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

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

(Source: http://code.djangoproject.com/ticket/5446 Also see: http://djangosnippets.org/snippets/494/)

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

python django internationalization
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