Python function that uses the Google Drive API to read documents from Google Drive

ReadGoogleDrive.py

import os
import pickle
from googleapiclient.discovery import build
from googleapiclient.http import MediaIoBaseDownload
from google_auth_oauthlib.flow import InstalledAppFlow
from google.auth.transport.requests import Request

# If modifying these SCOPES, delete the token.pickle file.
SCOPES = ['https://www.googleapis.com/auth/drive.readonly']

def authenticate_google_drive():
    creds = None
    # The file token.pickle stores the user's access and refresh tokens,
    # and is created automatically when the authorization flow completes
    # for the first time.
    if os.path.exists('token.pickle'):
        with open('token.pickle', 'rb') as token:
            creds = pickle.load(token)
    # If there are no (valid) credentials available, let the user log in.
    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)
        # Save the credentials for the next run
        with open('token.pickle', 'wb') as token:
            pickle.dump(creds, token)
    return creds

def read_google_doc(document_id):
    creds = authenticate_google_drive()
    service = build('drive', 'v3', credentials=creds)
    
    try:
        request = service.files().export_media(fileId=document_id,
                                               mimeType='application/pdf')
        fh = open(f'{document_id}.pdf', 'wb')
        downloader = MediaIoBaseDownload(fh, request)
        done = False
        while done is False:
            status, done = downloader.next_chunk()
            print(f'Download {int(status.progress() * 100)}%')
        fh.close()
        print(f'Document downloaded as {document_id}.pdf')
    except Exception as e:
        print(f'An error occurred: {e}')

if __name__ == '__main__':
    document_id = 'YOUR_DOCUMENT_ID'
    read_google_doc(document_id)