替换作为给定的字符串值的字典字符串和替换项。Python

Question

我有一个字典，其中的字符串将被替换为keys，它的替换为值。除了逐个查看字符串标记外，是否有更好/更快的方法进行替换？在

我一直是这样做的：

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])

Answer 1

re.sub可以调用返回替换的函数

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

import re

def fn(match):
    return segmenter[match.group()]

print re.sub('|'.join(re.escape(k) for k in segmenter), fn, sentence)