如何从列表中提取一系列连续的预先指定的单词？

Question

我有两个列表：

list_1是我感兴趣的单词列表
list_2是从文本中提取的词的标记化序列

我想要做的是从list_2中提取单词序列（如果它们包含在list_1中），并将它们连接起来，只要list_2中的以下单词也包含在list_1中。

不幸的是，我不知道如何开始。 任何小费将不胜感激。

此致！

Answer 1

你不妨试试：

text = ("What I want to do is to extract sequences of words out of list_2 " 
        "if they are contained in list_1 and concatenate them as long as the "
        "following word in list_2 is also contained in list_1. Is to")

list1 = ["is", "to", "do"]
list2 = text.lower().split(" ")

def extract(list2, list1):
    res = []
    string = ""
    for word in list2:
        if word in list1:
            string += " " + word
        elif string:
            res.append(string.strip())
            string = ""
    res.append(string.strip())
    return res

extract(list2, list1)

---

['to do is to', 'is', 'is to']