gettextを使うとPythonのスクリプトを多言語対応することができます。

gettextを使った多言語対応のサンプル

gettext-sample.py

#!/usr/bin/env python
# coding: utf-8

import gettext

_ = gettext.translation( \
      domain='message',
      localedir='locale',
      languages=['ja'],
      fallback=True).ugettext

print(_(u'hello, world!'))

message.po

# SOME DESCRIPTIVE TITLE.
# Copyright (C) YEAR ORGANIZATION
# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
#
msgid ""
msgstr ""
"Project-Id-Version: PACKAGE VERSION\n"
"POT-Creation-Date: 2013-03-22 00:57+JST\n"
"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
"Language-Team: LANGUAGE <LL@li.org>\n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"
"Generated-By: pygettext.py 1.5\n"


#: gettext-sample.py:12
msgid "hello, world!"
msgstr "こんにちは世界!"

ファイルの配置

.
|-- gettext-sample.py
|-- locale
    `-- ja
        `-- LC_MESSAGES
            `-- message.mo

3 directories, 2 files

スクリプトの実行結果

$ python gettext-sample.py
こんにちは世界