python - 添加两个列表的最佳方式？

Question

我有两个列表

list1 = [(100, A, 22), (200,B, 33), (300, C, 44)]

和

list2 = [(100,A,333), (200,B,444), (500, D, 555)]

所以我想要的最终列表是

final_list = [ (100,A, 22, 333), (200,B,33,444), (300,C,44,0), (500,D,0,555)]

如果我只是添加两个列表，它不会帮助我。我怎样才能获得最终名单。

谢谢

Answer 1

您的输入数据首先应该是字典:

dict1 = {(100, "A"): 22, (200,"B"): 33, (300, "C"): 44}
dict2 = {(100, "A"): 333, (200,"B"): 444, (500, "D"): 555}

现在您可以轻松构建组合字典:

>>> {k: (dict1.get(k, 0), dict2.get(k, 0))
...  for k in dict1.viewkeys() | dict2.viewkeys()}
{(100, 'A'): (22, 333), (200, 'B'): (33, 444), 
 (300, 'C'): (44, 0), (500, 'D'): (0, 555)}

( python 2.7)

如果出于某种原因你需要对列表进行操作，我建议先把你的列表变成字典

dict1 = {(k1, k2): v for k1, k2, v in list1}
dict2 = {(k1, k2): v for k1, k2, v in list2}