如何将短语列表转换为单词列表？

Question

I want to convert a list which contains both phrases and words to a list which contains only words. For example, if the input is:

list_of_phrases_and_words = ['I am', 'John', 'michael and', 'I am', '16', 
    'years', 'old']

The expected output is:

list_of_words = ['I', 'am', 'John', 'michael', 'and', 'I', 'am', '16', 'years', 'old']

What is the efficient way to achieve this is in Python?

Answer 1

You can use a list comprehension:

list_of_words = [
    word
    for phrase in list_of_phrases_and_words
    for word in phrase.split()
]

An alternative that might be slightly less efficient for larger lists would be to first create a large string containing everything and then splitting it:

list_of_words = " ".join(list_of_phrases_and_words).split()

Answer 2

诀窍是一个嵌套的 for 循环，您可以在空格字符“”上进行拆分。

words = [word for phrase in list_of_phrases_and_words for word in phrase.split(" ")]