# Python Morsel Week One

Posted on Mon 13 July 2020 in morsels

In an attempt to improve my abilities with Python I am starting to do Python Morsels.

The problem statement:

I'd like you to write a function that accepts two lists-of-lists of numbers and returns one list-of-lists with each of the corresponding numbers in the two given lists-of-lists added together. It should work something like this:

```>>> matrix1 = [[1, -2], [-3, 4]]
>>> matrix2 = [[2, -1], [0, -1]]
[[3, -3], [-3, 3]]
>>> matrix1 = [[1, -2, 3], [-4, 5, -6], [7, -8, 9]]
>>> matrix2 = [[1, 1, 0], [1, -2, 3], [-2, 2, -2]]
[[2, -1, 3], [-3, 3, -3], [5, -6, 7]]
```

I wanted to just go through this as I normally would and then try to improve the solution. Here was my first attempt:

```def add(list_of_lists_1, list_of_lists_2):
# given two list of lists [[1,2,3], [4,5,6]] and [[1,1,1], [2,2,2],[3,3,3] add them together
final_list_of_lists = []
if len(list_of_lists_1) == len(list_of_lists_2):
# go add each item of the lists together to create a new list
for index, number_list in enumerate(list_of_lists_1):
if len(final_list_of_lists) <= index:
final_list_of_lists.append([])
number_list_2 = list_of_lists_2[index]
# for each item in the list add them with the same item index of the other list
for i, item in enumerate(number_list):
final_list_of_lists[index].append(
item + number_list_2[i]
)
return final_list_of_lists
```