A sample code to access Google Sheet in Python

sheet.py

# See: https://developers.google.com/sheets/api/quickstart/python
import pickle
import os.path
from googleapiclient.discovery import build
from google_auth_oauthlib.flow import InstalledAppFlow
from google.auth.transport.requests import Request

SCOPES = ['https://www.googleapis.com/auth/spreadsheets'] # read/write access

SHEET_ID = '<sheet_id>'
RANGE_NAME = 'original!A1:A1'

def main():
    creds = auth()
    values = get_values(creds)

    if not values:
        print('No data found.')
    else:
        for row in values:
            print('%s' % row[0])

def auth():
    creds = None
    if os.path.exists('token.pickle'):
        with open('token.pickle', 'rb') as token:
            creds = pickle.load(token)
    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()
        with open('token.pickle', 'wb') as token:
            pickle.dump(creds, token)
    return creds

def get_values(creds):
    service = build('sheets', 'v4', credentials=creds)

    # Call the Sheets API
    sheet = service.spreadsheets()
    result = sheet.values().get(spreadsheetId=SHEET_ID, range=RANGE_NAME).execute()
    return result.get('values', [])

if __name__ == '__main__':
    main()