2d array of lists in python

Question

I am trying to create a 2d matrix so that each cell contains a list of strings. Matrix dimensions are known before the creation and I need to have access to any element from

Answer 1

One option is to write your own class, where you overload the [] operator. Take a look for that in here: http://www.penzilla.net/tutorials/python/classes/ . Acessing a 2d elment in 1d is y * rowSize + x. Extending the elements by writing an append function, which would use append rowSize times.

If you want to create a 2d matrix and you need to preallocate than, you could do the following:

x,y = 3,3
A = [ [None]*x for i in range(y) ]

You can replace None with the value you want. And you can use .extend to add additional values.