a method to retrieve data for a file housed on telegram api

        :param file_route: string with route to file endpoint on telegram api
        :return: byte data stream with file data

def get_file(self, file_route, file_name=''):

        ''' a method to retrieve data for a file housed on telegram api

        :param file_route: string with route to file endpoint on telegram api
        :return: byte data stream with file data
        '''

        title = '%s.get_file' % self.__class__.__name__

    # construct file url
        file_url = '%s%s' % (self.file_endpoint, file_route)

    # send request for file data
        data_buffer = self._get_data(file_url, file_name, method_title=title)

        return data_buffer