docs: def request_quotes(tickers_list, selected_columns=['*']):
      """Request Yahoo Finance recent quotes.
  
      Returns quotes information from YQL. The columns to be requested are
      listed at selected_columns. Check `here <http://goo.gl/8AROUD>`_ for more
      information on YQL.
  
      >>> request_quotes(['AAPL'], ['Name', 'PreviousClose'])
      {
          'PreviousClose': '95.60',
          'Name': 'Apple Inc.'
      }
  
      :param table: Table name.
      :type table: string
      :param tickers_list: List of tickers that will be returned.
      :type tickers_list: list of strings
      :param selected_columns: List of columns to be returned, defaults to ['*']
      :type selected_columns: list of strings, optional
      :returns: Requested quotes.
      :rtype: json
      :raises: TypeError, TypeError
      """
      __validate_list(tickers_list)
      __validate_list(selected_columns)
      query = 'select {cols} from yahoo.finance.quotes where symbol in ({vals})'
      query = query.format(
          cols=', '.join(selected_columns),
          vals=', '.join('"{0}"'.format(s) for s in tickers_list)
      )
  
      response = __yahoo_request(query)
  
      if not response:
          raise RequestError('Unable to process the request. Check if the ' +
                             'columns selected are valid.')
  
      if not type(response['quote']) is list:
          return [response['quote']]
      return response['quote']