Comprehensions & generators

def transform_data(data):
    """
    Transform a list of integers:
    - squares of even numbers using a list comprehension
    - cubes of odd numbers using a generator
    """
    squares = [num ** 2 for num in data if num % 2 == 0]
    cubes = (num ** 3 for num in data if num % 2 != 0)
    return squares, cubes


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