在Python中使用None值删除字典中键的正确方法 [英] Proper way to remove keys in dictionary with None values in Python

问题描述

在Python中从值== None的字典中删除键的正确方法是什么?

What is the proper way to remove keys from a dictionary with value == None in Python?

推荐答案

通常，您将创建一个新的dict，它是通过过滤旧的dict构造的.字典理解对于这种事情很有用:

Generally, you'll create a new dict constructed from filtering the old one. dictionary comprehensions are great for this sort of thing:

{k: v for k, v in original.items() if v is not None}

如果您必须更新原始字典，则可以这样做...

If you must update the original dict, you can do it like this ...

filtered = {k: v for k, v in original.items() if v is not None}
original.clear()
original.update(filtered)

这可能是我可以想到的就地删除它们的最干净"的方式(在遍历字典时修改字典是不安全的)

This is probably the most "clean" way to remove them in-place that I can think of (it isn't safe to modify a dict while you're iterating over it)

^{在python2.x上使用original.iteritems()}

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