cache.py 文件源码

def _i18n_cache_key_suffix(request, cache_key):
    """If necessary, adds the current locale or time zone to the cache key."""
    if settings.USE_I18N or settings.USE_L10N:
        # first check if LocaleMiddleware or another middleware added
        # LANGUAGE_CODE to request, then fall back to the active language
        # which in turn can also fall back to settings.LANGUAGE_CODE
        cache_key += '.%s' % getattr(request, 'LANGUAGE_CODE', get_language())
    if settings.USE_TZ:
        # The datetime module doesn't restrict the output of tzname().
        # Windows is known to use non-standard, locale-dependent names.
        # User-defined tzinfo classes may return absolutely anything.
        # Hence this paranoid conversion to create a valid cache key.
        tz_name = force_text(get_current_timezone_name(), errors='ignore')
        cache_key += '.%s' % tz_name.encode('ascii', 'ignore').decode('ascii').replace(' ', '_')
    return cache_key