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

Accessing the Elements of a Set

Since a set is an unordered collection, you can't access its elements by index because they don't have indices. However, you can verify whether an element exists within the set using the in keyword.

It's especially handy to use the in keyword with a for loop. Let's check out an example.

Task

Here's your set:

You need to determine if "pear", "banana", and "lemon" are in the set.

Everything was clear?

Section 4. Chapter 4

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Accessing the Elements of a Set

Since a set is an unordered collection, you can't access its elements by index because they don't have indices. However, you can verify whether an element exists within the set using the in keyword.

It's especially handy to use the in keyword with a for loop. Let's check out an example.

Task

Here's your set:

You need to determine if "pear", "banana", and "lemon" are in the set.

Everything was clear?

Section 4. Chapter 4

toggle bottom row

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