Recap

Congratulations on successfully navigating through the intricacies of lists, tuples, and dictionaries in Python! You've now mastered a wide array of techniques that are essential for handling various data structures within any programming context. Let's recap the key areas we've covered and the capabilities you've gained:

Lists

Creation and Modification

You learned how to create lists with diverse data types and modify them by adding or removing elements using methods like append(), remove(), and sort().

Access and Manipulation

Through practical examples, you discovered how to access list elements using indexing and manipulate lists to manage grocery store inventories effectively.


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# List operations example: Creating, appending, removing, and sorting
grocery_list = ["milk", "eggs", "butter"]
grocery_list.append("cheese")  # Add an item
grocery_list.remove("eggs")  # Remove an item
grocery_list.sort()  # Sort the list alphabetically
print("Updated Grocery List:", grocery_list)

Tuples

Understanding Immutability

Tuples, unlike lists, are immutable and serve well for storing data that shouldn't change, like product IDs or configurations.

Tuple Operations

You explored how to use tuple operations like the tuple() constructor for converting other iterables into tuples and concatenating tuples to expand data sets securely.


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# Tuple operations example: Creating and using the tuple constructor
seasonal_fruits = ("mango", "watermelon")
new_fruits = ["kiwi", "strawberry"]
all_fruits = seasonal_fruits + tuple(new_fruits)  # Converting list to tuple and concatenating
print("All Fruits:", all_fruits)

Dictionaries

Key-Value Storage

Dictionaries were introduced as versatile structures for quick data retrieval and management, using keys for direct access to associated values.

Dictionary Methods

You learned to utilize dictionary methods such as get(), update(), and pop() to manipulate and maintain up-to-date inventory records effectively.


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# Dictionary methods example: Utilizing get, update, and pop
inventory = {
    "apples": 30,
    "bananas": 45,
    "oranges": 12
}

# Applying of dictionary methods
print("Bananas in stock:", inventory.get("bananas"))  # Using get
inventory.update({"bananas": 50})  # Updating the quantity
removed_item = inventory.pop("oranges")  # Removing an item

# Printing results
print("Updated Inventory:", inventory)
print("Removed Item:", removed_item)

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Seksjon 4. Kapittel 9

Introduction to Python (copy)

Recap

Lists

Creation and Modification

Access and Manipulation

Tuples

Understanding Immutability

Tuple Operations

Dictionaries

Key-Value Storage

Dictionary Methods

1. Which method is used to add an item to the end of a list in Python?

2. What will the following print statement return?

3. How do you get a value from a dictionary without knowing if the key exists, to avoid an error?

4. What will the following print statement return?

5. Which of the following is NOT a valid Python dictionary operation?