Find and return a serializer for the given format.

    Arguments:
    format -- A Format instance.

def find(format):
    """
    Find and return a serializer for the given format.

    Arguments:
    format -- A Format instance.
    """
    try:
        serializer = SERIALIZERS[format]
    except KeyError:
        raise UnknownSerializer('No serializer found for %s' % format.acronym)

    return serializer