Using Lists and Dictionaries Together

Learning Objectives Model a collection of complex objects, like a list of users or products, using a list of dictionaries. Access specific data by chaining index and key lookups (e.g., `my_list[0]['name']`). Iterate through a list of dictionaries to display or process information for each item. Create a dictionary where one or more values are lists (e.g., a user profile with a list of friends). Add new dictionaries to an existing list. Modify a value within a dictionary that is stored inside a list. Ever wonder how your phone stores a list of contacts, where each contact has a name, a phone number, AND an email address? 📱 Let's find out how two powerful data structures team up to make it happen! In this lesson, you'll learn how to combine lists and dict...

TermDefinitionExample ListAn ordered, changeable collection of items. You access items by their numerical position (index), starting from 0.`my_pets = ["dog", "cat", "fish"]` DictionaryAn unordered collection of key-value pairs. You access a value by its unique key, not by a position.`my_pet = {"name": "Fido", "type": "dog"}` Nested Data StructureA data structure that contains another data structure inside it. For example, a list that contains dictionaries, or a dictionary that contains a list.`users = [ {"name": "Alice"}, {"name": "Bob"} ]` is a list of dictionaries. List of DictionariesA common pattern where a list is used to hold a sequence of dictionaries, with each dictionary...

Accessing a Dictionary in a List `list_name[index]['key']` Use this pattern to get a specific value from a dictionary that is inside a list. First, use the square brackets `[index]` to select the dictionary from the list. Then, immediately use `['key']` to get the value associated with that key from the selected dictionary. Accessing an Item in a List within a Dictionary `dictionary_name['key'][index]` Use this pattern when a dictionary's value is a list. First, use `['key']` to access the list. Then, immediately use `[index]` to select the specific item from that list. Looping Through a List of Dictionaries `for item in list_of_dictionaries:` `print(item['key'])` To process every item in a list of dictionaries...