# 10 Python Lambda Functions Exercises and Examples

Lambda functions are small functions that are restricted to a single expression in Python. These are also known as anonymous functions and are declared with no function name. This makes them useful in places where you need a small, one-off function that you won’t reuse elsewhere in your code.

In this post, I’ll share some examples and exercises that will help you understand lambda functions in Python better. Let’s dive right in.

## 1. A simple lambda function

``````square = lambda x: x ** 2
print(square(5))``````

Output:

## 2. Lambda function with multiple arguments

``````multiply = lambda x, y: x * y
print(multiply(3, 7))``````

Output:

## 3. Using a lambda function inside another function

``````def my_func(n):
return lambda x: x * n

doubler = my_func(2)
print(doubler(5))``````

Output:

## 4. Using lambda with Python built-in functions

``````my_list = [1, 2, 3, 4, 5, 6]
odd_numbers = list(filter(lambda x: x % 2 != 0, my_list))
print(odd_numbers)``````

Output:

## 5. Using lambda function for sorting

``````my_list = [("apple", 50), ("banana", 10), ("cherry", 30)]
sorted_list = sorted(my_list, key=lambda x: x[1])
print(sorted_list)``````

Output:

## 6. Using a lambda function to return a function

``````def my_func(n):
return lambda x: x + n

Output:

## 7. Using a lambda function in list comprehension

``````my_list = [1, 2, 3, 4, 5, 6]
new_list = [(lambda x: x ** 2)(x) for x in my_list]
print(new_list)``````

Output:

## 8. Using a lambda function to sort a list of strings by the last character

``````my_list = ["apple", "banana", "cherry"]
sorted_list = sorted(my_list, key=lambda x: x[-1])
print(sorted_list)``````

Output:

## 9. Using a lambda function with the reduce function

``````from functools import reduce

my_list = [1, 2, 3, 4, 5]
product = reduce((lambda x, y: x * y), my_list)
print(product)``````

Output:

## 10. Using a lambda function with the `map` function

``````my_list = [1, 2, 3, 4, 5]
new_list = list(map(lambda x: x ** 2, my_list))
print(new_list)``````

Output:

I hope these exercises and examples give you a better understanding of lambda functions in Python. Check out my post on 15 Python Object-Oriented Programming (OOP) Exercises.

Ashwin Joy

I'm the face behind Pythonista Planet. I learned my first programming language back in 2015. Ever since then, I've been learning programming and immersing myself in technology. On this site, I share everything that I've learned about computer programming.