modify list element with list comprehension in python

Question

folks,

I want to modify list element with list comprehension. For example, if the element is negative, add 4 to it.

Thus the list

a = [1, -2 ,          


        

Answer 1

This version is older, it would work on Python 2.4

>>> [x < 0 and x + 4 or x for x in [1, -2, 2]]
0: [1, 2, 2]

For newer versions of Python use conditional expressions as in Adam Wagner or BenH answers