本文介绍如何在Python3中创建具有n行和m列的数组，详细阐述了具体的实现步骤和方法。
创建2维数组
python3
Python 3.7.4 (default, Aug 13 2019, 20:35:49)
[GCC 7.3.0] :: Anaconda, Inc. on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> len =5
>>> matrix = [None]*len
>>> print(matrix)
[None, None, None, None, None]
创建n行m列数组
设 n = 2 ,m = 3
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
matrix = [None]*2
for i in range(len(matrix)):
matrix[i] = [0]*3
print(matrix)
运行结果：
[[0, 0, 0], [0, 0, 0]]
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