26 lines
486 B
Python
26 lines
486 B
Python
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from enum import Enum
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from typing import override
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class Tern(Enum):
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N = -1
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U = 0
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Y = 1
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@override
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def __str__(self):
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if self.value == -1:
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return "0"
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if self.value == 1:
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return "1"
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return "N"
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@classmethod
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def from_string(cls, s: str) -> "Tern":
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if s == "N":
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return Tern.U
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if s == "0":
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return Tern.N
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if s == "1":
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return Tern.Y
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return cls[s]
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