Using python to return a list of squared integers

I'm looking to write a function that takes the integers within a list, such as [1, 2, 3], and returns a new list with the squared integers; [1, 4, 9]

How would I go about this?

PS - just before I was about to hit submit I noticed Chapter 14 of O'Reilly's 'Learning Python' seems to provide the explanation I'm looking for (Pg. 358, 4th Edition)

But I'm still curious to see what other solutions are possible