# 6. Now you try! - Cubes by four isn't a list?

<Below this line, add a link to the EXACT exercise that you are stuck at.>

<In what way does your code behave incorrectly? Include ALL error messages.>
After typing in the code (below) I get an error reading “It looks like cubes_by_four isn’t a list” but I can’t figure out what’s wrong with my code? All help previously posted on this forum is the same as what I typed in but mine won’t work?

<What do you expect to happen instead?>
I thought the code was fine, It should return a list of cubed numbers (between 1 and 10) that are also divisible by four.

```python

def cubes_by_four(x):
cubes_by_four = [x3 for x in range(1,11) if (x3) % 4 == 0]
print cubes_by_four

``<do not remove the three backticks above>``

You were told to use list_comprehension, List comprehension does not require a function,

``````def cubes_by_four(x):
cubes_by_four = [x**3 for x in range(1,11) if (x**3) % 4 == 0]
print cubes_by_four
``````

All you need to do is remove this line,

5 Likes

Good lord… I feel silly. The defined function was there already so I just left it and didn’t really take it into consideration! Thanks so much!

2 Likes

You’re welcome

I didn’t get why you put the x**3 can you explain? I didn’t really understand it

I didn’t get that either

x**3 = x cubed. the question asks you to cube it.

I know that x3 = x cubed
But why "x
3" why not for intence “x**2”

[x3 for x in range(1,11) if (x3) % 4 == 0]

x**2 is x squared. You are not answering the question.

The challenged posed was:

"Instructions

1. Use a list comprehension to create a list, cubes_by_four.
2)The comprehension should consist of the cubes of the numbers 1 through 10 only if the cube is evenly divisible by four.
3)Finally, print that list to the console.
Note that in this case, the cubed number should be evenly divisible by 4, not the original number."

As you can see, the question asks for cubes of the numbers in the list to be printed if divisible by four. If the question asked fr squares of the numbers then x**2 would be fine.

This topic was automatically closed 7 days after the last reply. New replies are no longer allowed.