my code using the Twitter API **

What I have tried:

I have tried simply importing the variables or adding making them global but Heroku will not let me deploy when doing this.

I have also tried to set the access_key and access_secret as environment variables but this returns as 'none'.