python - 在字符串中查找特定单词，Python

Question

创建一个函数，给定两个参数:作为字符串的文本和作为一组字符串的单词，返回字符串中包含的单词数。

例如。 count_words("How aresjfhdskfhskd you?", {"how", "are", "you", "hello"}) == 3

我的尝试:

import re
def count_words(text, words):
count = 0
for i in words:
    x = re.compile('.*'+i+'.*')
    if x.search(text):
        count +=1
return count

我想这个问题之前已经回答过好几次了，但我就是找不到相关的答案，所以我很抱歉。任何帮助将不胜感激，谢谢

Answer 1

def count_words(text, words):
    answer = 0
    for i in range(len(text)):
        if any(text[i:].startswith(word) for word in words):
            answer += 1
    return answer

如果您希望它对文本中的字母大小写不敏感:

def count_words(text, words):
    text = text.lower()
    answer = 0
    for i in range(len(text)):
        if any(text[i:].startswith(word) for word in words):
            answer += 1
    return answer

当然，这可以用一行代码完成:

sum(text.count(word) for word in words)