Can not find python boto3 batch_write response

The following code writes items into Dynamodb in batch:

with table.batch_writer() as batch:
  for item in chunk:   
   dynamodb_item = {
           'itemId': item['key'],
            'time': item['time'],
             'value': item['value']
                }                    
    batch.put_item( Item = dynamodb_item )     

As stated in the following docs, if the batch call fails it returns the unprocessed items: https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/dynamodb.html#DynamoDB.Client.batch_write_item

In boto3, how can I get the unprocessed items in the response?

How can I figure out if it's all handled successfully or if the call response has unprocessed items?

Use batch_write_item as you mentioned, instead of put_item

Check this example:

response = await client.batch_write_item(
    RequestItems=request_items
)

if len(response['UnprocessedItems']) == 0:
    print('Wrote 25 items to dynamo')
else:
    await asyncio.sleep(5)

    unprocessed_items = response['UnprocessedItems']
    # proceed with unprocessed_items