Python Data Structures

Python Data Structures

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1. List

What is a list? A list is an ordered collection that can be modified. It also allows for duplicate elements.

Creating a List

Challenge: Create a List

Lists Are Mutable

Append() Method

Insert() Method

Deleting Elements

Removing Elements

List Comprehensions

2. Dictionary

What is a dictionary? A dictionary is an ordered collection that can be changed, but it doesn't allow duplicate entries. It consists of `key:value` pairs, which are used to optimize its structure.

Creating a Dictionary

Challenge: Craft the Dictionary

Extraction of Information

Popitem() Method

Dictionary Comprehensions

3. Tuple

What is a tuple? A tuple is an ordered collection that cannot be altered. It can have duplicate elements. While it's similar to a list, the values in a tuple can be of any type and are indexed by integers. Although not mandatory, it's common to enclose the values of a tuple in parentheses, making them easier to understand in Python.

Creating a Tuple

Accessing Elements of a Tuple

Concatenation of Tuples

Challenge: Concatenate Tuples

4. Set

What is a set? In Python, a `set` is an unordered collection that is both `iterable` and `mutable`, with no repeated elements. While the order of items in a set isn't fixed, it can include a variety of elements. A key benefit of using sets over lists is their highly efficient method for determining if an element exists within the set.

Update() Method

Accessing the Elements of a Set

Remove() and Discard() Methods

Removing Elements

Imagine you have this list:

You can also remove an item from the list by specifying its value. Here's how to do that.

Now, the list is down to two items instead of three:

tasks[0] reads 'email Ann';
tasks[1] reads 'meet with classmates'.

Note
With the remove() method, you can only take out one item at a time.

Task

You've got this list:

numbers = [10, 12, 14, 16, 18, 20]

Your goal is to end up with:

numbers = [12, 14, 16]

Everything was clear?

Section 1. Chapter 10

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Removing Elements

Imagine you have this list:

You can also remove an item from the list by specifying its value. Here's how to do that.

Now, the list is down to two items instead of three:

tasks[0] reads 'email Ann';
tasks[1] reads 'meet with classmates'.

Note
With the remove() method, you can only take out one item at a time.

Task

You've got this list:

numbers = [10, 12, 14, 16, 18, 20]

Your goal is to end up with:

numbers = [12, 14, 16]

Everything was clear?

Section 1. Chapter 10

toggle bottom row

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