def aliasmbcs():
    if sys.platform == 'win32':
        import locale, codecs
        enc = locale.getdefaultlocale()[1]
        if enc.startswith('cp'):            # "cp***" ?
            try:
                codecs.lookup(enc)
            except LookupError:
                import encodings
                encodings._cache[enc] = encodings._unknown
                encodings.aliases.aliases[enc] = 'mbcs'
On Windows, some default encodings are not provided by Python,
dataset/ETHPy150Open babble/babble/include/jython/Lib/site.py/aliasmbcs