i18n and l10n support for Flask based on Babel and pytz

Flask Babel - 0.11.1 Implements i18n and l10n support for Flask. This is based on the Python babel module as well as pytz both of which are installed automatically for you if you install this library. Documention

Flask Babel - 1.0.0

Implements i18n and l10n support for Flask. This is based on the Python babel module as well as pytz both of which are installed automatically for you if you install this library.

Documention

The latest documentation is available here.

Changelog

v1.0.0 - 06/02/2020

Starting with version 1, flask-babel has changed to Semantic Versioning.

Changed

pytz is an explicit dependency. (#14)
pytz.gae, used for Google App Engine, is no longer necessary and has been removed. (#153)
Fixed a deprecated werkzeug import (#158).
Fix issues switching locales in threaded contexts (#125).

19 Open More issues

Closed

Support temporary language switch inside a request

It would be nice to be able to stash the current language somewhere and use another one for a while during a request execution.

The main use-case I see is sending out emails with Flask-Email. The email should be translated according to the recipient's language and not the current user's language.

Something like:

from flaskext.babel import stash, unstash

# do stuff with current user's language
print _('foo')
# Now switch to th recipient language
stash(new_lang=recipient.language)
send email with i18n tags
unstash()
# Now the language is back to the current user's lang

Well the API is terrible, but you get the idea..

opened Aug 26, 2010 by rslinckx 14

Closed

do not hardcode the translations folder path

This allows to specify in which folder the translations should be looked for instead of having it hardcoded (still defaults to "translations"). This is done either via a folder param passed to the constructor or via the BABEL_TRANSLATIONS_FOLDER configuration variable.

opened Feb 21, 2012 by mdeous 13

Closed

pybabel fails to update under python-3.3

TypeError is being thrown:

$ pybabel update -i messages.pot -d translations/
updating catalog 'translations/en/LC_MESSAGES/messages.po' based on 'messages.pot'
Traceback (most recent call last):
  File "/home/georg/env/main/bin/pybabel", line 9, in <module>
    load_entry_point('Babel==1.3', 'console_scripts', 'pybabel')()
  File "/home/georg/env/main/lib/python3.3/site-packages/babel/messages/frontend.py", line 1151, in main
    return CommandLineInterface().run(sys.argv)
  File "/home/georg/env/main/lib/python3.3/site-packages/babel/messages/frontend.py", line 665, in run
    return getattr(self, cmdname)(args[1:])
  File "/home/georg/env/main/lib/python3.3/site-packages/babel/messages/frontend.py", line 1130, in update
    width=options.width)
  File "/home/georg/env/main/lib/python3.3/site-packages/babel/messages/pofile.py", line 444, in write_po
    _write(comment_header + u'\n')
  File "/home/georg/env/main/lib/python3.3/site-packages/babel/messages/pofile.py", line 388, in _write
    fileobj.write(text)
TypeError: must be str, not bytes

opened Nov 23, 2013 by georgthegreat 12

Closed

Documentation request - using templates

There should be a short introduction in how to use gettext, trans etc in Jinja the jkji2 templates - it's not obvious from the docs that the jinja2 i18n ext is used and that the user does not need to configure this separately.

opened Aug 4, 2010 by danjac 9

Closed

Add basic support for locales unkown by Babel

Right now Flask breaks if you request content in a locale that is unknown by Babel even if the translation files actually exist.

This commit allows translations to be loaded even if the locale is unknown by Babel. Numbers and datetimes ~are returned directly~ use the default locale as a fallback.

opened Jul 24, 2017 by MarcAbonce 8

Closed

Bug application context since v0.10

I use flask_script (and flask_migrate) to migrate my sql schema. Since version 0.10 i got this error. Everything works well with 0.9

File "/usr/local/lib/python2.7/dist-packages/flask_babel/__init__.py", line 215, in get_translations
  babel = current_app.extensions['babel']
File "/usr/local/lib/python2.7/dist-packages/werkzeug/local.py", line 343, in __getattr__
  return getattr(self._get_current_object(), name)
File "/usr/local/lib/python2.7/dist-packages/werkzeug/local.py", line 302, in _get_current_object
  return self.__local()
File "/usr/local/lib/python2.7/dist-packages/flask/globals.py", line 34, in _find_app
  raise RuntimeError('working outside of application context')

opened May 8, 2016 by johaven 8

Open

Install `pgettext`, `npgettext` for Jinja templates

This makes these callables (instead of None in both cases) available for use as functions in Jinja templates using Flask's/Jinja's own hook.

I took the liberty to turn the first two positional arguments into keyword arguments to align with the rest of the arguments and make it easier to understand what they refer to.

I also renamed the argument x to s (for "string") as used in the implementation of Domain.gettext to align it with the other anonymous functions' arguments' names.

opened Jul 18, 2021 by homeworkprod 1

Open

Error when updating PO files: duplicated message definition, this is the location of the first definition

