Learn Dictionary Methods | Other Data Types

Dictionary Methods

Dictionaries provide a range of operations and methods that facilitate efficient data handling. Here are some of the most commonly used methods:

get(): retrieves the value for a specified key, and if the key is not found, it returns None. This is different from using square brackets (e.g., grocery_items["Milk"]), which would raise an error if the key doesn't exist.;
update(): updates the dictionary with elements from another dictionary or an iterable of key-value pairs, overwriting existing keys;
pop(): removes a specified key and returns the corresponding value.

Note

In Python, None is a special value that means "nothing" or "no value", and it's often used when you want to show that something is empty or doesn't have a result.

Example Application

Imagine you need to update the dictionary for an inventory in your grocery store. Here's how you can do it using dictionary methods:


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# Dictionary for a grocery store inventory
inventory = {
    "Apples": 30,
    "Oranges": 18,
    "Bananas": 45
}

# Get the count of Oranges
print("Count of Oranges:", inventory.get("Oranges"))

# Update inventory by adding a new item
inventory.update({"Mangoes": 20})
print("Updated Inventory:", inventory)

# You can also add a new item to the end of the dictionary like this
inventory["Pineapples"] = 15
print("Updated Inventory:", inventory)

# Remove Bananas from the inventory
removed_item = inventory.pop("Bananas")
print("Removed Item:", removed_item)
print("Current Inventory:", inventory)

Task

Swipe to start coding

Practice managing a grocery store inventory using a dictionary.

Create a dictionary called grocery_inventory with these items:
- Milk: (113, "Dairy")
- Eggs: (116, "Dairy")
- Bread: (117, "Bakery")
- Apples: (141, "Produce")
Get the details for "Bread" and save them in a variable called bread_details.
Add a new item "Cookies" with details (143, "Bakery").
Remove the item "Eggs" from the dictionary.

Print the following after each step:

The details of Bread: Details of Bread: <$bread_details>
The inventory after adding Cookies: Inventory after adding Cookies: <$grocery_inventory>
The inventory after removing Eggs: Inventory after removing Eggs: <$grocery_inventory>

Solution

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Section 4. Chapter 10

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