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Babel has a lazy proxy function under babel.support, that you can use when you need a lazy gettext string.
For example if you are defining field labels in a WTForms class:
from wtforms import Form, fields from myapp.utils import ugettext_lazy as _ class MyForm(Form): name = fields.TextField(_("Name"))
The string will be translated in the request thread rather than immediately, as in most cases you will want to provide the translation based on user settings (browser, session or database).
from flask import g from babel.support import LazyProxy def ugettext(s): # we assume a before_request function # assigns the correct user-specific # translations return g.translations.ugettext(s) ugettext_lazy = LazyProxy(ugettext)
This snippet by Dan Jacob can be used freely for anything you like. Consider it public domain.