Lists
Instead of creating separate variables for many values, you can use a list to store them all together.
In Python, a list is an ordered and flexible structure built into the language. It's one of the most commonly used data types for grouping multiple values.
- How do you define a list in Python? Give code example.
- How do you access items in a list using indexes? Give code example.
- How do you add, remove or update items from a list in Python? Give code example.
Creating a List
Lists are defined with square brackets, separating items by commas: [1, 2, 3].
They can be empty [], hold strings like ["apple", "banana"], or even mix types [42, "hello", True].
Lists are useful for data that may grow, change, or be processed with loops.
Accessing Items
List elements are accessed by index, starting at 0.
For example, fruits[0] is "apple", and fruits[1] is "banana".
Negative indexes count from the end: fruits[-1] is "cherry", and fruits[-2] is "banana".
Modifying Lists
Lists are flexible because you can change them after creation.
- Update by index:
cart[0] = "mango"; - Add with
.append():cart.append("orange"); - Remove last item with
.pop(), or a specific one with.remove("apple").
This makes lists useful for dynamic data.
Summary
- Lists are used to store multiple values — all in one variable;
- You can access each item by its index — and also update, add, or remove items;
- Lists are great for dynamic data — like queues, collections, and search results;
- They are flexible, readable, and essential for many real-world tasks in Python.
Try It Yourself
- Make a list of five book titles;
- Print the first and last title;
- Then append a new book to the end of the list, and remove the second book using its index;
- Print the final list to see how it changed.
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Can you show me an example of creating and modifying a list in Python?
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Can you explain more about negative indexing in lists?
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Instead of creating separate variables for many values, you can use a list to store them all together.
In Python, a list is an ordered and flexible structure built into the language. It's one of the most commonly used data types for grouping multiple values.
- How do you define a list in Python? Give code example.
- How do you access items in a list using indexes? Give code example.
- How do you add, remove or update items from a list in Python? Give code example.
Creating a List
Lists are defined with square brackets, separating items by commas: [1, 2, 3].
They can be empty [], hold strings like ["apple", "banana"], or even mix types [42, "hello", True].
Lists are useful for data that may grow, change, or be processed with loops.
Accessing Items
List elements are accessed by index, starting at 0.
For example, fruits[0] is "apple", and fruits[1] is "banana".
Negative indexes count from the end: fruits[-1] is "cherry", and fruits[-2] is "banana".
Modifying Lists
Lists are flexible because you can change them after creation.
- Update by index:
cart[0] = "mango"; - Add with
.append():cart.append("orange"); - Remove last item with
.pop(), or a specific one with.remove("apple").
This makes lists useful for dynamic data.
Summary
- Lists are used to store multiple values — all in one variable;
- You can access each item by its index — and also update, add, or remove items;
- Lists are great for dynamic data — like queues, collections, and search results;
- They are flexible, readable, and essential for many real-world tasks in Python.
Try It Yourself
- Make a list of five book titles;
- Print the first and last title;
- Then append a new book to the end of the list, and remove the second book using its index;
- Print the final list to see how it changed.
Grazie per i tuoi commenti!
