def get_region(b):
    """Tries to get the bucket region from Location.LocationConstraint

    Special cases:
        LocationConstraint EU defaults to eu-west-1
        LocationConstraint null defaults to us-east-1

    Args:
        b (object): A bucket object

    Returns:
        string: an aws region string
    """
    remap = {None: 'us-east-1', 'EU': 'eu-west-1'}
    region = b.get('Location', {}).get('LocationConstraint')
    return remap.get(region, region)