This list stores a set of numbers with the person’s first name used as the key. This could be a handy way to quickly grab phone numbers of friends. That is how to add to a dictionary in Python ...

Now you know how to add to a list in Python any time you want to insert ... then you can do so using another tool called a dictionary. But that is a conversation for another time!

Learn how Python's dictionary ... For instance, a list can’t be a key, because elements can be added to or removed from a list. Likewise, a dictionary itself can’t be a key for the same ...