Python utility to unpack zips with unusual file name encoding

unzip-enc.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# unzip-enc.py

import os, sys, argparse, locale, zipfile, codecs
from charamel import Detector

def setup_console(sys_enc="utf-8"):
    try:
        if sys.version_info >= (3, 4):
            importlib.reload(sys)
        elif sys.version_info >= (3, 0):
            imp.reload(sys)
        else:
            reload(sys)

        if sys.platform.startswith("win"):
            import ctypes
            enc = "cp{}".format(ctypes.windll.kernel32.GetOEMCP())
        else:
            enc = (sys.stdout.encoding if sys.stdout.isatty() else
                        sys.stderr.encoding if sys.stderr.isatty() else
                            sys.getfilesystemencoding() or sys_enc)

        sys.setdefaultencoding(sys_enc)

        if sys.stdout.isatty() and sys.stdout.encoding != enc:
            sys.stdout = codecs.getwriter(enc)(sys.stdout, 'replace')

        if sys.stderr.isatty() and sys.stderr.encoding != enc:
            sys.stderr = codecs.getwriter(enc)(sys.stderr, 'replace')
        return enc
    except:
        pass

console_chs = setup_console()
parser = argparse.ArgumentParser()
parser.add_argument("-e", help="encoding for file names like cp932, autodetected by default", metavar=('encoding'))
parser.add_argument("-l", help="list file names in a zip file but don't unzip", action="store_true")
parser.add_argument("file", help="zip archive to unpack", metavar=('filename'))
args = parser.parse_args()

zfn = args.file #.decode(console_chs)
print("Processing " + zfn + " ...")
detector = Detector()
with zipfile.ZipFile(zfn, "r") as zf:
    for name in zf.namelist():
        rawname = name.encode('cp437', 'ignore')
        enc = args.e if args.e else detector.detect(rawname)
        try:
            utf8name=rawname.decode(enc)
        except:
            print("Error [" + enc + "] " + name)
            utf8name = name
        if args.l:
            print("[" + enc + "] " + name)
        else:
            print("Extracting [" + enc + "]: " + utf8name)
            pathname = os.path.dirname(utf8name)
            if not os.path.exists(pathname) and pathname!= "":
                os.makedirs(pathname)
            if not os.path.exists(utf8name):
                with open(utf8name, 'wb') as fout:
                    fout.write(zf.read(name))