如何在Python中创建嵌套列表? [英] How to create nested lists in python?

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问题描述

我知道你可以创建在python容易嵌套列表如下:

  [1,2],[3,4]

但如何创建零的一个3x3x3的矩阵?

  [[[0] * 3 i的范围(0,3)]在范围Ĵ(0,3)]

  [[[0] * 3] * 3] * 3

好像没有吧。有没有办法来创建它刚好路过尺寸的列表的方法?例如:

  CreateArray([3,3,3])


解决方案

在情况下,矩阵其实你所寻找的是,考虑到numpy的软件包。

http://docs.scipy.org/doc/numpy/reference/generated/numpy.zeros.html#numpy.zeros

这会给你一个零3x3x3的数组:

  numpy.zeros((3,3,3))

您也受益于科学计算构建模块的便利功能。

I know you can create easily nested lists in python like this:

[[1,2],[3,4]]

But how to create a 3x3x3 matrix of zeroes?

[[[0] * 3 for i in range(0, 3)] for j in range (0,3)]

or

[[[0]*3]*3]*3

Doesn't seem right. There is no way to create it just passing a list of dimensions to a method? Ex:

CreateArray([3,3,3])

解决方案

In case a matrix is actually what you are looking for, consider the numpy package.

http://docs.scipy.org/doc/numpy/reference/generated/numpy.zeros.html#numpy.zeros

This will give you a 3x3x3 array of zeros:

numpy.zeros((3,3,3)) 

You also benefit from the convenience features of a module built for scientific computing.

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