Python itertools関数：矛盾した出力

Question

私はこれらのスクリプトの出力が矛盾している理由について熟考してきました。誰も私にこれを手伝ってもらえますか？

import itertools 
from itertools import tee 
from itertools import islice 

words = ['Salad','with','Chocolate','and','potatoes'] 
nwise = lambda xs,n=2: zip(*(islice(xs,idx,None) for idx,xs in enumerate(tee(xs,n)))) 
doubles = list(map(lambda x: " ".join(x), nwise(words,2))) 
triples = list(map(lambda x: " ".join(x), nwise(words,3))) 
quadrouples = list(map(lambda x: " ".join(x), nwise(words,4))) 
words.extend(doubles) 
words.extend(triples) 
words.extend(quadrouples) 
print(words) 

この結果は、この結果は、なぜ範囲（）関数でforループ線バイへの一貫性のない結果を生成しない['Salad', 'with', 'Chocolate', 'and', 'potatoes', 'Salad with', 'with Chocolate', 'Chocolate and', 'and potatoes', 'Salad with Chocolate', 'with Chocolate and', 'Chocolate and potatoes', 'and potatoes Salad with', 'potatoes Salad with with Chocolate', 'Salad with with Chocolate Chocolate and', 'with Chocolate Chocolate and and potatoes', 'Salad with Chocolate and', 'with Chocolate and potatoes', 'Chocolate and potatoes Salad with', 'and potatoes Salad with with Chocolate', 'potatoes Salad with with Chocolate Chocolate and', 'Salad with with Chocolate Chocolate and and potatoes', 'with Chocolate Chocolate and and potatoes Salad with Chocolate', 'Chocolate and and potatoes Salad with Chocolate with Chocolate and', 'and potatoes Salad with Chocolate with Chocolate and Chocolate and potatoes', 'Salad with Chocolate with Chocolate and Chocolate and potatoes and potatoes Salad with', 'with Chocolate and Chocolate and potatoes and potatoes Salad with potatoes Salad with with Chocolate', 'Chocolate and potatoes and potatoes Salad with potatoes Salad with with Chocolate Salad with with Chocolate Chocolate and', 'and potatoes Salad with potatoes Salad with with Chocolate Salad with with Chocolate Chocolate and with Chocolate Chocolate and and potatoes']

ある['Salad', 'with', 'Chocolate', 'and', 'potatoes', 'Salad with', 'with Chocolate', 'Chocolate and', 'and potatoes', 'Salad with Chocolate', 'with Chocolate and', 'Chocolate and potatoes', 'Salad with Chocolate and', 'with Chocolate and potatoes']

import itertools 
from itertools import tee 
from itertools import islice 

words = ['Salad','with','Chocolate','and','potatoes'] 
nwise = lambda xs,n=2: zip(*(islice(xs,idx,None) for idx,xs in enumerate(tee(xs,n)))) 
for i in range(2,5): 
    new = list(map(lambda x: " ".join(x), nwise(words,i))) 
    words.extend(new) 
print(words) 

ありますラインアプローチ？

Answer 1

修正するためにループするときは、一般にcreate a new collectionより安全です。

新しいリストに拡張します。 words_：

あるいは

... 
words_ = [] 
for i in range(2, 5): 
    new = list(map(lambda x: " ".join(x), nwise(words,i))) 
    words_.extend(new) 
print(words_) 

---

、所望の結果のnewリストと既存のwordsリストを拡張します。

は交換してください：

... 
new = [" ".join(x) for i in range(2, 5) for x in nwise(words,i)] 
words.extend(new) 
...