TL;DR

Install l10n:

python3 -m pip install 'l10n[cli]'

And there are all the changes you need to do in your code to support translations for a string:

from l10n import Locales
locales = Locales()

def say_hello(lang='en'):
    loc = locales[lang]
    msg = loc.get('Hello, world!')
    print(msg)

Now, let’s translate it to Ukrainian:

1. Extract all strings from the code that need to be translated:

   python3 -m l10n extract --lang uk
   

2. Translate all extracted strings using Google Translate:

   python3 -m l10n translate
   

3. Compile all translations into the binary format:

   python3 -m l10n compile
   

That’s all! Now, your code supports translations:

from example import say_hello
say_hello(lang='uk')
# Привіт Світ!

If you want to manually adjust the translation text, just edit the languages/en.po file and run compile again. You don’t even need to restart your app!

Read more in the documentation: l10n.orsinium.dev.