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Ok I have the following app:

babel.cfg

[python: **.py] [jinja2: **/templates/**.html] extensions=jinja2.ext.autoescape,jinja2.ext.with_

lucy/init.py

babel = Babel() def create_app(object_name): app = Flask(__name__) app.config.from_object(object_name) app.register_blueprint(main_blueprint) app.register_blueprint(category_blueprint) app.register_blueprint(item_blueprint) babel.init_app(app) db.init_app(app) return app @babel.localeselector def get_locale(): return 'de'

lucy/controllers/main.py

main_blueprint = Blueprint( 'main', __name__, template_folder='../templates/main', ) @main_blueprint.route('/debug') def debug(): print get_locale() return gettext('A simple string')

I ran the following commands:

  1. pybabel extract -F babel.cfg -o messages.pot .
  2. pybabel init -i messages.pot -d translations -l de
  3. pybabel compile -d translations/

This is what my project structure looks like: 

. |-- README.md |-- babel.cfg |-- fabfile.py |-- lucy | |-- __init__.py | |-- config.py | |-- controllers | | |-- __init__.py | | |-- category.py | | |-- item.py | | `-- main.py | |-- forms.py | |-- models.py | |-- static | | |-- css | | `-- js | `-- templates | |-- boilerplate | | |-- items.html | | `-- layout.html | |-- category | | `-- show.html | |-- item | | |-- index.html | | `-- show.html | `-- main | `-- signup.html |-- manage.py |-- messages.pot |-- requirements.txt |-- tests | |-- __init__.py | `-- test_models.py `-- translations `-- de `-- LC_MESSAGES |-- messages.mo `-- messages.po

These are the results from translation:

messages.pot

# Translations template for PROJECT. # Copyright (C) 2016 ORGANIZATION # This file is distributed under the same license as the PROJECT project. # FIRST AUTHOR <EMAIL@ADDRESS>, 2016. # #, fuzzy msgid "" msgstr "" "Project-Id-Version: PROJECT VERSION\n" "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n" "POT-Creation-Date: 2016-07-19 16:07+0800\n" "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n" "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n" "Language-Team: LANGUAGE <[email protected]>\n" "MIME-Version: 1.0\n" "Content-Type: text/plain; charset=utf-8\n" "Content-Transfer-Encoding: 8bit\n" "Generated-By: Babel 2.3.4\n" #: lucy/controllers/main.py:20 msgid "A simple string" msgstr ""

translation/de/LC_MESSAGES/message.po

# German translations for PROJECT. # Copyright (C) 2016 ORGANIZATION # This file is distributed under the same license as the PROJECT project. # FIRST AUTHOR <EMAIL@ADDRESS>, 2016. # msgid "" msgstr "" "Project-Id-Version: PROJECT VERSION\n" "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n" "POT-Creation-Date: 2016-07-19 16:07+0800\n" "PO-Revision-Date: 2016-07-19 16:07+0800\n" "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n" "Language: de\n" "Language-Team: de <[email protected]>\n" "Plural-Forms: nplurals=2; plural=(n != 1)\n" "MIME-Version: 1.0\n" "Content-Type: text/plain; charset=utf-8\n" "Content-Transfer-Encoding: 8bit\n" "Generated-By: Babel 2.3.4\n" #: lucy/controllers/main.py:20 msgid "A simple string" msgstr "german string berlin"

translation/de/LC_MESSAGES/message.mo

??,<=?M?A simple stringProject-Id-Version: PROJECT VERSION Report-Msgid-Bugs-To: EMAIL@ADDRESS POT-Creation-Date: 2016-07-19 16:07+0800 PO-Revision-Date: 2016-07-19 16:07+0800 Last-Translator: FULL NAME <EMAIL@ADDRESS> Language: de Language-Team: de <[email protected]> Plural-Forms: nplurals=2; plural=(n != 1) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Generated-By: Babel 2.3.4 german string berlin

When I visit /debug, I see that my locale is de. However, I still see A simple string being outputted. Any ideas why?

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6
  • 3
    try using lazy_gettext. Commented Jul 19, 2016 at 8:43
  • I tried - that didn't work. Why would it make a difference? Commented Jul 19, 2016 at 8:52
  • 2
    I found out what went wrong. After an hour of printing debug statements in my virtual env library I realized they were looking for the translations folder at the Lucy/lucy directory rather than the Lucy directory... Commented Jul 19, 2016 at 17:02
  • 1
    @Sparrowcide how did you fix it? Commented Sep 25, 2017 at 13:51
  • 1
    I know I'm late but for me using lazy_gettext works. The problem is that form works outside the request lifecycle, so using gettext() they are evaluated before the are actually used. Using lazy_gettext they are evaluated at time of using. Commented Mar 20, 2020 at 13:54

3 Answers 3

Reset to default
10

For me the solution was to set the BABEL_TRANSLATION_DIRECTORIES variable. It contains a string with paths separated by ';'.

In my config (only one location):

BABEL_TRANSLATION_DIRECTORIES = '/home/work/python/project/translations'

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2 Comments

Was this in your babel.cfg file?
@StanJames this would be in the app.config object app.config['BABEL_TRANSLATION_DIRECTORIES'] You should be setting this somewhere along with, for example SQLALCHEMY_DATABASE_URI - this might be being read from a config file
5

My answer is the same as fmelan's, but I use absolute path:

from flask import Flask import os base_dir = os.path.abspath(os.path.dirname(__file__)) app = Flask(__name__) app.config["BABEL_TRANSLATION_DIRECTORIES"] = os.path.join(base_dir, "app/translation")
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3

Expanding from fmelan's answer: if your translations directory is on the same place as your flask_app.py, then you can just do:

app.config['BABEL_TRANSLATION_DIRECTORIES'] = './translations'

...and stop worrying on whether the absolute path works wherever the app is running.

For me this nicely solved a quite weird behaviour when deploying the page to PythonAnywhere.

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2 Comments

As of flask-babel 2.0, this seems to already be the default
Maybe, but I guess PythonAnywhere messes with the absolute paths, and so I had to include that for it to work.

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