使用+运算符组合列表：

listone = [1, 2, 3]
listtwo = [4, 5, 6]

joinedlist = listone + listtwo

输出：

>>> joinedlist
[1, 2, 3, 4, 5, 6]

如果要以排序形式合并这两个列表，可以使用heapq库中的merge函数。

from heapq import merge

a = [1, 2, 4]
b = [2, 4, 6, 7]

print list(merge(a, b))

另一种方式：

>>> listone = [1, 2, 3]
>>> listtwo = [4, 5, 6]
>>> joinedlist = [*listone, *listtwo]
>>> joinedlist
[1, 2, 3, 4, 5, 6]
>>> 

我能找到的加入列表的所有可能方法

import itertools

A = [1,3,5,7,9] + [2,4,6,8,10]

B = [1,3,5,7,9]
B.append([2,4,6,8,10])

C = [1,3,5,7,9]
C.extend([2,4,6,8,10])

D = list(zip([1,3,5,7,9],[2,4,6,8,10]))
E = [1,3,5,7,9]+[2,4,6,8,10]
F = list(set([1,3,5,7,9] + [2,4,6,8,10]))

G = []
for a in itertools.chain([1,3,5,7,9], [2,4,6,8,10]):
    G.append(a)


print("A: " + str(A))
print("B: " + str(B))
print("C: " + str(C))
print("D: " + str(D))
print("E: " + str(E))
print("F: " + str(F))
print("G: " + str(G))

输出

A: [1, 3, 5, 7, 9, 2, 4, 6, 8, 10]
B: [1, 3, 5, 7, 9, [2, 4, 6, 8, 10]]
C: [1, 3, 5, 7, 9, 2, 4, 6, 8, 10]
D: [(1, 2), (3, 4), (5, 6), (7, 8), (9, 10)]
E: [1, 3, 5, 7, 9, 2, 4, 6, 8, 10]
F: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
G: [1, 3, 5, 7, 9, 2, 4, 6, 8, 10]

组合列表列表的一种非常简洁的方法是

list_of_lists = [[1,2,3], [4,5,6], [7,8,9]]
reduce(list.__add__, list_of_lists)

这给了我们

[1, 2, 3, 4, 5, 6, 7, 8, 9]

如果使用的是NumPy，可以使用以下命令连接两个兼容维度的数组：

numpy.concatenate([a,b])