django default language_code no prefix urls

noprefix_i18n.py

import re
import logging
from django.conf import settings
from django.urls import LocaleRegexURLResolver
from django.utils.translation import get_language

logger = logging.getLogger("django")


class NoPrefixLocaleRegexURLResolver(LocaleRegexURLResolver):

    @property
    def regex(self):
        language_code = get_language()

        if language_code not in self._regex_dict:
            regex_compiled = (re.compile('', re.UNICODE)
                              if language_code == settings.LANGUAGE_CODE
                              else re.compile('^%s/' % language_code, re.UNICODE))
            self._regex_dict[language_code] = regex_compiled
        return self._regex_dict[language_code]


def i18n_patterns(*urls, **kwargs):
    if not settings.USE_I18N:
        return list(urls)
    prefix_default_language = kwargs.pop('prefix_default_language', True)
    logger.info(prefix_default_language)
    assert not kwargs, 'Unexpected kwargs for i18n_patterns(): %s' % kwargs
    return [NoPrefixLocaleRegexURLResolver(list(urls), prefix_default_language=prefix_default_language)]