如何從兩個字串串列的笛卡爾積創建串列

我有兩個看起來像這樣的字串串列：

print(objects_list)
print(verb_list)

他們輸出：

['parking_meter', 'sink', 'teddy_bear']
 
 ['sail', 'fill', 'fly', 'greet', 'hit', 'hose', 'hunt', 'install',
 'kick', 'launch', 'move', 'pick', 'repair', 'sit_at', 'squeeze',
 'stab', 'straddle', 'talk_on']

我想要這兩個串列的產品，格式如下：

[['parking_meter','sail'],['parking_meter','fill'],['parking_meter','fly']......]

我試過這個代碼

list3 = [[str(l),str(n)] for l in objects_list for n in verb_list]
print(list3)

但它輸出：

[['[', '['], ['[', "'"], ['[', 's'], ['[', 'a'], ['[', 'i'], ['[',
 'l'], ['[', "'"], ['[', ','], ['[', ' '], ['[', "'"], ['[', 'f'],
 ['[', 'i'], ['[', 'l'], ['[', 'l'], ['[', "'"], ['[', ','], ['[', '
 '], ['[', "'"], ['[', 'f'], ['[', 'l'], ['[', 'y'], [.....

任何解決方案？

uj5u.com熱心網友回復：

您的代碼應該按原樣作業。我懷疑您的實際代碼中有一些其他不必要的 str() 函式呼叫：

objects_list = ['parking_meter', 'sink', 'teddy_bear']
verb_list = ['sail', 'fill', 'fly', 'greet', 'hit', 'hose',
             'hunt', 'install', 'kick', 'launch', 'move', 
             'pick', 'repair', 'sit_at', 'squeeze', 'stab', 
             'straddle', 'talk_on']

list3 = [[o,v] for o in objects_list for v in verb_list]

[['parking_meter', 'sail'], ['parking_meter', 'fill'], ['parking_meter', 'fly'], ['parking_meter', 'greet'], ['parking_meter', 'hit'], ['parking_meter', 'hose'], ['parking_meter', 'hunt'], ['parking_meter', 'install'], ['parking_meter', 'kick'], ['parking_meter', 'launch'], ['parking_meter', 'move'], ['parking_meter', 'pick'], ['parking_meter', 'repair'], ['parking_meter', 'sit_at'], ['parking_meter', 'squeeze'], ['parking_meter', 'stab'], ['parking_meter', 'straddle'], ['parking_meter', 'talk_on'], ['sink', 'sail'], ['sink', 'fill'], ['sink', 'fly'], ['sink', 'greet'], ['sink', 'hit'], ['sink', 'hose'], ['sink', 'hunt'], ['sink', 'install'], ['sink', 'kick'], ['sink', 'launch'], ['sink', 'move'], ['sink', 'pick'], ['sink', 'repair'], ['sink', 'sit_at'], ['sink', 'squeeze'], ['sink', 'stab'], ['sink', 'straddle'], ['sink', 'talk_on'], ['teddy_bear', 'sail'], ['teddy_bear', 'fill'], ['teddy_bear', 'fly'], ['teddy_bear', 'greet'], ['teddy_bear', 'hit'], ['teddy_bear', 'hose'], ['teddy_bear', 'hunt'], ['teddy_bear', 'install'], ['teddy_bear', 'kick'], ['teddy_bear', 'launch'], ['teddy_bear', 'move'], ['teddy_bear', 'pick'], ['teddy_bear', 'repair'], ['teddy_bear', 'sit_at'], ['teddy_bear', 'squeeze'], ['teddy_bear', 'stab'], ['teddy_bear', 'straddle'], ['teddy_bear', 'talk_on']]

uj5u.com熱心網友回復：

試試這個，使用 itertools 庫。有一個名為 product 的函式可以為您提供笛卡爾積。

import itertools

x = ['parking_meter', 'sink', 'teddy_bear']

y = ['sail', 'fill', 'fly', 'greet', 'hit', 'hose', 'hunt', 'install', 'kick', 'launch', 'move', 'pick', 'repair', 'sit_at', 'squeeze', 'stab', 'straddle', 'talk_on']

