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Exception raised when pytz is passed an unknown timezone.

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    pytz releases.

    >>> isinstance(UnknownTimeZoneError(), KeyError)
    True

    And also a subclass of pytz.exceptions.Error, as are other pytz
    exceptions.

    >>> isinstance(UnknownTimeZoneError(), Error)
    True

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Exception raised when attempting to create an ambiguous wallclock time.

    At the end of a DST transition period, a particular wallclock time will
    occur twice (once before the clocks are set back, once after). Both
    possibilities may be correct, unless further information is supplied.

    See DstTzInfo.normalize() for more info
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