如何将一个句子分成几个短语？

Question

我想把一个句子分成几个有意义的部分，例如：我有一个来自用户的输入： Samsung phone case ，我想分成一个列表：['三星手机'，'手机壳'，'三星手机壳' ]，这意味着'三星手机'是一个有效对象，'手机壳'是另一个有效对象，'三星手机壳'也是一个有效对象，如何用python做到这一点？

Answer 1

It doesn't look like you want a split, but rather combinations (or some kind of power set). Splitting is a necessary intermediate though:

s = 'Samsung phone case'

from itertools import combinations, chain

l = s.split()
list(chain(*(map(' '.join, combinations(l, r=n)) for n in range(2,len(l)+1))))

output:

['Samsung phone', 'Samsung case', 'phone case', 'Samsung phone case']

Answer 2

You can use indexing if you know the input string. For example:

txt = "Samsung phone case"

x = txt[0:13]
y = txt[8:19]

new_txt = [x, y, txt]

print(new_txt)

The output will be:

>>> ['Samsung phone', 'phone case', 'Samsung phone case']

Alternatively, you can use Regular Expressions, such as:

import re
txt = ['Samsung phone case']
x = re.search('(.*?) (case)', txt).group(1) 

and so on.