用于定义选择字段的元组列表中前导下划线的含义?

Meaning of leading underscore in list of tuples used to define choice fields?(用于定义选择字段的元组列表中前导下划线的含义?)

问题描述

我见过一些这样定义选择字段的示例:

I've seen a few examples defining choice fields like so:

COUNTRIES = (
    ('fr', _('France')),
    ('de', _('Germany')),
    ...
)

(来源:http://code.djangoproject.com/ticket/5446另请参阅:http://djangosnippets.org/snippets/494/)

前导下划线是什么意思?为什么元组中的第二个值还要加上括号?

What is the meaning of the leading underscores? And why is the second value in the tuple even parenthesized?

推荐答案

前导下划线是国际化 (i18n) 机制使用的 ugettext 函数之一的常用函数别名.

The leading underscore is the commonly used function alias for the one of the ugettext functions used by the internationalization (i18n) mechanics.

这意味着当您运行 i18n 时，选择字段标签将被翻译成适当的最终用户语言(如果有翻译可用).

It means that when you have i18n running, the choicefield labels will be translated into the appropriate end-user language, if a translation is available.

在具有这种语法的文件的顶部，您应该看到(或者如果没有，您应该看到)如下内容:

At the top of a file that features this kind of syntax, you should see (or if not, you should have) something like:

from django.utils.translation import ugettext_lazy as _

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