def get_timezone_name(dt_or_tzinfo=None, width='long', uncommon=False,
                      locale=LC_TIME, zone_variant=None):
    r"""Return the localized display name for the given timezone. The timezone
    may be specified using a ``datetime`` or `tzinfo` object.

    >>> dt = time(15, 30, tzinfo=get_timezone('America/Los_Angeles'))
    >>> get_timezone_name(dt, locale='en_US')
    u'Pacific Standard Time'
    >>> get_timezone_name(dt, width='short', locale='en_US')
    u'PST'

    If this function gets passed only a `tzinfo` object and no concrete
    `datetime`,  the returned display name is indenpendent of daylight savings
    time. This can be used for example for selecting timezones, or to set the
    time of events that recur across DST changes:

    >>> tz = get_timezone('America/Los_Angeles')
    >>> get_timezone_name(tz, locale='en_US')
    u'Pacific Time'
    >>> get_timezone_name(tz, 'short', locale='en_US')
    u'PT'

    If no localized display name for the timezone is available, and the timezone
    is associated with a country that uses only a single timezone, the name of
    that country is returned, formatted according to the locale:

    >>> tz = get_timezone('Europe/Berlin')
    >>> get_timezone_name(tz, locale='de_DE')
    u'Mitteleurop\xe4ische Zeit'
    >>> get_timezone_name(tz, locale='pt_BR')
    u'Hor\xe1rio da Europa Central'

    On the other hand, if the country uses multiple timezones, the city is also
    included in the representation:

    >>> tz = get_timezone('America/St_Johns')
    >>> get_timezone_name(tz, locale='de_DE')
    u'Neufundland-Zeit'

    Note that short format is currently not supported for all timezones and
    all locales.  This is partially because not every timezone has a short
    code in every locale.  In that case it currently falls back to the long
    format.

    For more information see `LDML Appendix J: Time Zone Display Names
    <http://www.unicode.org/reports/tr35/#Time_Zone_Fallback>`_

    .. versionadded:: 0.9

    .. versionchanged:: 1.0
       Added `zone_variant` support.

    :param dt_or_tzinfo: the ``datetime`` or ``tzinfo`` object that determines
                         the timezone; if a ``tzinfo`` object is used, the
                         resulting display name will be generic, i.e.
                         independent of daylight savings time; if `None`, the
                         current date in UTC is assumed
    :param width: either "long" or "short"
    :param uncommon: deprecated and ignored
    :param zone_variant: defines the zone variation to return.  By default the
                           variation is defined from the datetime object
                           passed in.  If no datetime object is passed in, the
                           ``'generic'`` variation is assumed.  The following
                           values are valid: ``'generic'``, ``'daylight'`` and
                           ``'standard'``.
    :param locale: the `Locale` object, or a locale string
    """
    if dt_or_tzinfo is None:
        dt = datetime.now()
        tzinfo = LOCALTZ
    elif isinstance(dt_or_tzinfo, string_types):
        dt = None
        tzinfo = get_timezone(dt_or_tzinfo)
    elif isinstance(dt_or_tzinfo, integer_types):
        dt = None
        tzinfo = UTC
    elif isinstance(dt_or_tzinfo, (datetime, time)):
        dt = dt_or_tzinfo
        if dt.tzinfo is not None:
            tzinfo = dt.tzinfo
        else:
            tzinfo = UTC
    else:
        dt = None
        tzinfo = dt_or_tzinfo
    locale = Locale.parse(locale)

    if hasattr(tzinfo, 'zone'):
        zone = tzinfo.zone
    else:
        zone = tzinfo.tzname(dt)

    if zone_variant is None:
        if dt is None:
            zone_variant = 'generic'
        else:
            dst = tzinfo.dst(dt)
            if dst:
                zone_variant = 'daylight'
            else:
                zone_variant = 'standard'
    else:
        if zone_variant not in ('generic', 'standard', 'daylight'):
            raise ValueError('Invalid zone variation')

    # Get the canonical time-zone code
    zone = get_global('zone_aliases').get(zone, zone)

    info = locale.time_zones.get(zone, {})
    # Try explicitly translated zone names first
    if width in info:
        if zone_variant in info[width]:
            return info[width][zone_variant]

    metazone = get_global('meta_zones').get(zone)
    if metazone:
        metazone_info = locale.meta_zones.get(metazone, {})
        if width in metazone_info:
            if zone_variant in metazone_info[width]:
                return metazone_info[width][zone_variant]

    # If we have a concrete datetime, we assume that the result can't be
    # independent of daylight savings time, so we return the GMT offset
    if dt is not None:
        return get_timezone_gmt(dt, width=width, locale=locale)

    return get_timezone_location(dt_or_tzinfo, locale=locale)
dataset/ETHPy150Open maraoz/proofofexistence/babel/dates.py/get_timezone_name/original