src/anthropic/resources/beta/messages/batches.py [106:151]:
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        self,
        message_batch_id: str,
        *,
        betas: List[AnthropicBetaParam] | NotGiven = NOT_GIVEN,
        # Use the following arguments if you need to pass additional parameters to the API that aren't available via kwargs.
        # The extra values given here take precedence over values defined on the client or passed to this method.
        extra_headers: Headers | None = None,
        extra_query: Query | None = None,
        extra_body: Body | None = None,
        timeout: float | httpx.Timeout | None | NotGiven = NOT_GIVEN,
    ) -> BetaMessageBatch:
        """This endpoint is idempotent and can be used to poll for Message Batch
        completion.

        To access the results of a Message Batch, make a request to the
        `results_url` field in the response.

        Learn more about the Message Batches API in our
        [user guide](/en/docs/build-with-claude/batch-processing)

        Args:
          message_batch_id: ID of the Message Batch.

          betas: Optional header to specify the beta version(s) you want to use.

          extra_headers: Send extra headers

          extra_query: Add additional query parameters to the request

          extra_body: Add additional JSON properties to the request

          timeout: Override the client-level default timeout for this request, in seconds
        """
        if not message_batch_id:
            raise ValueError(f"Expected a non-empty value for `message_batch_id` but received {message_batch_id!r}")
        extra_headers = {
            **strip_not_given(
                {
                    "anthropic-beta": ",".join(chain((str(e) for e in betas), ["message-batches-2024-09-24"]))
                    if is_given(betas)
                    else NOT_GIVEN
                }
            ),
            **(extra_headers or {}),
        }
        extra_headers = {"anthropic-beta": "message-batches-2024-09-24", **(extra_headers or {})}
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src/anthropic/resources/beta/messages/batches.py [493:538]:
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        self,
        message_batch_id: str,
        *,
        betas: List[AnthropicBetaParam] | NotGiven = NOT_GIVEN,
        # Use the following arguments if you need to pass additional parameters to the API that aren't available via kwargs.
        # The extra values given here take precedence over values defined on the client or passed to this method.
        extra_headers: Headers | None = None,
        extra_query: Query | None = None,
        extra_body: Body | None = None,
        timeout: float | httpx.Timeout | None | NotGiven = NOT_GIVEN,
    ) -> BetaMessageBatch:
        """This endpoint is idempotent and can be used to poll for Message Batch
        completion.

        To access the results of a Message Batch, make a request to the
        `results_url` field in the response.

        Learn more about the Message Batches API in our
        [user guide](/en/docs/build-with-claude/batch-processing)

        Args:
          message_batch_id: ID of the Message Batch.

          betas: Optional header to specify the beta version(s) you want to use.

          extra_headers: Send extra headers

          extra_query: Add additional query parameters to the request

          extra_body: Add additional JSON properties to the request

          timeout: Override the client-level default timeout for this request, in seconds
        """
        if not message_batch_id:
            raise ValueError(f"Expected a non-empty value for `message_batch_id` but received {message_batch_id!r}")
        extra_headers = {
            **strip_not_given(
                {
                    "anthropic-beta": ",".join(chain((str(e) for e in betas), ["message-batches-2024-09-24"]))
                    if is_given(betas)
                    else NOT_GIVEN
                }
            ),
            **(extra_headers or {}),
        }
        extra_headers = {"anthropic-beta": "message-batches-2024-09-24", **(extra_headers or {})}
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