code: def s3_bucket(self):
          
          if not hasattr(self, 'cached_bucket'):
              self.check_prerequisites()
              with PatchedBotoConfig():
                  from boto.exception import BotoClientError, BotoServerError, S3ResponseError
                  # The following try/except block translates unexpected exceptions
                  # raised by Boto into a CacheBackendError exception.
                  try:
                      # The following try/except block handles the expected exception
                      # raised by Boto when an Amazon S3 bucket does not exist.
                      try:
                          logger.debug("Connecting to Amazon S3 bucket: %s", self.config.s3_cache_bucket)
                          self.cached_bucket = self.s3_connection.get_bucket(self.config.s3_cache_bucket)
                      except S3ResponseError as e:
                          if e.status == 404 and self.config.s3_cache_create_bucket:
                              logger.info("Amazon S3 bucket doesn't exist yet, creating it now: %s",
                                          self.config.s3_cache_bucket)
                              self.s3_connection.create_bucket(self.config.s3_cache_bucket)
                              self.cached_bucket = self.s3_connection.get_bucket(self.config.s3_cache_bucket)
                          else:
                              # Don't swallow exceptions we can't handle.
                              raise
                  except (BotoClientError, BotoServerError):
                      raise CacheBackendError("""
                          Failed to connect to the configured Amazon S3 bucket
                          {bucket}! Are you sure the bucket exists and is accessible
                          using the provided credentials? The Amazon S3 cache backend
                          will be disabled for now.
                      """, bucket=repr(self.config.s3_cache_bucket))
          return self.cached_bucket
docs: Connect to the user defined Amazon S3 bucket.
  
          Called on demand by :func:`get()` and :func:`put()`. Caches its
          return value so that only a single connection is created.
  
          :returns: A :class:`boto.s3.bucket.Bucket` object.
          :raises: :exc:`.CacheBackendDisabledError` when the user hasn't
                   defined :attr:`.Config.s3_cache_bucket`.
          :raises: :exc:`.CacheBackendError` when the connection to the Amazon
                   S3 bucket fails.