DEV Community

Syed Sadat Ali
Syed Sadat Ali

Posted on

2

Four data structures in Python

Four data structures in Python

  • List:

    • Mutable: You can change, add, or remove items after the list creation.
    • Ordered: The order of items is maintained, and items can be accessed by their index.
    • Syntax: Created using square brackets [] or the list() function.
    • Duplicates: Allows duplicate elements.
      • Example: [1, 2, 3, 'apple', 'banana']
  • Tuple:

    • Immutable: Once created, you cannot change, add, or remove items.
    • Ordered: Like lists, the order is maintained, and index access is possible.
    • Syntax: Created using parentheses () or the tuple() function.
    • Duplicates: Allows duplicate elements.
      • Example: (1, 2, 3, 'apple', 'banana')
  • Set:

    • Mutable: You can add or remove items, but you cannot change individual items.
    • Unordered: No index access because sets do not record element position.
    • Syntax: Created using curly braces {} or the set() function.
    • Duplicates: Does not allow duplicate elements; only unique items.
      • Example: {1, 2, 3, 'apple', 'banana'}
  • Dictionary:

    • Mutable: You can change, add, or remove items, which are key-value pairs.
    • Ordered: As of Python 3.7, dictionaries maintain insertion order.
    • Syntax: Created using curly braces {} with key-value pairs or the dict() function.
    • Duplicates: Keys must be unique, but values can be duplicated.
      • Example: {1: 'apple', 2: 'banana', 3: 'cherry'}

Quick summary in code:

# List: Mutable, ordered, allows duplicates
my_list = [1, 2, 2, 'apple']

# Tuple: Immutable, ordered, allows duplicates
my_tuple = (1, 2, 2, 'apple')

# Set: Mutable, unordered, no duplicates
my_set = {1, 2, 'apple'}

# Dictionary: Mutable, ordered (since Python 3.7), unique keys
my_dict = {1: 'apple', 2: 'banana', 3: 'apple'}
Enter fullscreen mode Exit fullscreen mode

Each structure has its own use-cases depending on the requirements of mutability, order, and uniqueness in your Python program.

Sentry image

Hands-on debugging session: instrument, monitor, and fix

Join Lazar for a hands-on session where you’ll build it, break it, debug it, and fix it. You’ll set up Sentry, track errors, use Session Replay and Tracing, and leverage some good ol’ AI to find and fix issues fast.

RSVP here →

Top comments (1)

Collapse
 
engrsakib profile image
Md Nazmus Sakib

very attractive

Billboard image

The Next Generation Developer Platform

Coherence is the first Platform-as-a-Service you can control. Unlike "black-box" platforms that are opinionated about the infra you can deploy, Coherence is powered by CNC, the open-source IaC framework, which offers limitless customization.

Learn more

👋 Kindness is contagious

Please leave a ❤️ or a friendly comment on this post if you found it helpful!

Okay