python列表连接效率 [英] python list concatenation efficiency

问题描述

在以下情况下，连接两个列表list_a和list_b的最有效方法是什么?

What is the most efficient way to concatenate two lists list_a and list_b when:

• list_b个项目必须放在list_a个项目之前
• 结果必须放在list_a
中

• list_b items have to be placed before list_a items
• the result must be placed in list_a

我有4种可能:

# 1
list_a = list_b + list_a

# 2
for item in list_b:
    list_a.insert(0, item)

# 3
for item in self.list_a:
    list_b.append(item)
list_a = list_b

# 4
list_a[0:0] = list_b

谢谢！

推荐答案

以下是有关 BigYellowCactus 随着列表长度的增加而发展.垂直轴是在usec中初始化两个列表并将一个列表插入另一个列表所需的时间.横轴是列表中的项目数.

Here's a graph of how the timings used in the answer of BigYellowCactus develop as the length of the lists increase. The vertical axis is the time required to initialize both lists and insert one in front of the other, in usec. The horizontal axis is the number of items in the lists.

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