📘 Lesson · Lesson 80

List vs Tuple vs Set vs Dict

The Four Collections

💡 At a Glance

Python has four built-in collection types. Knowing when to use each is a very common interview question.

Comparison Table

Type	Ordered	Changeable	Duplicates	Syntax
List	Yes	Yes	Yes	[1, 2, 3]
Tuple	Yes	No	Yes	(1, 2, 3)
Set	No	Yes	No	{1, 2, 3}
Dict	Yes (3.7+)	Yes	No keys	{"a": 1}

Example

Python

my_list = [1, 2, 2, 3]      # allows duplicates
my_tuple = (1, 2, 3)        # cannot change
my_set = {1, 2, 2, 3}       # removes duplicate -> {1,2,3}
my_dict = {"name": "Aman"}  # key-value pairs
print(my_set)

{1, 2, 3}

Summary

List = ordered, changeable, allows duplicates.
Tuple = ordered, fixed. Set = unordered, unique. Dict = key-value pairs.

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