code: def login_open_sheet(oauth_key_file, spreadsheet):
      
      try:
          scope =  ['https://spreadsheets.google.com/feeds']
          credentials = ServiceAccountCredentials.from_json_keyfile_name(oauth_key_file, scope)
          gc = gspread.authorize(credentials)
          worksheet = gc.open(spreadsheet).sheet1
          return worksheet
      except Exception as ex:
          print('Unable to login and get spreadsheet.  Check OAuth credentials, spreadsheet name, and make sure spreadsheet is shared to the client_email address in the OAuth .json file!')
          print('Google sheet login failed with error:', ex)
          sys.exit(1)
docs: Connect to Google Docs spreadsheet and return the first worksheet.