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        >>> la = timezone('America/Los_Angeles')
        >>> dt = la.localize(datetime(2011, 5, 7, 1, 2, 3))
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        >>> utc = timezone('UTC')
        >>> eastern = timezone('US/Eastern')
        >>> fmt = '%Y-%m-%d %H:%M:%S %Z (%z)'

        We next create a datetime right on an end-of-DST transition point,
        the instant when the wallclocks are wound back one hour.

        >>> utc_dt = datetime(2002, 10, 27, 6, 0, 0, tzinfo=utc)
        >>> loc_dt = utc_dt.astimezone(eastern)
        >>> loc_dt.strftime(fmt)
        '2002-10-27 01:00:00 EST (-0500)'

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        information has not changed.

        >>> before = loc_dt - timedelta(minutes=10)
        >>> before.strftime(fmt)
        '2002-10-27 00:50:00 EST (-0500)'

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        >>> before = eastern.normalize(before)
        >>> before.strftime(fmt)
        '2002-10-27 01:50:00 EDT (-0400)'

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        >>> th = timezone('Asia/Bangkok')
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        >>> fmt = '%Y-%m-%d %H:%M:%S %Z (%z)'
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        >>> from pytz import timezone
        >>> fmt = '%Y-%m-%d %H:%M:%S %Z (%z)'
        >>> amdam = timezone('Europe/Amsterdam')
        >>> dt  = datetime(2004, 10, 31, 2, 0, 0)
        >>> loc_dt1 = amdam.localize(dt, is_dst=True)
        >>> loc_dt2 = amdam.localize(dt, is_dst=False)
        >>> loc_dt1.strftime(fmt)
        '2004-10-31 02:00:00 CEST (+0200)'
        >>> loc_dt2.strftime(fmt)
        '2004-10-31 02:00:00 CET (+0100)'
        >>> str(loc_dt2 - loc_dt1)
        '1:00:00'

        Use is_dst=None to raise an AmbiguousTimeError for ambiguous
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        >>> try:
        ...     loc_dt1 = amdam.localize(dt, is_dst=None)
        ... except AmbiguousTimeError:
        ...     print('Ambiguous')
        Ambiguous

        is_dst defaults to False

        >>> amdam.localize(dt) == amdam.localize(dt, False)
        True

        is_dst is also used to determine the correct timezone in the
        wallclock times jumped over at the start of daylight saving time.

        >>> pacific = timezone('US/Pacific')
        >>> dt = datetime(2008, 3, 9, 2, 0, 0)
        >>> ploc_dt1 = pacific.localize(dt, is_dst=True)
        >>> ploc_dt2 = pacific.localize(dt, is_dst=False)
        >>> ploc_dt1.strftime(fmt)
        '2008-03-09 02:00:00 PDT (-0700)'
        >>> ploc_dt2.strftime(fmt)
        '2008-03-09 02:00:00 PST (-0800)'
        >>> str(ploc_dt2 - ploc_dt1)
        '1:00:00'

        Use is_dst=None to raise a NonExistentTimeError for these skipped
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        >>> tz.utcoffset(ambiguous, is_dst=False)
        datetime.timedelta(-1, 73800)

        >>> tz.utcoffset(ambiguous, is_dst=True)
        datetime.timedelta(-1, 77400)

        >>> try:
        ...     tz.utcoffset(ambiguous)
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        >>> normal = datetime(2009, 9, 1)

        >>> tz.dst(normal)
        datetime.timedelta(0, 3600)
        >>> tz.dst(normal, is_dst=False)
        datetime.timedelta(0, 3600)
        >>> tz.dst(normal, is_dst=True)
        datetime.timedelta(0, 3600)

        >>> ambiguous = datetime(2009, 10, 31, 23, 30)

        >>> tz.dst(ambiguous, is_dst=False)
        datetime.timedelta(0)
        >>> tz.dst(ambiguous, is_dst=True)
        datetime.timedelta(0, 3600)
        >>> try:
        ...     tz.dst(ambiguous)
        ... except AmbiguousTimeError:
        ...     print('Ambiguous')
        Ambiguous

        N(RRR)R4(RRR$((s</opt/alt/python27/lib/python2.7/site-packages/pytz/tzinfo.pyR'�
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        >>> tz.tzname(normal)
        'NDT'
        >>> tz.tzname(normal, is_dst=False)
        'NDT'
        >>> tz.tzname(normal, is_dst=True)
        'NDT'

        >>> ambiguous = datetime(2009, 10, 31, 23, 30)

        >>> tz.tzname(ambiguous, is_dst=False)
        'NST'
        >>> tz.tzname(ambiguous, is_dst=True)
        'NDT'
        >>> try:
        ...     tz.tzname(ambiguous)
        ... except AmbiguousTimeError:
        ...     print('Ambiguous')
        Ambiguous
        N(RRRR)R(RRR$((s</opt/alt/python27/lib/python2.7/site-packages/pytz/tzinfo.pyR(�
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