def SIMPLE(val):
    '''
    This is a basic case-sensitive "sorted order" index keygen function for
    strings. This will return a value that is suitable to be used for ordering
    by a 7-byte prefix of a string (that is 7 characters from a byte-string, and
    1.75-7 characters from a unicode string, depending on character -> encoding
    length).

    .. warning:: Case sensitivity is based on the (encoded) byte prefixes of the
        strings/text being indexed, so ordering *may be different* than a native
        comparison ordering (especially if an order is different based on
        characters past the 7th encoded byte).
    '''
    if not val:
        return None
    if not isinstance(val, six.string_types):
        if six.PY3 and isinstance(val, bytes):
            val = val.decode('latin-1')
        else:
            val = str(val)
    return {'': _prefix_score(val)}
This is a basic case-sensitive "sorted order" index keygen function for
    strings. This will return a value that is suitable to be used for ordering
    by a 7-byte prefix of a string (that is 7 characters from a byte-string, and
    1.75-7 characters from a unicode string, depending on character -> encoding
    length).

    .. warning:: Case sensitivity is based on the (encoded) byte prefixes of the
        strings/text being indexed, so ordering *may be different* than a native
        comparison ordering (especially if an order is different based on
        characters past the 7th encoded byte).