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60 lines
1.5 KiB
60 lines
1.5 KiB
4 years ago
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'''
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Custom exceptions raised by pytz.
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'''
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__all__ = [
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'UnknownTimeZoneError', 'InvalidTimeError', 'AmbiguousTimeError',
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'NonExistentTimeError',
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]
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class Error(Exception):
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'''Base class for all exceptions raised by the pytz library'''
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class UnknownTimeZoneError(KeyError, Error):
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'''Exception raised when pytz is passed an unknown timezone.
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>>> isinstance(UnknownTimeZoneError(), LookupError)
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True
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This class is actually a subclass of KeyError to provide backwards
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compatibility with code relying on the undocumented behavior of earlier
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pytz releases.
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>>> isinstance(UnknownTimeZoneError(), KeyError)
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True
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And also a subclass of pytz.exceptions.Error, as are other pytz
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exceptions.
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>>> isinstance(UnknownTimeZoneError(), Error)
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True
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'''
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pass
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class InvalidTimeError(Error):
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'''Base class for invalid time exceptions.'''
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class AmbiguousTimeError(InvalidTimeError):
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'''Exception raised when attempting to create an ambiguous wallclock time.
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At the end of a DST transition period, a particular wallclock time will
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occur twice (once before the clocks are set back, once after). Both
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possibilities may be correct, unless further information is supplied.
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See DstTzInfo.normalize() for more info
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'''
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class NonExistentTimeError(InvalidTimeError):
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'''Exception raised when attempting to create a wallclock time that
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cannot exist.
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At the start of a DST transition period, the wallclock time jumps forward.
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The instants jumped over never occur.
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'''
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