Скачать или смотреть 12.Coding part of list , tuple , set and dict

🔹 1. List

A list is an ordered, changeable (mutable) collection of items.
You can add, remove, or modify items.

✅ Key Features

Ordered

Mutable (can change)

Allows duplicate values

Index-based access

📌 Example
my_list = [10, 20, 30, 40]
print(my_list[2]) # 30
my_list.append(50)
print(my_list) # [10, 20, 30, 40, 50]

🎯 Use When

You need a dynamic, changeable collection of items.

🔹 2. Tuple

A tuple is like a list but immutable (cannot change after creation).

✅ Key Features

Ordered

Immutable

Allows duplicates

Faster than list

📌 Example
my_tuple = (10, 20, 30, 40)
print(my_tuple[1]) # 20
my_tuple[1] = 50 # ❌ Error: Tuples cannot be changed

🎯 Use When

You want data that should not change (e.g., constants, fixed data).

🔹 3. Set

A set is an unordered, unique collection of items.

✅ Key Features

Unordered

Mutable

No duplicate values

No indexing

📌 Example
my_set = {10, 20, 20, 30}
print(my_set) # {10, 20, 30} (duplicates removed)

my_set.add(40)
print(my_set)

🎯 Use When

You need unique values or want to perform mathematical operations like
union, intersection, difference.

🔹 4. Dictionary (dict)

A dict stores data in key–value pairs.

✅ Key Features

Unordered (in Python 3.7+, maintains insertion order)

Mutable

Keys must be unique

Fast lookup using keys

📌 Example
my_dict = {"name": "Sanjay", "course": "SQL", "age": 22}

print(my_dict["name"]) # Sanjay
my_dict["age"] = 23
print(my_dict)

🎯 Use When

You need to map values to keys for fast lookup (e.g., student data, configs).

🔥 Quick Comparison Table
Feature List Tuple Set Dict
Ordered ✔️ ✔️ ❌ ✔️*
Mutable ✔️ ❌ ✔️ ✔️
Allows Duplicates ✔️ ✔️ ❌ Keys❌, Values✔️
Indexed ✔️ ✔️ ❌ Key-based
Unique Items ❌ ❌ ✔️ Keys✔️