def _field_name(name, prefix=None):
    """
    Util for quick prefixes

    >>> _field_name(1)
    '1'
    >>> _field_name("henk")
    'henk'
    >>> _field_name("henk", 1)
    '1henk'
    """
    if prefix is None:
        return str(name)
    return "%s%s" % (prefix, name)