How to make a copy of a 2D array in Python?

2018-05-30 13:18:10

This question already has an answer here:

Copying nested lists in Python 2 answers

How to clone or copy a list? 17 answers

Try this:

from copy import copy, deepcopy
y = deepcopy(x)

I'm not sure, maybe copy() is sufficient.

Using deepcopy() or copy() is a good solution. For a simple 2D-array case

y = [row[:] for row in x]

对于二维数组，可以使用映射函数：

old_array = [[2, 3], [4, 5]]
# python2.*
new_array = map(list, old_array)
# python3.*
new_array = list(map(list, old_array))

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