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1 '''
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2 Custom exceptions raised by pytz.
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3 '''
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4
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5 __all__ = [
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6 'UnknownTimeZoneError', 'InvalidTimeError', 'AmbiguousTimeError',
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7 'NonExistentTimeError',
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8 ]
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9
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10
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11 class Error(Exception):
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12 '''Base class for all exceptions raised by the pytz library'''
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13
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14
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15 class UnknownTimeZoneError(KeyError, Error):
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16 '''Exception raised when pytz is passed an unknown timezone.
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17
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18 >>> isinstance(UnknownTimeZoneError(), LookupError)
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19 True
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20
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21 This class is actually a subclass of KeyError to provide backwards
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22 compatibility with code relying on the undocumented behavior of earlier
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23 pytz releases.
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24
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25 >>> isinstance(UnknownTimeZoneError(), KeyError)
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26 True
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27
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28 And also a subclass of pytz.exceptions.Error, as are other pytz
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29 exceptions.
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30
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31 >>> isinstance(UnknownTimeZoneError(), Error)
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32 True
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33
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34 '''
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35 pass
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36
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37
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38 class InvalidTimeError(Error):
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39 '''Base class for invalid time exceptions.'''
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40
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41
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42 class AmbiguousTimeError(InvalidTimeError):
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43 '''Exception raised when attempting to create an ambiguous wallclock time.
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44
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45 At the end of a DST transition period, a particular wallclock time will
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46 occur twice (once before the clocks are set back, once after). Both
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47 possibilities may be correct, unless further information is supplied.
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48
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49 See DstTzInfo.normalize() for more info
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50 '''
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51
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52
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53 class NonExistentTimeError(InvalidTimeError):
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54 '''Exception raised when attempting to create a wallclock time that
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55 cannot exist.
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56
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57 At the start of a DST transition period, the wallclock time jumps forward.
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58 The instants jumped over never occur.
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59 '''
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