Gettext and changing translations on the fly

Gettext basics:

• Extracting translatable strings:
  xgettext --language=Python --keyword=_ --output=app.pot app.py

• Creating a new translation:
  msginit --input=app.pot --locale=en_CA
  Translate the msgstr inside the new file.

• Generate the .mo file (which is used by gettext):
  msgfmt --output-file=en_CA/LC_MESSAGES/app.mo en_CA.po

Information extracted from this page.

Using gettext inside Python (and changing language on the fly):

import gettext
import os

gettext.bindtextdomain('app', 'langs')
gettext.textdomain('app')
_ = gettext.gettext

os.environ['LANG'] = 'en'
print _('Translated message')

os.environ['LANG'] = 'pt_BR'
print _('Translated message')