我正在尝试打印给定文本中的短语。我希望能够打印文本中的每个短语，从 2 个单词到文本长度允许的最大单词数。我在下面编写了一个程序，它打印所有长度最多为 5 个单词的短语，但我无法找到更优雅的方法来让它打印所有可能的短语。

我对 phrase 的定义 = 字符串中的连续单词，不管是什么意思。

def phrase_builder(i):
    phrase_length = 4
    phrase_list = []
    for x in range(0, len(i)-phrase_length):
        phrase_list.append(str(i[x]) + " " + str(i[x+1]))
        phrase_list.append(str(i[x]) + " " + str(i[x+1]) + " " + str(i[x+2]))
        phrase_list.append(str(i[x]) + " " + str(i[x+1]) + " " + str(i[x+2]) + " " + str(i[x+3]))
        phrase_list.append(str(i[x]) + " " + str(i[x+1]) + " " + str(i[x+2]) + " " + str(i[x+3]) + " " + str(i[x+4]))
    return phrase_list

text = "the big fat cat sits on the mat eating a rat"

print phrase_builder(text.split())

这个的输出是:

['the big', 'the big fat', 'the big fat cat', 'the big fat cat sits',
'big fat', 'big fat cat', 'big fat cat sits', 'big fat cat sits on',
'fat cat', 'fat cat sits', 'fat cat sits on', 'fat cat sits on the',
'cat sits', 'cat sits on', 'cat sits on the', 'cat sits on the mat',
'sits on', 'sits on the', 'sits on the mat', 'sits on the mat eating',
'on the', 'on the mat', 'on the mat eating', 'on the mat eating a',
'the mat', 'the mat eating', 'the mat eating a', 'the mat eating a rat']

我希望能够打印诸如“the big fat cat sits on the mat eating”和“fat cat sits on the mat eating a rat”这样的短语等等

有人可以提供一些建议吗？

最佳答案

只需使用 itertools.combinations

from itertools import combinations
text = "the big fat cat sits on the mat eating a rat"
lst = text.split()
for start, end in combinations(range(len(lst)), 2):
    print lst[start:end+1]

输出:

['the', 'big']
['the', 'big', 'fat']
['the', 'big', 'fat', 'cat']
['the', 'big', 'fat', 'cat', 'sits']
['the', 'big', 'fat', 'cat', 'sits', 'on']
['the', 'big', 'fat', 'cat', 'sits', 'on', 'the']
['the', 'big', 'fat', 'cat', 'sits', 'on', 'the', 'mat']
['the', 'big', 'fat', 'cat', 'sits', 'on', 'the', 'mat', 'eating']
['the', 'big', 'fat', 'cat', 'sits', 'on', 'the', 'mat', 'eating', 'a']
['the', 'big', 'fat', 'cat', 'sits', 'on', 'the', 'mat', 'eating', 'a', 'rat']
['big', 'fat']
['big', 'fat', 'cat']
['big', 'fat', 'cat', 'sits']
['big', 'fat', 'cat', 'sits', 'on']
['big', 'fat', 'cat', 'sits', 'on', 'the']
['big', 'fat', 'cat', 'sits', 'on', 'the', 'mat']
['big', 'fat', 'cat', 'sits', 'on', 'the', 'mat', 'eating']
['big', 'fat', 'cat', 'sits', 'on', 'the', 'mat', 'eating', 'a']
['big', 'fat', 'cat', 'sits', 'on', 'the', 'mat', 'eating', 'a', 'rat']
['fat', 'cat']
['fat', 'cat', 'sits']
['fat', 'cat', 'sits', 'on']
['fat', 'cat', 'sits', 'on', 'the']
['fat', 'cat', 'sits', 'on', 'the', 'mat']
['fat', 'cat', 'sits', 'on', 'the', 'mat', 'eating']
['fat', 'cat', 'sits', 'on', 'the', 'mat', 'eating', 'a']
['fat', 'cat', 'sits', 'on', 'the', 'mat', 'eating', 'a', 'rat']
['cat', 'sits']
['cat', 'sits', 'on']
['cat', 'sits', 'on', 'the']
['cat', 'sits', 'on', 'the', 'mat']
['cat', 'sits', 'on', 'the', 'mat', 'eating']
['cat', 'sits', 'on', 'the', 'mat', 'eating', 'a']
['cat', 'sits', 'on', 'the', 'mat', 'eating', 'a', 'rat']
['sits', 'on']
['sits', 'on', 'the']
['sits', 'on', 'the', 'mat']
['sits', 'on', 'the', 'mat', 'eating']
['sits', 'on', 'the', 'mat', 'eating', 'a']
['sits', 'on', 'the', 'mat', 'eating', 'a', 'rat']
['on', 'the']
['on', 'the', 'mat']
['on', 'the', 'mat', 'eating']
['on', 'the', 'mat', 'eating', 'a']
['on', 'the', 'mat', 'eating', 'a', 'rat']
['the', 'mat']
['the', 'mat', 'eating']
['the', 'mat', 'eating', 'a']
['the', 'mat', 'eating', 'a', 'rat']
['mat', 'eating']
['mat', 'eating', 'a']
['mat', 'eating', 'a', 'rat']
['eating', 'a']
['eating', 'a', 'rat']
['a', 'rat']

关于python - 打印给定字符串中所有可能的短语(单词的连续组合)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24964862/