方法一：使用列表推导式
vec = [[1,2,3],[4,5,6],[7,8,9]]
get = [num for elem in vec for num in elem]
get
[1, 2, 3, 4, 5, 6, 7, 8, 9]
方法相当于
vec = [[1,2,3],[4,5,6],[7,8,9]]
result = []
for elem in vec:
for num in elem:
result.append(num)
result
[1, 2, 3, 4, 5, 6, 7, 8, 9]
方法二：
使用sum函数
vec = [[1,2,3],[4,5,6],[7,8,9]]
get = sum(vec,[])
get
[1, 2, 3, 4, 5, 6, 7, 8, 9]
或者是使用chain函数
vec = [[1,2,3],[4,5,6],[7,8,9]]
from itertools import chain
list(chain(*vec))
[1, 2, 3, 4, 5, 6, 7, 8, 9]
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原文链接：https://blog.csdn.net/guo_ridgepole/article/details/79953979
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