Python Lambda Functions Practice Questions with Solutions

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Lambda functions are small anonymous functions in Python. They are useful when you need a simple function for a short period of time. In this practice set, you’ll learn how to create lambda functions, pass arguments, use them with built-in functions, and solve beginner-friendly Python programs. Python lambda functions practice questions with solutions help to understand this concepts.

1. Python Program to Create a Simple Lambda Function

Difficulty: Foundation

Problem Statement

Write a Python lambda function to add 10 to a given number.

Python Solution

add_ten = lambda number: number + 10

print(add_ten(15))

Sample Output

25

Explanation

A lambda function is created using the lambda keyword and returns the result automatically.

Concepts Covered

  • lambda keyword
  • Anonymous Function

2. Python Program to Add Two Numbers Using Lambda

Difficulty: Foundation

Problem Statement

Write a Python lambda function to add two numbers.

Python Solution

add = lambda a, b: a + b

print(add(20, 15))

Sample Output

35

Explanation

Lambda functions can accept multiple arguments just like normal functions.

Concepts Covered

  • Lambda Arguments

3. Python Program to Find the Square of a Number Using Lambda

Difficulty: Foundation

Problem Statement

Write a Python lambda function to calculate the square of a number.

Python Solution

square = lambda number: number ** 2

print(square(9))

Sample Output

81

Explanation

The lambda function returns the square of the given number.

Concepts Covered

  • Exponent Operator
  • Lambda Function

4. Python Program to Find the Maximum of Two Numbers Using Lambda

Difficulty: Foundation

Problem Statement

Write a Python lambda function to return the larger of two numbers.

Python Solution

maximum = lambda a, b: a if a > b else b

print(maximum(25, 40))

Sample Output

40

Explanation

The conditional expression selects the greater value.

Concepts Covered

  • Conditional Expression
  • Lambda Function

5. Python Program to Sort a List of Numbers Using Lambda

Difficulty: Practice

Problem Statement

Write a Python program to sort a list in ascending order using a lambda function.

Python Solution

numbers = [45, 12, 78, 23, 9]

numbers.sort(key=lambda number: number)

print(numbers)

Sample Output

[9, 12, 23, 45, 78]

Explanation

The key parameter accepts a lambda function that defines the sorting rule.

Concepts Covered

  • sort()
  • key
  • lambda

6. Python Program to Sort a List of Tuples Using Lambda

Difficulty: Practice

Problem Statement

Write a Python program to sort students by age.

Python Solution

students = [
    ("Amit", 22),
    ("Rahul", 19),
    ("Neha", 21)
]

students.sort(key=lambda student: student[1])

print(students)

Sample Output

[('Rahul', 19), ('Neha', 21), ('Amit', 22)]

Explanation

The lambda function uses the second value (age) as the sorting key.

Concepts Covered

  • List of Tuples
  • Lambda Sorting

7. Python Program to Use Lambda with map()

Difficulty: Practice

Problem Statement

Write a Python program to double every number in a list using map() and a lambda function.

Python Solution

numbers = [2, 4, 6, 8]

result = list(map(lambda number: number * 2, numbers))

print(result)

Sample Output

[4, 8, 12, 16]

Explanation

The map() function applies the lambda function to every element.

Concepts Covered

  • map()
  • Lambda Function

8. Python Program to Use Lambda with filter()

Difficulty: Challenge

Problem Statement

Write a Python program to filter even numbers from a list using filter() and a lambda function.

Python Solution

numbers = [10, 15, 20, 25, 30, 35]

result = list(filter(lambda number: number % 2 == 0, numbers))

print(result)

Sample Output

[10, 20, 30]

Explanation

The filter() function keeps only the elements that satisfy the condition.

Concepts Covered

  • filter()
  • Lambda Function

9. Python Program to Use Lambda with sorted()

Difficulty: Challenge

Problem Statement

Write a Python program to sort words based on their length.

Python Solution

words = ["Python", "AI", "Programming", "Code"]

result = sorted(words, key=lambda word: len(word))

print(result)

Sample Output

['AI', 'Code', 'Python', 'Programming']

Explanation

The sorted() function uses the lambda function to compare word lengths.

Concepts Covered

  • sorted()
  • len()
  • Lambda Function

10. Python Program to Find the Cube of a Number Using Lambda

Difficulty: Challenge

Problem Statement

Write a Python lambda function to calculate the cube of a number.

Python Solution

cube = lambda number: number ** 3

print(cube(5))

Sample Output

125

Explanation

The lambda function returns the cube of the given number using the exponent operator.

Concepts Covered

  • Lambda Function
  • Exponent Operator

Chapter Summary

After completing this chapter, you have learned:

  • Lambda functions
  • Anonymous functions
  • Lambda with arguments
  • Conditional expressions
  • Lambda with sort()
  • Lambda with sorted()
  • Lambda with map()
  • Lambda with filter()
  • Real-world sorting using lambda
  • Writing concise Python functions

Written by Shubhranshu Shekhar, who has trained 20000+ students in coding.

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