python - Merge lists without ordering and not eliminating duplicates

Question

(Python) I have 2 lists and want to merge them as follows.

a = [2,5,1]
b = [4,2,2]

Combine lists and the expected output should be: [2,5,1,4,2,2]

Answer 1

使用+：

a + b

这将创建一个新列表，它是两个输入列表的串联。

Answer 2

还有扩展功能，这只是a扩展b：

a = [2,5,1]
b = [4,2,2]
a.extend(b)

要创建一个新列表，例如：c即使 nneonneo 答案更简单，也可以执行以下操作：

def extendList(a, b):
    a.extend(b)
    return a

a = [2,5,1]
b = [4,2,2]
c = extendList(a, b)