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    >>> default_locale('LC_MESSAGES')
    'fr_FR'

    The "C" or "POSIX" pseudo-locales are treated as aliases for the
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    >>> default_locale('LC_MESSAGES')
    'en_US_POSIX'

    The following fallbacks to the variable are always considered:

    - ``LANGUAGE``
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    'de'

    Case is ignored by the algorithm, the result uses the case of the preferred
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    >>> negotiate_locale(['de_DE', 'en_US'], ['de_de', 'de_at'])
    'de_DE'

    >>> negotiate_locale(['de_DE', 'en_US'], ['de_de', 'de_at'])
    'de_DE'

    By default, some web browsers unfortunately do not include the territory
    in the locale identifier for many locales, and some don't even allow the
    user to easily add the territory. So while you may prefer using qualified
    locale identifiers in your web-application, they would not normally match
    the language-only locale sent by such browsers. To workaround that, this
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    >>> negotiate_locale(['ja', 'en_US'], ['ja_JP', 'en_US'])
    'ja_JP'

    Some browsers even use an incorrect or outdated language code, such as "no"
    for Norwegian, where the correct locale identifier would actually be "nb_NO"
    (Bokmål) or "nn_NO" (Nynorsk). The aliases are intended to take care of
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    >>> negotiate_locale(['no', 'sv'], ['nb_NO', 'sv_SE'])
    'nb_NO'

    You can override this default mapping by passing a different `aliases`
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    :param preferred: the list of locale strings preferred by the user
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    ('zh', 'CN', 'Hans', None)

    The default component separator is "_", but a different separator can be
    specified using the `sep` parameter:

    >>> parse_locale('zh-CN', sep='-')
    ('zh', 'CN', None, None)

    If the identifier cannot be parsed into a locale, a `ValueError` exception
    is raised:

    >>> parse_locale('not_a_LOCALE_String')
    Traceback (most recent call last):
      ...
    ValueError: 'not_a_LOCALE_String' is not a valid locale identifier

    Encoding information and locale modifiers are removed from the identifier:

    >>> parse_locale('it_IT@euro')
    ('it', 'IT', None, None)
    >>> parse_locale('en_US.UTF-8')
    ('en', 'US', None, None)
    >>> parse_locale('de_DE.iso885915@euro')
    ('de', 'DE', None, None)

    See :rfc:`4646` for more information.

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    >>> get_locale_identifier(('de', 'DE', None, '1999'))
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