Flask大型教程:国际化和本地化

from flask.ext.babel import Babel
babel = Babel(app)

# -*- coding: utf-8 -*-
# ...
# available languages
LANGUAGES = {
    'en': 'English',
    'es': 'Español'
}

from app import babel
from config import LANGUAGES

@babel.localeselector
def get_locale():
    return request.accept_languages.best_match(LANGUAGES.keys())

Accept-Language: da, en-gb;q=0.8, en;q=0.7

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

if resp.email is None or resp.email == "":
    flash('Invalid login. Please try again.')
    redirect(url_for('login'))

from flask.ext.babel import gettext
# ...
if resp.email is None or resp.email == "":
    flash(gettext('Invalid login. Please try again.'))
    redirect(url_for('login'))

<li><a href="{{ url_for('index') }}">Home</a></li>

<li><a href="{{ url_for('index') }}">{{ _('Home') }}</a></li>

<p><a href="{{url_for('user', nickname = post.author.nickname)}}">{{post.author.nickname}}</a> said {{momentjs(post.timestamp).fromNow()}}:</p>

gettext('Hello, %(name)s', name = user.nickname)

{% autoescape false %}
<p>{{ _('%(nickname)s said %(when)s:', nickname = '<a href="%s">%s</a>' % (url_for('user', nickname = post.author.nickname), post.author.nickname), when = momentjs(post.timestamp).fromNow()) }}</p>
{% endautoescape %}

import re

class User(db.Model):
    #...
    @staticmethod
    def make_valid_nickname(nickname):
        return re.sub('[^a-zA-Z0-9_\.]', '', nickname)

@oid.after_login
def after_login(resp):
    #...
    nickname = User.make_valid_nickname(nickname)
    nickname = User.make_unique_nickname(nickname)
    user = User(nickname = nickname, email = resp.email, role = ROLE_USER)
    #...

class EditForm(Form):
    #...
    def validate(self):
        if not Form.validate(self):
            return False
        if self.nickname.data == self.original_nickname:
            return True
        if self.nickname.data != User.make_valid_nickname(self.nickname.data):
            self.nickname.errors.append(gettext('This nickname has invalid characters. Please use letters, numbers, dots and underscores only.'))
            return False
        user = User.query.filter_by(nickname=self.nickname.data).first()
        if user is not None:
            self.nickname.errors.append(gettext('This nickname is already in use. Please choose another one.'))
            return False
        return True

flask/bin/pybabel extract -F babel.cfg -o messages.pot app

flask\Scripts\pybabel extract -F babel.cfg -o messages.pot app

flask/bin/pybabel init -i messages.pot -d app/translations -l es

flask/bin/pybabel compile -d app/translations

@babel.localeselector
def get_locale():
    return "es" #request.accept_languages.best_match(LANGUAGES.keys())

flask/bin/pybabel extract -F babel.cfg -o messages.pot app
flask/bin/pybabel update -i messages.pot -d app/translations

@app.before_request
def before_request():
    g.user = current_user
    if g.user.is_authenticated():
        g.user.last_seen = datetime.utcnow()
        db.session.add(g.user)
        db.session.commit()
        g.search_form = SearchForm()
    g.locale = get_locale()

{% if g.locale != 'en' %}
<script src="/static/js/moment-{{g.locale}}.min.js"></script>
{% endif %}

from flask.ext.babel import gettext
lm.login_message = gettext('Please log in to access this page.')

from flask.ext.babel import lazy_gettext
lm.login_message = lazy_gettext('Please log in to access this page.')

flask/bin/pybabel extract -F babel.cfg -k lazy_gettext -o messages.pot app

from flask.json import JSONEncoder

class CustomJSONEncoder(JSONEncoder):
    """This class adds support for lazy translation texts to Flask's
    JSON encoder. This is necessary when flashing translated texts."""
    def default(self, obj):
        from speaklater import is_lazy_string
        if is_lazy_string(obj):
            try:
                return unicode(obj)  # python 2
            except NameError:
                return str(obj)  # python 3
        return super(CustomJSONEncoder, self).default(obj)

app.json_encoder = CustomJSONEncoder

#!flask/bin/python
import os
import sys
if sys.platform == 'wn32':
    pybabel = 'flask\\Scripts\\pybabel'
else:
    pybabel = 'flask/bin/pybabel'
if len(sys.argv) != 2:
    print "usage: tr_init <language-code>"
    sys.exit(1)
os.system(pybabel + ' extract -F babel.cfg -k lazy_gettext -o messages.pot app')
os.system(pybabel + ' init -i messages.pot -d app/translations -l ' + sys.argv[1])
os.unlink('messages.pot')

#!flask/bin/python
import os
import sys
if sys.platform == 'wn32':
    pybabel = 'flask\\Scripts\\pybabel'
else:
    pybabel = 'flask/bin/pybabel'
os.system(pybabel + ' extract -F babel.cfg -k lazy_gettext -o messages.pot app')
os.system(pybabel + ' update -i messages.pot -d app/translations')
os.unlink('messages.pot')

#!flask/bin/python
import os
import sys
if sys.platform == 'wn32':
    pybabel = 'flask\\Scripts\\pybabel'
else:
    pybabel = 'flask/bin/pybabel'
os.system(pybabel + ' compile -d app/translations')