Remove list from list in Python

Possible Duplicate:
Get difference from two lists in Python

What is a simplified way of doing this? I have been trying on my own, and I can’t figure it out. list a and list b, the new list should have items that are only in list a. So:

a = apple, carrot, lemon
b = pineapple, apple, tomato
new_list = carrot, lemon

I tried writing code, but every time it always returns the whole list a to me.

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