web.py 0.3 新手指南 - 实时语言切换

问题:

解法:

import os
import sys
import gettext
import web

# File location directory.
rootdir = os.path.abspath(os.path.dirname(__file__))

# i18n directory.
localedir = rootdir + '/i18n'

# Object used to store all translations.
allTranslations = web.storage()

def get_translations(lang='en_US'):
# Init translation.
if allTranslations.has_key(lang):
translation = allTranslations[lang]
elif lang is None:
translation = gettext.NullTranslations()
else:
try:
translation = gettext.translation(
'messages',
localedir,
languages=[lang],
)
except IOError:
translation = gettext.NullTranslations()
return translation

def load_translations(lang):
"""Return the translations for the locale."""
lang = str(lang)
translation  = allTranslations.get(lang)
if translation is None:
translation = get_translations(lang)
allTranslations[lang] = translation

# Delete unused translations.
for lk in allTranslations.keys():
if lk != lang:
del allTranslations[lk]
return translation

def custom_gettext(string):
"""Translate a given string to the language of the application."""
translation = load_translations(session.get('lang'))
if translation is None:
return unicode(string)
return translation.ugettext(string)

urls = (
'/', 'index'
)

render = web.template.render('templates/',
globals={
'_': custom_gettext,
}
)

app = web.application(urls, globals())

# Init session.
session = web.session.Session(app,
web.session.DiskStore('sessions'),
initializer={
'lang': 'en_US',
}
)

class index:
def GET(self):
i = web.input()
lang = i.get('lang', 'en_US')

# Debug.
print >> sys.stderr, 'Language:', lang

session['lang'] = lang
return render.index()

if __name__ == "__main__": app.run()

$_('Hello')

$ python code.py http://0.0.0.0:8080/[/code] 然后用你喜欢的浏览器访问下面的地址，检查语言是否改变:

http://your_server:8080/ http://your_server:8080/?lang=en_US http://your_server:8080/?lang=zh_CN

你必须:

确保语言文件(en_US、zh_CN等)可以动态改变。

确保custom_gettext()调用越省资源约好。

参考:

这里有使用app.app_processor()的 另一个方案。