Sort only part of an attribute in a list

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# Python script version

import fmeobjects

import re

AttrName = ['field0', 'field1', 'field2', 'field3']

def sortAttributes(feature):

    v = {}

    for n in AttrName:

        s = feature.getAttribute(n)

        if s and re.match('^.+_.+$', s): v[s.split('_')[-1]] = s

    i = 0

    for k in sorted(v.keys()):

        feature.setAttribute(AttrName[i], v[k])

        i = i + 1

    for j in range(i, len(AttrName)):

        feature.setAttribute(AttrName[j], '')