Python将二维数组/多维数组转换为一维

Python将二维数组/多维数组转换为一维

方法1：flatten

import numpy as np
mulArrays = [[1,2,3],[4,5,6],[7,8,9]]
print(list(np.array(mulArrays).flatten()))

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方法2：reshape+concatenate

import numpy as np
mulArrays = [[1,2,3],[4,5,6],[7,8,9]]
print(list(np.concatenate(array.reshape((-1,1),order="F"))))

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方法3：sum()

mulArrays = [[1,2,3],[4,5,6],[7,8,9]]
print(sum(mulArrays,[])) #[1, 2, 3, 4, 5, 6, 7, 8, 9]

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方法4：列表推导式

mulArrays = [[1,2,3],[4,5,6],[7,8,9]]
print([i for arr in mulArrays for i in arr]) #[1, 2, 3, 4, 5, 6, 7, 8, 9]

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方法5：operator

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

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方法6：使用库函数itertools

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

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参考博文：
https://leejason.blog.csdn.net/article/details/106928360