还可以使用itertools.chain（）创建一个生成器，简单地迭代两个列表中的项目。这允许您将列表（或任何可迭代的）链接在一起进行处理，而无需将项目复制到新列表：

import itertools
for item in itertools.chain(listone, listtwo):
    # Do something with each list item

可以使用集合获取唯一值的合并列表

mergedlist = list(set(listone + listtwo))

您可以使用在列表对象上定义的append（）方法：

mergedlist =[]
for elem in listone:
    mergedlist.append(elem)
for elem in listtwo:
    mergedlist.append(elem)

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]

 a = [1, 2, 3]
 b = [4, 5, 6]
     
 c = a + b
 print(c)

输出

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

在上面的代码中，“+”运算符用于将两个列表连接成一个列表。

另一种解决方案

 a = [1, 2, 3]
 b = [4, 5, 6]
 c = [] # Empty list in which we are going to append the values of list (a) and (b)

 for i in a:
     c.append(i)
 for j in b:
     c.append(j)

 print(c)

输出

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

您可以简单地使用+或+=运算符，如下所示：

a = [1, 2, 3]
b = [4, 5, 6]

c = a + b

Or:

c = []
a = [1, 2, 3]
b = [4, 5, 6]

c += (a + b)

此外，如果希望合并列表中的值是唯一的，可以执行以下操作：

c = list(set(a + b))