Python - 按順序拆分字符串

Question

也就是說，對於一個句子，將它分解為所有可能的有序單詞組合，沒有遺漏任何單詞

例如，對於輸入“The cat sat on the mat”

輸出

[("The", "cat sat on the mat"),
("The cat", "sat on the mat"),  
("The cat", "sat", "on the mat")] #etc

但不是

("The mat", "cat sat on the") # out of order
("The cat"), ("mat") # words missing

我查看了 itertools 中的方法，但看不到它們的作用，因為組合會遺漏項目（“貓”、“墊子”）並且排列會改變順序。

我是否遺漏了這些工具中的某些東西，或者它們只是不正確的東西？

（為了清楚起見，這不是關於如何拆分字符串的問題，而是關於如何獲得組合的問題）

Answer 1

根據 WordAligned 的這篇博客文章的啟發，修改Raymond Hettinger 的Python 3分區配方，以及您列表中的每個分區案例，我們可以使用 itertools 中的chain和combinations來完成此操作。

from itertools import chain, combinations
def partition(iterable):
    n = len(input_list)
    b, mid, e = [0], list(range(1, n)), [n]
    getslice = input_list.__getitem__
    splits = (d for i in range(n) for d in combinations(mid, i))
    return [[input_list[sl] for sl in map(slice, chain(b, d), chain(d, e))]
            for d in splits]

演示：

>>> print(partition(input_list))
[[['The', 'cat', 'sat', 'on', 'the', 'mat']], [['The'], ['cat', 'sat', 'on', 'the', 'mat']], [['The', 'cat'], ['sat', 'on', 'the', 'mat']], [['The', 'cat', 'sat'], ['on', 'the', 'mat']], [['The', 'cat', 'sat', 'on'], ['the', 'mat']], [['The', 'cat', 'sat', 'on', 'the'], ['mat']], [['The'], ['cat'], ['sat', 'on', 'the', 'mat']], [['The'], ['cat', 'sat'], ['on', 'the', 'mat']], [['The'], ['cat', 'sat', 'on'], ['the', 'mat']], [['The'], ['cat', 'sat', 'on', 'the'], ['mat']], [['The', 'cat'], ['sat'], ['on', 'the', 'mat']], [['The', 'cat'], ['sat', 'on'], ['the', 'mat']], [['The', 'cat'], ['sat', 'on', 'the'], ['mat']], [['The', 'cat', 'sat'], ['on'], ['the', 'mat']], [['The', 'cat', 'sat'], ['on', 'the'], ['mat']], [['The', 'cat', 'sat', 'on'], ['the'], ['mat']], [['The'], ['cat'], ['sat'], ['on', 'the', 'mat']], [['The'], ['cat'], ['sat', 'on'], ['the', 'mat']], [['The'], ['cat'], ['sat', 'on', 'the'], ['mat']], [['The'], ['cat', 'sat'], ['on'], ['the', 'mat']], [['The'], ['cat', 'sat'], ['on', 'the'], ['mat']], [['The'], ['cat', 'sat', 'on'], ['the'], ['mat']], [['The', 'cat'], ['sat'], ['on'], ['the', 'mat']], [['The', 'cat'], ['sat'], ['on', 'the'], ['mat']], [['The', 'cat'], ['sat', 'on'], ['the'], ['mat']], [['The', 'cat', 'sat'], ['on'], ['the'], ['mat']], [['The'], ['cat'], ['sat'], ['on'], ['the', 'mat']], [['The'], ['cat'], ['sat'], ['on', 'the'], ['mat']], [['The'], ['cat'], ['sat', 'on'], ['the'], ['mat']], [['The'], ['cat', 'sat'], ['on'], ['the'], ['mat']], [['The', 'cat'], ['sat'], ['on'], ['the'], ['mat']], [['The'], ['cat'], ['sat'], ['on'], ['the'], ['mat']]]