<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def put(self, filename, handle):
 """ Upload a distribution archive to the configured Amazon S3 bucket. If the :attr:`~.Config.s3_cache_readonly` configuration option is enabled this method does nothing. :param filename: The filename of the distribution archive (a string). :param handle: A file-like object that provides access to the distribution archive. :raises: :exc:`.CacheBackendError` when any underlying method fails. """

        if self.config.s3_cache_readonly:
            logger.info('Skipping upload to S3 bucket (using S3 in read only mode).')
        else:
            timer = Timer()
            self.check_prerequisites()
            with PatchedBotoConfig():
                from boto.s3.key import Key
                raw_key = self.get_cache_key(filename)
                logger.info("Uploading distribution archive to S3 bucket: %s", raw_key)
                key = Key(self.s3_bucket)
                key.key = raw_key
                try:
                    key.set_contents_from_file(handle)
                except Exception as e:
                    logger.info("Encountered error writing to S3 bucket, "
                                "falling back to read only mode (exception: %s)", e)
                    self.config.s3_cache_readonly = True
                else:
                    logger.info("Finished uploading distribution archive to S3 bucket in %s.", timer)