Authorizationcode.py

from __future__ import print_function
import os.path
from google.auth.transport.requests import Request
from google.oauth2.credentials import Credentials
from google_auth_oauthlib.flow import InstalledAppFlow
from googleapiclient.discovery import build

# Scope for full Gmail read access
SCOPES = ['https://www.googleapis.com/auth/gmail.readonly']

def main():
    creds = None
    # token.json stores the user's access and refresh tokens
    if os.path.exists('token.json'):
        creds = Credentials.from_authorized_user_file('token.json', SCOPES)

    if not creds or not creds.valid:
        if creds and creds.expired and creds.refresh_token:
            creds.refresh(Request())
        else:
            flow = InstalledAppFlow.from_client_secrets_file('credentials.json', SCOPES)
            creds = flow.run_local_server(port=0)
        with open('token.json', 'w') as token:
            token.write(creds.to_json())

    service = build('gmail', 'v1', credentials=creds)

    # Get list of labels
    results = service.users().labels().list(userId='me').execute()
    labels = results.get('labels', [])
    print('Labels:')
    for label in labels:
        print(label['name'])

if __name__ == '__main__':
    main()