<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def extract(self, file_path):
 """ Extract a tar file at the specified file path. """

        import tarfile

        print('Extracting {}'.format(file_path))

        if not os.path.exists(self.extracted_data_directory):
            os.makedirs(self.extracted_data_directory)

        def track_progress(members):
            sys.stdout.write('.')
            for member in members:
                # This will be the current file being extracted
                yield member

        with tarfile.open(file_path) as tar:
            tar.extractall(path=self.extracted_data_directory, members=track_progress(tar))

        self.chatbot.logger.info('File extracted to {}'.format(self.extracted_data_directory))

        return True