在python中切换字典中的键和值

问题描述：

假设我有一本这样的字典:

Say I have a dictionary like so:

my_dict = {2:3, 5:6, 8:9}

有没有办法可以切换键和值来获取:

Is there a way that I can switch the keys and values to get:

{3:2, 6:5, 9:8}

答

my_dict2 = dict((y,x) for x,y in my_dict.iteritems())

如果您使用的是 python 2.7 或 3.x，您可以改用字典理解:

If you are using python 2.7 or 3.x you can use a dictionary comprehension instead:

my_dict2 = {y:x for x,y in my_dict.iteritems()}

编辑

如 JBernardo 的评论中所述，对于 python 3.x，您需要使用 items 而不是 iteritems

As noted in the comments by JBernardo, for python 3.x you need to use items instead of iteritems