Python: Best Way to Exchange Keys with Values in a Dictionary?

最新推荐文章于 2021-04-23 16:01:20 发布

mlzboy

最新推荐文章于 2021-04-23 16:01:20 发布

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文章标签： Exchange Python

本文介绍了一种使用Python交换字典中键和值的方法。通过字典推导式的简洁表达，可以轻松实现键值对的反转。例如，给定字典a={(1,2),(2,3)}

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http://stackoverflow.com/questions/1031851/python-best-way-to-exchange-keys-with-values-in-a-dictionary

answer is:

<code><span class="pln">res </span><span class="pun">=</span><span class="pln"> dict</span><span class="pun">((</span><span class="pln">v</span><span class="pun">,</span><span class="pln">k</span><span class="pun">)</span><span class="pln"> </span><span class="kwd">for</span><span class="pln"> k</span><span class="pun">,</span><span class="pln">v </span><span class="kwd">in</span><span class="pln"> a</span><span class="pun">.</span><span class="pln">iteritems</span><span class="pun">())</span><span class="pln">
</span></code>

a=dict([(1,2),(2,3)])