# Python Language Multidimensional arrays Lists in lists

## Example

A good way to visualize a 2d array is as a list of lists. Something like this:

``````lst=[[1,2,3],[4,5,6],[7,8,9]]
``````

here the outer list `lst` has three things in it. each of those things is another list: The first one is: `[1,2,3]`, the second one is: `[4,5,6]` and the third one is: `[7,8,9]`. You can access these lists the same way you would access another other element of a list, like this:

``````print (lst)
#output: [1, 2, 3]

print (lst)
#output: [4, 5, 6]

print (lst)
#output: [7, 8, 9]
``````

You can then access the different elements in each of those lists the same way:

``````print (lst)
#output: 1

print (lst)
#output: 2
``````

Here the first number inside the `[]` brackets means get the list in that position. In the above example we used the number `0` to mean get the list in the 0th position which is `[1,2,3]`. The second set of `[]` brackets means get the item in that position from the inner list. In this case we used both `0` and `1` the 0th position in the list we got is the number `1` and in the 1st position it is `2`

You can also set values inside these lists the same way:

``````lst=[10,11,12]
``````

Now the list is `[[10,11,12],[4,5,6],[7,8,9]]`. In this example we changed the whole first list to be a completely new list.

``````lst=15
``````

Now the list is `[[10,11,12],[4,5,15],[7,8,9]]`. In this example we changed a single element inside of one of the inner lists. First we went into the list at position 1 and changed the element within it at position 2, which was 6 now it's 15. PDF - Download Python Language for free