Mix of numbers
Input
[1, 2, 3, 4, 0, -2]
Output
[4, 16, 0, 4]
Evens are 2,4,0,-2. Their squares are 4,16,0,4 in the same order.
Full lesson preview
Chain map and filter to square even numbers
Filter even numbers and then square them by chaining filter and map with lambdas.
Python practice15 minFunctions as Objects (Lambda, Map/Filter)IntermediateLast updated March 20, 2026
Problem statement
Create a function square_even_numbers(numbers) that accepts an iterable of integers and returns a list of the squares of the even numbers, preserving the original order. Implement this by first using filter(...) with a lambda to keep even numbers, then using map(...) with a lambda to square them, and finally converting the result to a list.
Task
Combine filter and map with lambda functions to process a sequence: select evens then transform them.
Examples
Input format
A single argument: an iterable (e.g., list or tuple) of integers.
Output format
A list of integers (squares of even inputs) in the same relative order as the even numbers in the input.
Constraints
Use filter(...) and map(...) with lambda expressions. Preserve order. The function should accept any iterable, not just lists.
Samples
Sample 1
Input
[1,3,5,7]
Output
[]
No even numbers, so result is an empty list.