This content originally appeared on DEV Community and was authored by Syed Sadat Ali

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'}

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

This content originally appeared on DEV Community and was authored by Syed Sadat Ali

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Four data structures in Python

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