Ludium - Learn by Doing

Cube the Negatives

Write the function cube_negatives(L). Assume L is a list of integers. The function returns a new list holding the cube of every negative element of L, in the order those elements appear in L. L itself must not be changed.

You may not use a for statement, a while statement, or .append(): build the result with a single list comprehension.

cube_negatives([1, -2, 3, -4])  ->  [-8, -64]
cube_negatives([5, 6])          ->  []
cube_negatives([-1, 0, 1])      ->  [-1]

def cube_negatives(L):
    """Return a new list holding the cube of each negative element of the
    list of integers L, in their original order. L is not modified."""
    pass

def cube_negatives(L):
    """Return a new list holding the cube of each negative element of the
    list of integers L, in their original order. L is not modified."""
    pass

Scratchpad— run any Python to test ideas

# Scratchpad — run any Python here to test ideas.
# Anything you write below stays separate from the problem's tests.

print("hello, world")

# Scratchpad — run any Python here to test ideas.
# Anything you write below stays separate from the problem's tests.

print("hello, world")

Python runtime ready in a moment

Visible tests · 2Examples — click to expand

mixed signs keep only the negatives, cubed

no negative elements gives an empty list

Hidden tests · 3Bodies hidden — pass/fail only

Hidden test 1

Hidden test 2

Hidden test 3

Coding challenges on comprehensions, function objects, and testing

Cube the Negatives

Coding challenges on comprehensions, function objects, and testing

Cube the Negatives