python 数组初始化
一维数组初始化:
a = [0]*5
a
[0, 0, 0, 0, 0]
a[1]=1
a
[0, 1, 0, 0, 0]
使用列表生成器初始化二维数组:
b = [[0]*5 for _ in range(5)]
b
[[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0]]
b[3][3] = 3
b
[[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 0, 0],
[0, 0, 0, 3, 0],
[0, 0, 0, 0, 0]]