遍歷列表以三個項目同時

Question

如果我有一個列表：

["A","Bb","C","D","E","F","G"] 

我怎麼可以遍歷它，這樣我可以輸出如下：

"A Bb C" 
"D E F" 
"G" 

Answer 1

獲取的子列表[0:3]，[3:6]，[6:9]，...

>>> xs = ["A","Bb","C","D","E","F","G"] 
>>> [' '.join(xs[i:i+3]) for i in range(0, len(xs), 3)] 
['A Bb C', 'D E F', 'G'] 

Answer 2

是，我記食譜p掛在身邊。

def chunks(l, n): 
    for i in xrange(0, len(l), n): 
     yield l[i:i+n] 

Answer 3

你可以在這裏使用itertools.izip_longest：

>>> from itertools import izip_longest 
>>> L = ["A","Bb","C","D","E","F","G"] 
>>> for item in izip_longest(*[iter(L)]*3, fillvalue=''): 
...  print ' '.join(item) 
... 
A Bb C 
D E F 
G