python - 在 Python 中引用另一个枚举作为枚举值？

Question

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Answer 1

如果您不介意稍微重新排序您的枚举，这很容易:

class Directions(Enum):
    #
    NORTH = 1, 0
    EAST = 0, 1
    SOUTH = -1, 0
    WEST = 0, -1
    #
    def __init__(self, x, y):
        self.x = x
        self.y = y
        if len(self.__class__):
            # make links
            all = list(self.__class__)
            left, right = all[0], all[-1]
            self.left = left
            self.right = right
            left.right = self
            right.left = self

并在使用中:

>>> Directions.NORTH
<Directions.NORTH: (1, 0)>

>>> Directions.NORTH.left
<Directions.EAST: (0, 1)>

>>> Directions.NORTH.right
<Directions.WEST: (0, -1)>

>>> Directions.WEST.left
<Directions.NORTH: (1, 0)>

>>> Directions.WEST.right
<Directions.SOUTH: (-1, 0)>

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披露:我是 Python stdlib Enum 的作者, enum34 backport , 和 Advanced Enumeration (aenum)图书馆。