python list 内嵌列表转为一维列表_猪宝贝的博客_python 列表转一维数组

# 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]# 只能是内嵌列表，如果改为 a = [[1,2,3],[4,5,6], [7], [8,9]