为什么 split() 结果中返回空字符串? [英] Why are empty strings returned in split() results?

问题描述

'/segment/segment/'.split('/') 返回 ['', 'segment', 'segment', ''] 的意义是什么?

注意空元素.如果您在一个恰好位于字符串末尾的分隔符上进行拆分，那么从每一端返回空字符串会给您带来什么额外的值?

Notice the empty elements. If you're splitting on a delimiter that happens to be at position one and at the very end of a string, what extra value does it give you to have the empty string returned from each end?

推荐答案

str.split 补充 str.join，所以

"/".join(['', 'segment', 'segment', ''])

让您返回原始字符串.

如果不存在空字符串，则 join() 之后的第一个和最后一个 '/' 将丢失.

If the empty strings were not there, the first and last '/' would be missing after the join().

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