python list 内嵌列表转为一维列表

python list 内嵌列表转为一维列表

只能是内嵌列表，如果改为 a = [[1,2,3],[4,5,6], [7], [8,9] , 10] 则无法实现

import itertools
a = [[1,2,3],[4,5,6], [7], [8,9]]
out = list(itertools.chain.from_iterable(a))
print(out)

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

只能是内嵌列表，如果改为 a = [[1,2,3],[4,5,6], [7], [8,9] , 10] 则无法实现

使用 operater.add, reduce

import operator
from functools import reduce
a = [[1,2,3], [4,5,6], [7,8,9]]
aa = reduce(operator.add, a)
print(aa)

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

可以展开任意维的列表, 使用匿名函数 lambda

func = lambda x: [y for l in x for y in func(l)] if type(x) is list else [x]

a = [[1,2,3], [4,5,6], [7], [8,9], ‘c’]
result = func(a)
print(result)

[1, 2, 3, 4, 5, 6, 7, 8, 9, ‘c’]

b = [[1,2,3], [4,5,6], [7], [8,9] , 10]
result = func(b)
print(result)

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

https://blog.youkuaiyun.com/u010652755/article/details/105549848?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.nonecase&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.nonecase