Lists in Python

A list is a collection of items stored in a single variable. Lists are ordered, mutable, and allow duplicate values.

💡 Lists are created using square brackets [ ].

Creating a List

numbers = [1, 2, 3, 4, 5]
names = ["Khushi", "Python", "Learner"]
mixed = [10, "Hello", True]

print(numbers)
print(names)
print(mixed)

Accessing List Elements

List elements are accessed using index numbers (starting from 0). 

fruits = ["apple", "banana", "cherry"]

print(fruits[0])
print(fruits[1])
print(fruits[-1])

Modifying Lists

Lists are mutable, meaning you can change their values. 

fruits = ["apple", "banana", "cherry"]
fruits[1] = "mango"
print(fruits)

Common List Methods

numbers = [1, 2, 3]

numbers.append(4)
numbers.insert(1, 10)
numbers.remove(2)
numbers.pop()

print(numbers)

Looping Through a List

fruits = ["apple", "banana", "cherry"]

for fruit in fruits:
    print(fruit)

Common Mistakes

❌ Accessing index that doesn’t exist
❌ Forgetting list indices start from 0
❌ Confusing append() with insert()

Practice Exercises

  1. Create a list of 5 numbers
  2. Print the first and last elements
  3. Add a new number and remove one
Next → Tuples