Python декодировать CP1251 -> UTF-8

import re

rus_alphabet=u"абвгдеёжзийклмнопрстуфхцчшщъыьэюяАБВГДЕЁЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯ0123456789 \n\t_-+=\/|\":;.,{}()*&^%$#@!~`'"
ra_re=re.compile(u"^["+re.escape(rus_alphabet)+u"]+$")

item_part="&BBoEHw-"

item_part_decoded=None
encoding=None

for enc in ('cp1251', 'cp866', 'koi8r', 'utf-8'):
    try:
        item_part_decoded=item_part.decode(enc)
        if ra_re.match(item_part_decoded):
            encoding=enc
            break
        else:
            item_part_decoded=None
    except:
        item_part_decoded=None
        continue

base64.b64decode('&BBoEHw-==').decode('utf-16be')

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