aiohttp_babel

aiohttp_babel adds i18n and l10n support to aiohttp.

Usage:

import aiohttp_jinja2
from aiohttp.web import Application
from aiohttp_babel.locale import (load_gettext_translations,
                                  set_default_locale,
                                  set_locale_detector)
from aiohttp_babel.middlewares import babel_middleware, _


set_default_locale('en_GB')  # set default locale, if necessary
# load compiled locales
load_gettext_translations('/path/to/locales', 'domain')

# you can use your own locale detection method, if necessary.
# aiohttp_babel checks cookie parameter `locale` or `Accept-Language`
# header by default.
def detector(request):
    if request.url.host == 'es.example.com':
        return 'es'
    elif request.url.host == 'zh.example.com':
        return 'zh'
    else:
        return 'en'
set_locale_detector(detector)

jinja_loader = jinja2.FileSystemLoader('./templates')
app = Application(middlewares=[babel_middleware])

aiohttp_jinja2.setup(app, loader=jinja_loader)
jinja_env = aiohttp_jinja2.get_env(app)
jinja_env.globals['_'] = _

How to extract & compile locales:

http://babel.pocoo.org/en/latest/messages.html

http://babel.pocoo.org/en/latest/cmdline.html

Code from:

tornado-babel: https://github.com/openlabs/tornado-babel

django-babel: https://github.com/python-babel/django-babel