然后你可以做這個 2-liner，（因為 product 函式回傳一個元組，但你需要一個串列）

z = list(itertools.product(x,y))
z = [list(z) for z in z]

或者這個 1-liner，

z = [list(tup) for tup in list(itertools.product(x, y))]

然后我，

print (z)

這給了我

[['parking_meter', 'sail'],
 ['parking_meter', 'fill'],
 ['parking_meter', 'fly'],
 ['parking_meter', 'greet'],
 ['parking_meter', 'hit'],
 ['parking_meter', 'hose'],
 ['parking_meter', 'hunt'],
 ['parking_meter', 'install'],
 ['parking_meter', 'kick'],
 ['parking_meter', 'launch'],
 ['parking_meter', 'move'],
 ['parking_meter', 'pick'],
 ['parking_meter', 'repair'],
 ['parking_meter', 'sit_at'],
 ['parking_meter', 'squeeze'],
 ['parking_meter', 'stab'],
 ['parking_meter', 'straddle'],
 ['parking_meter', 'talk_on'],
 ['sink', 'sail'],
 ['sink', 'fill'],
 ['sink', 'fly'],......

uj5u.com熱心網友回復：

從您得到的輸出來看，您的輸入串列似乎是字串，而不是串列。

好像objects_list是 的輸出print(objects_list)，而不是串列本身。

因此，在迭代 時objects_list，而不是在串列項上進行迭代，您是在迭代其字串表示的字符：

"["
"'"
"p"
"a"
...

您的代碼在其他方面是正確的，除非您不需要在串列理解中將元素轉換為字串。

list3 = [[l, n] for l in objects_list for n in verb_list]

uj5u.com熱心網友回復：

你的代碼作業得很好，并給了我預期的輸出。我不確定是否還有其他問題。可能是您的串列不像我那樣宣告...如果您是從其他來源創建此串列...您應該檢查格式。

注意：我已在 Python 3.9.5 上運行此代碼

objects_list = ['parking_meter', 'sink', 'teddy_bear']
verb_list = ['sail', 'fill', 'fly', 'greet', 'hit', 'hose', 'hunt', 'install', 'kick', 'launch', 'move', 'pick', 'repair', 'sit_at', 'squeeze', 'stab', 'straddle', 'talk_on'] 

list3 = [[str(l),str(n)] for l in objects_list for n in verb_list] 
print(list3)

Output:
[['parking_meter', 'sail'], ['parking_meter', 'fill'], ['parking_meter', 'fly']['parking_meter', 'greet'], ['parking_meter', 'hit'], ['parking_meter', 'hose'], ['parking_meter', 'hunt'], ['parking_meter', 'install'], ['parking_meter', 'kick'], ['parking_meter', 'launch'], ['parking_meter', 'move'], ['parking_meter', 'pick'], ['parking_meter', 'repair'], ['parking_meter', 'sit_at'], ['parking_meter', 'squeeze'], ['parking_meter', 'stab'], ['parking_meter', 'straddle'], ['parking_meter', 'talk_on'], ['sink', 'sail'], ['sink', 'fill'], ['sink', 'fly'], ['sink', 'greet'], ['sink', 'hit'], ['sink', 'hose'], ['sink', 'hunt'], ['sink', 'install'], ['sink', 'kick'], ['sink', 'launch'], ['sink', 'move'], ['sink', 'pick'], ['sink', 'repair'], ['sink', 'sit_at'], ['sink', 'squeeze'], ['sink', 'stab'], ['sink', 'straddle'], ['sink', 'talk_on'], ['teddy_bear', 'sail'], ['teddy_bear', 'fill'], ['teddy_bear', 'fly'], ['teddy_bear', 'greet'], ['teddy_bear', 'hit'], ['teddy_bear', 'hose'], ['teddy_bear', 'hunt'], ['teddy_bear', 'install'], ['teddy_bear', 'kick'], ['teddy_bear', 'launch'], ['teddy_bear', 'move'], ['teddy_bear', 'pick'], ['teddy_bear', 'repair'], ['teddy_bear', 'sit_at'], ['teddy_bear', 'squeeze'], ['teddy_bear', 'stab'], ['teddy_bear', 'straddle'], ['teddy_bear', 'talk_on']]

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