在python中创建指定大小的多维数组方式

n = 2

m = 3

matrix = [None]*2

for i in range(len(matrix)):

matrix[i] = [0]*3

print(matrix)

n = 2

m = 3

matrix = [[0]*m for i in range(n)]

print(matrix)

matrix[0][0] = 1

print(matrix)

n = 2

m = 3

k = 4

matrix = [None]*2

for i in range(len(matrix)):

matrix[i] = [0]*3

print(matrix)

 
for i in range(n):

for j in range(m):

matrix[i][j] = [1]*k

 
print(matrix)