def s3_bucket_location_constraint(region):
    """Returns the appropriate LocationConstraint info for a new S3 bucket.

    When creating a bucket in a region OTHER than us-east-1, you need to
    specify a LocationConstraint inside the CreateBucketConfiguration argument.
    This function helps you determine the right value given a given client.

    Args:
        region (str): The region where the bucket will be created in.

    Returns:
        string: The string to use with the given client for creating a bucket.
    """
    if region == 'us-east-1':
        return ''
    return region