This happened to me, when updating already exiting PO files from POT, using pybabel update -i ./translations/messages.pot -d ./translations -l ca PoEdit is showing ...this is the location of the first definition error, and these are the real errors in those files:

msgfmt -v -c translations/ca/LC_MESSAGES/messages.po
translations/ca/LC_MESSAGES/messages.po:1887: duplicate message definition...
translations/ca/LC_MESSAGES/messages.po:7: ...this is the location of the first definition
translations/ca/LC_MESSAGES/messages.po:1929: duplicate message definition...
translations/ca/LC_MESSAGES/messages.po:777: ...this is the location of the first definition
translations/ca/LC_MESSAGES/messages.po:1962: duplicate message definition...
translations/ca/LC_MESSAGES/messages.po:545: ...this is the location of the first definition
translations/ca/LC_MESSAGES/messages.po:1980: duplicate message definition...
translations/ca/LC_MESSAGES/messages.po:26: ...this is the location of the first definition
translations/ca/LC_MESSAGES/messages.po:1983: duplicate message definition...
translations/ca/LC_MESSAGES/messages.po:49: ...this is the location of the first definition
translations/ca/LC_MESSAGES/messages.po:1986: duplicate message definition...
translations/ca/LC_MESSAGES/messages.po:54: ...this is the location of the first definition
translations/ca/LC_MESSAGES/messages.po:1989: duplicate message definition...
translations/ca/LC_MESSAGES/messages.po:59: ...this is the location of the first definition
translations/ca/LC_MESSAGES/messages.po:1992: duplicate message definition...
translations/ca/LC_MESSAGES/messages.po:64: ...this is the location of the first definition
translations/ca/LC_MESSAGES/messages.po:2025: duplicate message definition...
translations/ca/LC_MESSAGES/messages.po:486: ...this is the location of the first definition
translations/ca/LC_MESSAGES/messages.po:2028: duplicate message definition...
translations/ca/LC_MESSAGES/messages.po:491: ...this is the location of the first definition
translations/ca/LC_MESSAGES/messages.po:2031: duplicate message definition...
translations/ca/LC_MESSAGES/messages.po:501: ...this is the location of the first definition
translations/ca/LC_MESSAGES/messages.po:2034: duplicate message definition...
translations/ca/LC_MESSAGES/messages.po:202: ...this is the location of the first definition
translations/ca/LC_MESSAGES/messages.po:2037: duplicate message definition...
translations/ca/LC_MESSAGES/messages.po:207: ...this is the location of the first definition
translations/ca/LC_MESSAGES/messages.po:2040: duplicate message definition...
translations/ca/LC_MESSAGES/messages.po:289: ...this is the location of the first definition
translations/ca/LC_MESSAGES/messages.po:2043: duplicate message definition...
translations/ca/LC_MESSAGES/messages.po:241: ...this is the location of the first definition
translations/ca/LC_MESSAGES/messages.po:2046: duplicate message definition...
translations/ca/LC_MESSAGES/messages.po:251: ...this is the location of the first definition
translations/ca/LC_MESSAGES/messages.po:2052: duplicate message definition...
translations/ca/LC_MESSAGES/messages.po:279: ...this is the location of the first definition
msgfmt: found 17 fatal errors

Does not seem to be a problem with the POT, as newly created PO files from the template do not show this error. Anyway, you have it here: https://gitlab.com/liberaforms/liberaforms/-/blob/i18n/extracted-comments/liberaforms/translations/messages.pot

Why can this be happening, and how can it be solved?

opened Jun 17, 2021 by Porrumentzio 0

Open

Modifying translation files' structure

Seems that the unique way to structure translations with (flask-)babel is this:

/translations
|___messages.pot
|
|___/es
|...|___/LC_MESSAGES
|.......|____messages.po
|___/eu
|...|___/LC_MESSAGES
|.......|____messages.po

I want to use this kind of structure instead:

/translations
|___messages.pot
|___es.po
|___eu.po

Is this possible?

opened Jun 4, 2021 by Porrumentzio 0

Open

Extracting translator comments

I want to add translator comments on *.py files, using flask-babel module, and seems that the traditional Gettext extracted comment method* does not work, as there are no such comments on .pot.

* This structure:

# A comment
_("String to translate")

The documentation on Babel says:

Note:
Whether translator comments can be extracted depends on the extraction method in use. The Python extractor provided by Babel does implement this feature, but others may not.

So is this the case for Flask-Babel? Is there any workaround or method to extract these comments? Am I doing something wrong?

opened Jun 4, 2021 by Porrumentzio 1

Open

Translations not happening in production on Heroku/gunicorn

I have flask-babel running correctly on my development localhost (on Windows), but the translations do not happen on the production app (gunicorn on Heroku).

I've detailed the issue more fully in this unresolved StackOverflow post.

opened Apr 11, 2021 by robcowen 0

Open

Fix force locale in app context and multiple threads

Locale set by a force_locale context manager leaks between multiple threads when force_locale is used in application context rather than request context. This can be fixed by using flask.globals._app_ctx_stack as recommended by Flask documentation on extension development. Unlike current_app, the object on top of the _app_ctx_stack object is different in every application context so any attributes set to it do not change the same attributes in a different application context. This pull request is similar to #144, but it adds a test for the bug that the change fixes and moves tests related to force_locale to a new test module.

opened Feb 5, 2021 by lautat 0

v2.0.0(Aug 26, 2020)

Starting with version 2, flask-babel drops official support for Python2. Python versions 3.5 through 3.9-beta1 are tested and supported, as well as pypy3.

Tests moved from unittest to pytest (#163)
Domain and caching support from Flask-BabelEx (#163)
Documentation moved from python-hosted to Github Pages.
CI moved from Travisci to Github Actions
Small documentation improvements.
Removed uncessary checks on get_translations() (#127, #126)
localeselector and timezoneselector can be changed after creation.

Source code(tar.gz)
Source code(zip)

v1.0.0(Feb 6, 2020)

v1.0.0 - 06/02/2020

Starting with version 1, flask-babel has changed to Semantic Versioning.

Changed

pytz is an explicit dependency. (#14)
pytz.gae, used for Google App Engine, is no longer necessary and has been removed. (#153)
Fixed a deprecated werkzeug import (#158).
Fix issues switching locales in threaded contexts (#125).

Source code(tar.gz)
Source code(zip)

Information

Category: Python / Learning Tutorial
Watchers: 14
Star: 364
Fork: 146
Last update: Jul 29, 2021

Resource links

http://www.pythondoc.com/flask-babel/index.html

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

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