本文介绍了在字符串中查找单词的位置的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！
问题描述
与:
sentence= input("Enter a sentence")
keyword= input("Input a keyword from the sentence")
我想找到关键字在句子中的位置.到目前为止，我的代码去掉了标点符号并将所有字母变为小写:
I want to find the position of the keyword in the sentence. So far, I have this code which gets rid of the punctuation and makes all letters lowercase:
punctuations = '''!()-[]{};:'",<>./?@#$%^&*_~'''#This code defines punctuation
#This code removes the punctuation
no_punct = ""
for char in sentence:
if char not in punctuations:
no_punct = no_punct + char
no_punct1 =(str.lower (no_punct)
我知道需要一段代码来实际找到单词的位置.
I know need a piece of code which actually finds the position of the word.
推荐答案
这就是 str.find() 用于:
This is what str.find() is for :
sentence.find(word)
这将为您提供单词的起始位置(如果存在，否则为-1)，然后您只需将单词的长度添加到它以获得其结尾的索引.
This will give you the start position of the word (if it exists, otherwise -1), then you can just add the length of the word to it in order to get the index of its end.
start_index = sentence.find(word)
end_index = start_index + len(word) # if the start_index is not -1
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