Map is a common way to transform lists in most programming languages. In Python, map is a function that loops over a list and applies a function (that you provide) to each item. Your function receives ...

Python has several ways you can add or remove items from a list: .append() inserts an item at the end of the list. For example, list_of_ints.append(4) would turn list_of_ints into the list [1,2,3,4] .

In order to store key-value pairs in Python, you can use the dictionary data structure. The dictionary functions in a similar fashion to the Python list, in that it is a collection of data.