<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def is_downloaded(self, file_path):
 """ Check if the data file is already downloaded. """

        if os.path.exists(file_path):
            self.chatbot.logger.info('File is already downloaded')
            return True

        return False