如何使用字典映射替换字符串中的单词 [英] How to replace words in a string using a dictionary mapping

问题描述

我有以下一句话

a = "you don't need a dog"

和一本字典

dict =  {"don't": "do not" }

但是我不能使用字典使用以下代码映射句子中的单词:

But I can't use the dictionary to map words in the sentence using the below code:

''.join(str(dict.get(word, word)) for word in a)

输出:

"you don't need a dog"

我在做什么错了?

推荐答案

这是一种方法.

a = "you don't need a dog"

d =  {"don't": "do not" }

res = ' '.join([d.get(i, i) for i in a.split()])

# 'you do not need a dog'

说明

• 切勿在类后命名变量，例如使用d代替dict.
• 使用str.split可以按空格分隔.
• 无需将str换成已经是字符串的值.
• str.join与列表生成器相比，与生成器表达式相比，略胜一筹.

• Never name a variable after a class, e.g. use d instead of dict.
• Use str.split to split by whitespace.
• There is no need to wrap str around values which are already strings.
• str.join works marginally better with a list comprehension versus a generator expression.

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