将字符串替换为字符串替换为键和替换为值替换子字符串。蟒蛇 [英] Replacing substrings given a dictionary of strings-to-be-replaced as keys and replacements as values. Python

问题描述

我有一个字典，其中字符串要替换为键，其替换为值。除了通过令牌查看字符串令牌之外，是否有更好/更快的方式进行替换？

I have a dictionary with the strings to be replaced as keys and its replacement as values. Other than looking through the strings token by token, is there a better/faster way of doing the replacement?

我一直这样做：

segmenter = {'foobar':'foo bar', 'withoutspace':'without space', 'barbar': 'bar bar'}

sentence = "this is a foobar in a barbar withoutspace"

for i in sentence.split():
  if i in segmenter:
    sentence.replace(i, segmenter[i])

推荐答案

字符串在python中是不可变的。所以， str.replace 返回一个新的字符串，而不是修改原来的字符串。您可以在这里使用 str.join（）和列表理解：

String are immutable in python. So, str.replace returns a new string instead of modifying the original string. You can use str.join() and list comprehension here:

>>> segmenter = {'foobar':'foo bar', 'withoutspace':'without space', 'barbar': 'bar bar'}
>>> sentence = "this is a foobar in a barbar withoutspace"

>>> " ".join( [ segmenter.get(word,word) for word in sentence.split()] )
'this is a foo bar in a bar bar without space'

str.replace 的另一个问题是它也会替换abarbarb与

Another problem with str.replace is that it'll also replace words like "abarbarb" with

abar barb。

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