def resize(<EOL>self, pool_id, pool_resize_parameter, pool_resize_options=None, custom_headers=None, raw=False, **operation_config):
timeout = None<EOL>if pool_resize_options is not None:<EOL><INDENT>timeout = pool_resize_options.timeout<EOL><DEDENT>client_request_id = None<EOL>if pool_resize_options is not None:<EOL><INDENT>client_request_id = pool_resize_options.client_request_id<EOL><DEDENT>return_client_request_id = None<EOL>if pool_resize_options is not None:<EOL><INDENT>return_client_request_id = pool_resize_options.return_client_request_id<EOL><DEDENT>ocp_date = None<EOL>if pool_resize_options is not None:<EOL><INDENT>ocp_date = pool_resize_options.ocp_date<EOL><DEDENT>if_match = None<EOL>if pool_resize_options is not None:<EOL><INDENT>if_match = pool_resize_options.if_match<EOL><DEDENT>if_none_match = None<EOL>if pool_resize_options is not None:<EOL><INDENT>if_none_match = pool_resize_options.if_none_match<EOL><DEDENT>if_modified_since = None<EOL>if pool_resize_options is not None:<EOL><INDENT>if_modified_since = pool_resize_options.if_modified_since<EOL><DEDENT>if_unmodified_since = None<EOL>if pool_resize_options is not None:<EOL><INDENT>if_unmodified_since = pool_resize_options.if_unmodified_since<EOL><DEDENT>url = self.resize.metadata['<STR_LIT:url>']<EOL>path_format_arguments = {<EOL>'<STR_LIT>': self._serialize.url("<STR_LIT>", self.config.batch_url, '<STR_LIT:str>', skip_quote=True),<EOL>'<STR_LIT>': self._serialize.url("<STR_LIT>", pool_id, '<STR_LIT:str>')<EOL>}<EOL>url = self._client.format_url(url, **path_format_arguments)<EOL>query_parameters = {}<EOL>query_parameters['<STR_LIT>'] = self._serialize.query("<STR_LIT>", self.api_version, '<STR_LIT:str>')<EOL>if timeout is not None:<EOL><INDENT>query_parameters['<STR_LIT>'] = self._serialize.query("<STR_LIT>", timeout, '<STR_LIT:int>')<EOL><DEDENT>header_parameters = {}<EOL>header_parameters['<STR_LIT:Content-Type>'] = '<STR_LIT>'<EOL>if self.config.generate_client_request_id:<EOL><INDENT>header_parameters['<STR_LIT>'] = str(uuid.uuid1())<EOL><DEDENT>if custom_headers:<EOL><INDENT>header_parameters.update(custom_headers)<EOL><DEDENT>if self.config.accept_language is not None:<EOL><INDENT>header_parameters['<STR_LIT>'] = self._serialize.header("<STR_LIT>", self.config.accept_language, '<STR_LIT:str>')<EOL><DEDENT>if client_request_id is not None:<EOL><INDENT>header_parameters['<STR_LIT>'] = self._serialize.header("<STR_LIT>", client_request_id, '<STR_LIT:str>')<EOL><DEDENT>if return_client_request_id is not None:<EOL><INDENT>header_parameters['<STR_LIT>'] = self._serialize.header("<STR_LIT>", return_client_request_id, '<STR_LIT:bool>')<EOL><DEDENT>if ocp_date is not None:<EOL><INDENT>header_parameters['<STR_LIT>'] = self._serialize.header("<STR_LIT>", ocp_date, '<STR_LIT>')<EOL><DEDENT>if if_match is not None:<EOL><INDENT>header_parameters['<STR_LIT>'] = self._serialize.header("<STR_LIT>", if_match, '<STR_LIT:str>')<EOL><DEDENT>if if_none_match is not None:<EOL><INDENT>header_parameters['<STR_LIT>'] = self._serialize.header("<STR_LIT>", if_none_match, '<STR_LIT:str>')<EOL><DEDENT>if if_modified_since is not None:<EOL><INDENT>header_parameters['<STR_LIT>'] = self._serialize.header("<STR_LIT>", if_modified_since, '<STR_LIT>')<EOL><DEDENT>if if_unmodified_since is not None:<EOL><INDENT>header_parameters['<STR_LIT>'] = self._serialize.header("<STR_LIT>", if_unmodified_since, '<STR_LIT>')<EOL><DEDENT>body_content = self._serialize.body(pool_resize_parameter, '<STR_LIT>')<EOL>request = self._client.post(url, query_parameters, header_parameters, body_content)<EOL>response = self._client.send(request, stream=False, **operation_config)<EOL>if response.status_code not in [<NUM_LIT>]:<EOL><INDENT>raise models.BatchErrorException(self._deserialize, response)<EOL><DEDENT>if raw:<EOL><INDENT>client_raw_response = ClientRawResponse(None, response)<EOL>client_raw_response.add_headers({<EOL>'<STR_LIT>': '<STR_LIT:str>',<EOL>'<STR_LIT>': '<STR_LIT:str>',<EOL>'<STR_LIT>': '<STR_LIT:str>',<EOL>'<STR_LIT>': '<STR_LIT>',<EOL>'<STR_LIT>': '<STR_LIT:str>',<EOL>})<EOL>return client_raw_response<EOL><DEDENT>
Changes the number of compute nodes that are assigned to a pool.

        You can only resize a pool when its allocation state is steady. If the
        pool is already resizing, the request fails with status code 409. When
        you resize a pool, the pool's allocation state changes from steady to
        resizing. You cannot resize pools which are configured for automatic
        scaling. If you try to do this, the Batch service returns an error 409.
        If you resize a pool downwards, the Batch service chooses which nodes
        to remove. To remove specific nodes, use the pool remove nodes API
        instead.

        :param pool_id: The ID of the pool to resize.
        :type pool_id: str
        :param pool_resize_parameter: The parameters for the request.
        :type pool_resize_parameter: ~azure.batch.models.PoolResizeParameter
        :param pool_resize_options: Additional parameters for the operation
        :type pool_resize_options: ~azure.batch.models.PoolResizeOptions
        :param dict custom_headers: headers that will be added to the request
        :param bool raw: returns the direct response alongside the
         deserialized response
        :param operation_config: :ref:`Operation configuration
         overrides<msrest:optionsforoperations>`.
        :return: None or ClientRawResponse if raw=true
        :rtype: None or ~msrest.pipeline.ClientRawResponse
        :raises:
         :class:`BatchErrorException<azure.batch.models.BatchErrorException>`