python 开数组

 

列表推导式~

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N=int(10)   #二维数组 a=[[j for i in range(N)] for j in range(20)]   a[1][1]=8 a[1][2]=2   for i in range(N):     for j in range(N):         print(a[i][j],end=' ')     print('')     # 多维数组 a=[[[i for j in range(N)] for k in range(3)] for i in range(5)]   for i in range(5):     for j in range(M):         print(a[i][j])     print('')