# Python 交错合并多个list列表的方法及示例代码

``````l1 = ["a","b","c","d"]
l2 = [1,2,3,4]
l3 = ["w","x","y","z"]
l4 = [5,6,7,8]
``````

``````l5 = ["a",1,"w",5,"b",2,"x",6,"c",3,"y",7,"d",4,"z",8]
``````

## 1、直接使用"+"号合并列表

``````l5 = l1 + l2 + l3 + l4
``````

## 2、使用extend方法

``````l5 = l1.extend(l2,l3,l4,l5)
``````

## 3、使用append方法

``````aList = [1,2,3]
bList = ['www', 'jb51.net']
aList.append(bList)
print(aList)

# 输出：

[1, 2, 3, ['www', 'jb51.net']]
``````

## 4、使用zip()实现

``````l1 = ["a", "b", "c", "d"]
l2 = [1, 2, 3, 4]
l3 = ["w", "x", "y", "z"]
l4 = [5, 6, 7, 8]
l5 = [x for y in zip(l1, l2, l3, l4) for x in y]
print(l5)
``````

``````['a', 1, 'w', 5, 'b', 2, 'x', 6, 'c', 3, 'y', 7, 'd', 4, 'z', 8]
``````

## 5、使用itertools.chain() 和 zip()

``````from itertools import chain
l1 = ["a", "b", "c", "d"]
l2 = [1, 2, 3, 4]
l3 = ["w", "x", "y", "z"]
l4 = [5, 6, 7, 8]
print(list(chain(*zip(l1, l2, l3, l4))))
``````

# 或者

``````print(list(chain.from_iterable(zip(l1, l2, l3, l4))))
``````

## 6、使用itertools实现

``````from itertools import cycle, islice
l1 = ["a","b","c","d"]
l2 = [1,2,3,4]
l3 = ["w","x","y","z"]
l4 = [5,6,7,8]

lists = [l1, l2, l3, l4]
def roundrobin(*iterables):
"roundrobin('ABC', 'D', 'EF') --> A D E B F C"
# Recipe credited to George Sakkis
num_active = len(iterables)
nexts = cycle(iter(it).__next__ for it in iterables)
while num_active:
try:
for next in nexts:
yield next()
except StopIteration:
# Remove the iterator we just exhausted from the cycle.
num_active -= 1
nexts = cycle(islice(nexts, num_active))
print(*roundrobin(*lists))
``````

## 7、使用切片实现

``````l1 = ["a","b","c","d"]
l2 = [1,2,3,4]
l3 = ["w","x","y","z"]
l4 = [5,6,7,8]
lists = [l1, l2, l3, l4]
lst = [None for _ in range(sum(len(l) for l in lists))]
for i, l in enumerate(lists):
lst[i:len(lists)*len(l):len(lists)] = l
print(lst)

# demo1
aList = [1,2,3]
bList = ['www', 'jb51.net']
aList[len(aList):len(aList)] = bList
print(aList)
# 输出：
[1, 2, 3, 'www', 'jb51.net']

# demo2
aList = [1,2,3]
bList = ['www', 'jb51.net']
aList[1:1] = bList
print(aList)
# 输出为：

[1, 'www', 'jb51.net', 2, 3]
``````

## 8、使用pandas实现

``````import pandas as pd
l1 = ["a","b","c","d"]
l2 = [1,2,3,4]
l3 = ["w","x","y","z"]
l4 = [5,6,7,8]
df = pd.DataFrame([l1 ,l2, l3, l4])
result = list(df.values.flatten('A'))
print(result)
``````

## 9、使用numpy.dstack和flatten实现

``````import numpy as np
l1 = ["a","b","c","d"]
l2 = [1,2,3,4]
l3 = ["w","x","y","z"]
l4 = [5,6,7,8]
print(np.dstack((np.array(l1),np.array(l2),np.array(l3),np.array(l4))).flatten())
``````

# 或者

``````print(np.dstack((l1,l2,l3,l4)).flatten())
``````

## 10、使用zip() 和 np.concatenate()实现

``````import numpy as np
l1 = ["a","b","c","d"]
l2 = [1,2,3,4]
l3 = ["w","x","y","z"]
l4 = [5,6,7,8]
l5 = np.concatenate(list(zip(l1, l2, l3, l4)))
print(l5)
``````

## 11、使用zip()和reduce()

``````import functools, operator
l1 = ["a","b","c","d"]
l2 = [1,2,3,4]
l3 = ["w","x","y","z"]
l4 = [5,6,7,8] 