Adding and Removing Items from Dictionaries

Learning Objectives Define what a dictionary is and its key-value pair structure. Explain the purpose of adding new items to a dictionary. Demonstrate how to add a new key-value pair to an existing dictionary. Explain the purpose of removing items from a dictionary. Demonstrate how to remove a key-value pair from a dictionary using its key. Differentiate between adding a new item and updating an existing item in a dictionary. Identify scenarios where dynamically adding or removing dictionary items is useful. Ever wondered how your favorite online store keeps track of all the items in your shopping cart? 🛒 Or how a game remembers your character's inventory? 🤔 In this lesson, you'll learn about dictionaries, a powerful way to organize information using key-value...

TermDefinitionExample DictionaryA collection of key-value pairs, where each unique key is used to look up its associated value. Think of it like a real-world dictionary where words (keys) have definitions (values).A dictionary for a student's grades: `{"Math": 90, "Science": 85}` Key-Value PairThe fundamental unit of a dictionary, consisting of a unique 'key' that acts as an identifier, and its associated 'value' which is the data stored.In `{"item": "apple"}`, 'item' is the key and 'apple' is the value. Adding an ItemThe process of inserting a new key-value pair into a dictionary. If the key already exists, this operation will instead update its value.`my_dict["new_key"] = "new_value"...

Adding or Updating Dictionary Items dictionary_name[key] = value To add a new item, use square brackets with a new key and assign a value. If the key already exists, this syntax will update the value associated with that key instead of adding a new item. Removing Dictionary Items with `del` del dictionary_name[key] The `del` keyword is used to permanently remove a key-value pair from a dictionary. You must provide the exact key of the item you want to remove. If the key does not exist, a `KeyError` will occur. Removing Dictionary Items with `pop()` removed_value = dictionary_name.pop(key, default_value_if_not_found) The `pop()` method removes the specified key-value pair and returns the value that was removed. If the key is not found and no `default_value_if_not_foun...