python - 如何在 Python 中设置一个变量大于另一个变量？

Question

我正在尝试用 Python 制作一个“石头剪刀布”游戏，我想将一个变量设置为大于另一个变量。

类似于:

paper > rock
scissors > paper
rock > scissors

我该怎么做...？

Answer 1

是的，正如丹尼尔所说，通过覆盖 __cmp__ 你可以实现这个:

class Comparable(object):
    def __init__(self, below_class, above_class):
        self.above_class = above_class
        self.below_class = below_class

    def __cmp__(self, other):
        if isinstance(other, self.below_class):
            return 1
        if isinstance(other, self.above_class):
            return -1
        return 0

class Paper(Comparable):
    pass

class Rock(Comparable):
    pass

class Scissors(Comparable):
    pass

scissors = Scissors(Paper, Rock)
paper = Paper(Rock, Scissors)
rock = Rock(Scissors, Paper)

# True

print paper > rock
print scissors > paper
print rock > scissors

# False

print paper < rock
print scissors < paper
print rock < scissors

有关此工作方式的文档可在此处获得:https://docs.python.org/2.6/reference/datamodel.html#object.cmp