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    **Example:**
    ::
        from botocore.session import Session

        s3 = Session().create_client('s3')
        response = s3.select_object_content(
            Bucket='bucketname',
            Key='keyname',
            ExpressionType='SQL',
            RequestProgress={'Enabled': True},
            Expression="SELECT * FROM S3Object s",
            InputSerialization={'CSV': {}},
            OutputSerialization={'CSV': {}},
        )
        # This is the event stream in the response
        event_stream = response['Payload']
        end_event_received = False
        with open('output', 'wb') as f:
            # Iterate over events in the event stream as they come
            for event in event_stream:
                # If we received a records event, write the data to a file
                if 'Records' in event:
                    data = event['Records']['Payload']
                    f.write(data)
                # If we received a progress event, print the details
                elif 'Progress' in event:
                    print(event['Progress']['Details'])
                # End event indicates that the request finished successfully
                elif 'End' in event:
                    print('Result is complete')
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        if not end_event_received:
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