Python有有序集吗?

问题描述

Python 有一个有序字典.那么有序集合呢?

Python has an ordered dictionary. What about an ordered set?

推荐答案

有一个有序集(可能的新链接)配方这是从 Python 2 文档 中引用的.这可以在 Py2.6 或更高版本以及 3.0 或更高版本上运行，无需任何修改.接口几乎和普通集合一样，只是初始化应该用一个列表来完成.

There is an ordered set (possible new link) recipe for this which is referred to from the Python 2 Documentation. This runs on Py2.6 or later and 3.0 or later without any modifications. The interface is almost exactly the same as a normal set, except that initialisation should be done with a list.

OrderedSet([1, 2, 3])

这是一个 MutableSet，因此 .union 的签名与 set 的签名不匹配，但由于它包含 __or__，因此可以轻松添加类似的内容:

This is a MutableSet, so the signature for .union doesn't match that of set, but since it includes __or__ something similar can easily be added:

@staticmethod
def union(*sets):
    union = OrderedSet()
    union.union(*sets)
    return union

def union(self, *sets):
    for set in sets:
        self |= set

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