Topic: Lists
Difficulty: Intermediate

Problem

Write a solution for Lists Exercise #20:

Implement a function solve_lists_20(data) that processes the input according to lists concepts from the curriculum.

Example input: data = [lists_example_20]
Expected: A transformed result demonstrating lists skills.

Constraints

  • Use idiomatic Python 3.10+
  • Handle empty input gracefully
  • Do not mutate input unless specified

Hint

Hint

Review Lists exercises and the related chapter in the Learning Path. Consider edge cases: empty collections, None, zero, negative numbers.

Test Yourself 

  # Write tests before implementing
assert solve_lists_20([]) is not None  # define expected behavior

Next exercise: Lists Exercise #21