Python : Use dictionary to simulate multi-dimension array

Since there is no array in Python. Use dictionary instead.

Follows are the example to initialize a 2x2 array

>>>a={}
>>>for i in range(4):
. . .      a[i/2, i%2] = i
>>> a
{ (0,1):1, (1,0):2, (0,0):0, (1,1):3 }
>>>a[0,1]
1