在python中合并两个列表的最快方法是什么? [英] What is the fastest way to merge two lists in python?

问题描述

给出

list_1 = [1,2,3,4]
list_2 = [5,6,7,8]

在python中实现以下目标的最快方法是什么?

What is the fastest way to achieve the following in python?

list = [1,2,3,4,5,6,7,8]

请注意，有很多方法可以在python中合并两个列表.我正在寻找最省时的方法.

Please note that, there can be many ways to merge two lists in python. I am looking for the most time efficient way.

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感谢所有答案.了解您的想法后，我尝试了以下操作，这是我的理解.

Thanks for all the answers. Getting your ideas, I tried the following and here is my understanding.

CODE

import time

c = list(range(1,10000000))
c_n = list(range(10000000, 20000000))

start = time.time()
c = c+c_n
print len(c)
print time.time() - start

c = list(range(1,10000000))
start = time.time()
for i in c_n:
    c.append(i)
print len(c)
print time.time() - start

c = list(range(1,10000000))
start = time.time()
c.extend(c_n)
print len(c)
print time.time() - start

输出

19999999
0.125061035156
19999999
1.02858018875
19999999
0.03928399086

因此，如果某人不愿意在问题中重复使用list_1/list_2，则可以采用扩展的方式.另一方面，"+" 是最快的方法.

So, if someone does not bother reusing list_1/list_2 in the question then extend is the way to go. On the other hand, "+" is the fastest way.

我不确定其他选项.

再次感谢:-)

推荐答案

您可以使用串联:

list = list_1 + list_2

如果您不需要保留list_1，则可以对其进行修改:

If you don't need to keep list_1 around, you can just modify it:

list_1.extend(list_2)

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