从字典中删除带有空字符串的键的有效方法 [英] Efficient way to remove keys with empty strings from a dict

问题描述

我有一个字典，想删除所有有空值字符串的键.

I have a dict and would like to remove all the keys for which there are empty value strings.

metadata = {u'Composite:PreviewImage': u'(Binary data 101973 bytes)',
            u'EXIF:CFAPattern2': u''}

最好的方法是什么?

推荐答案

Python 2.X

dict((k, v) for k, v in metadata.iteritems() if v)

<小时>

Python 2.7 - 3.X

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Python 2.7 - 3.X

{k: v for k, v in metadata.items() if v}

请注意，您的所有键都有值.只是其中一些值是空字符串.字典中没有没有值的键；如果它没有值，它就不会出现在字典中.

Note that all of your keys have values. It's just that some of those values are the empty string. There's no such thing as a key in a dict without a value; if it didn't have a value, it wouldn't be in the dict.

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