As a Python learner, it’s crucial to practice and understand how to work with lists effectively. In this article, we will explore various list-related exercises with simple solutions to help you master this essential concept.
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What is a List?
A list in Python is an ordered collection of elements enclosed in square brackets [ ]. Each element in a list can be of any data type, including numbers, strings, or even other lists. Lists are mutable, which means you can change their contents (add, remove, or modify elements) after they are created.
Let’s dive into some practice exercises to solidify your understanding of Python lists.
Exercise 1: Creating a List
Create a list named fruits containing the following fruits: “apple,” “banana,” “cherry,” and “date.”
fruits = ["apple", "banana", "cherry", "date"]
Exercise 2: Accessing List Elements
Access the second element (banana) from the fruits list. You know that Python starts the counting from 0. So second element in Python can be accessed through index 1.
# python lists exercises: Accessing List Elements
fruits = ["apple", "banana", "cherry", "date"]
second_fruit = fruits[1]
print(second_fruit)
bananaExercise 3: Modifying List Elements
Replace “cherry” with “grape” in the fruits list.
# python exercises lists: Modifying List Elements
fruits = ["apple", "banana", "cherry", "date"]
fruits[2] = "grape"
print(fruits)
['apple', 'banana', 'grape', 'date']Exercise 4: Adding Elements to a List
Add “fig” to the end of the fruits list.
# lists in python exercises: Adding Elements to a List
fruits = ["apple", "banana", "cherry", "date"]
fruits.append("fig")
print(fruits)
['apple', 'banana', 'cherry', 'date', 'fig']Exercise 5: Removing Elements from a List
Remove “apple” from the fruits list.
# python lists and strings exercises: Removing Elements from a List
fruits = ["apple", "banana", "cherry", "date"]
fruits.remove("apple")
print(fruits)
['banana', 'cherry', 'date']Exercise 6: Checking if an Element Exists
Check if “date” is in the fruits list.
# python lists and strings exercises: Checking if an Element Exists
fruits = ["apple", "banana", "cherry", "date"]
if "date" in fruits:
print("Date is in the list.")
else:
print("Date is not in the list.")
Date is in the list.Exercise 7: Slicing a List
Create a new list selected_fruits containing the first two elements of the fruits list.
# python lists and strings exercises: Slicing a List
fruits = ["apple", "banana", "cherry", "date"]
selected_fruits = fruits[:2]
print(selected_fruits)
['apple', 'banana']Exercise 8: Reversing a List
Reverse the order of elements in the fruits
# lists in python exercises: Reversing a List
fruits = ["apple", "banana", "cherry", "date"]
# Method:1
fruits.reverse()
print(fruits)
# Method: 2
print(fruits[:])
['date', 'cherry', 'banana', 'apple']
['date', 'cherry', 'banana', 'apple']Exercise 9: Sorting a List
Sort the fruits list in alphabetical order.
# sorted lists function python exercises
fruits = ["apple", "cherry", "banana", "date", "cherry"]
fruits.sort()
print(fruits)
Output of sorted lists Python exercises:
['apple', 'banana', 'cherry', 'cherry', 'date']Exercise 10: Combining Lists
Create a new list more_fruits containing “grape,” “kiwi,” and “melon,” then combine it with the fruits list. This is also called List Concatenation.
# python lists and strings exercises: Combining Lists
fruits = ["apple", "banana", "cherry", "date"]
more_fruits = ["grape", "kiwi", "melon"]
combined_fruits = fruits + more_fruits
print(combined_fruits)
['apple', 'banana', 'cherry', 'date', 'grape', 'kiwi', 'melon']Exercise 11: List Comprehensions
Create a new list even_numbers containing the even numbers from 1 to 10.
# python exercises with for range lists: List Comprehensions
even_numbers = [x for x in range(1, 11) if x % 2 == 0]
print(even_numbers)
[2, 4, 6, 8, 10]Exercise 12: Nested Lists Exercises
Create a nested list called matrix that represents a 2×2 matrix.
# Create Nested List in Python exercises
matrix = [[1, 2], [3, 4]]
print(matrix)
[[1, 2], [3, 4]]Exercise 13: Lists Exercises with For Loop
List Modification exercise in Python: Given a list numbers, double the value of each element in the list, this can be done using for loop.
# python exercises with for range lists
numbers = [2, 4, 6, 8]
doubled_numbers = [x * 2 for x in numbers]
print(doubled_numbers)
[4, 8, 12, 16]Exercise 14: List Filtering
Given a list of numbers, numbers, create a new list even_numbers that contains only the even numbers from the original list.
# List filtering python exercise
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
even_numbers = [x for x in numbers if x % 2 == 0]
print(even_numbers)
[2, 4, 6, 8, 10]Exercise 15: List Filtering with Index
Given a list numbersodd_index_numbers that contains only the elements at odd indices (1st, 3rd, 5th, etc.) of the original list.
# List filtering python exercise
numbers = [10, 20, 30, 40, 50, 60]
odd_index_numbers = [numbers[i] for i in range(len(numbers)) if i % 2 != 0]
print(odd_index_numbers)
[20, 40, 60]Exercise 16: List Splitting
Split a given list my_list into two lists, first_half containing the first half of the elements and second_half containing the second half.
# List spliting python exercise
my_list = [1, 2, 3, 4, 5, 6]
mid_point = len(my_list) // 2
first_half = my_list[:mid_point]
second_half = my_list[mid_point:]
print(first_half)
print(second_half)
[1, 2, 3]
[4, 5, 6]Exercise 17: List Intersection
Given two lists, list1 and list2, create a new list common_elements containing the elements that appear in both lists.
# Python Practice test: List intersection or common element in two list
list1 = [1, 2, 3, 4, 5]
list2 = [3, 4, 5, 6, 7]
common_elements = [x for x in list1 if x in list2]
print(common_elements)
[3, 4, 5]Exercise 18: Flattening a List of Lists
In this Python exercise, given a list of lists nested_list, flatten it into a single list flat_list.
# python list of lists exercises
nested_list = [[1, 2, 3], [4, 5], [6, 7, 8]]
flat_list = [item for sublist in nested_list for item in sublist]
print(flat_list)
[1, 2, 3, 4, 5, 6, 7, 8]Exercise 19: List of Tuples
Create a list of tuples, where each tuple represents a person’s name and age.
# lists and tuples python exercises
people = [("Alice", 30), ("Bob", 25), ("Charlie", 35)]
print(people)
[('Alice', 30), ('Bob', 25), ('Charlie', 35)]Conclusion
These exercises cover various aspects of working with lists in Python programming language, from basic operations like creating and accessing lists to more advanced tasks like sorting and combining lists and flattening list of lists (or nested lists).
Practice these exercises to strengthen your Python programming skills and become more comfortable with lists while appearing for interviews, you can download this as pdf and test it any time.
This is it for this article. If you have any questions or suggestions regarding this article, please please drop a comment below. If you want to learn Python quickly then this Udemy course is for you: Learn Python in 100 days of coding.
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