More complicated terms can be calculated within list comprehension as well:
>>> x = [2, 4, 6, 8]
>>> y = [3, 0, -5, 1]
>>> [x[i] + y[i] for i in range(4)]
[5, 4, 1, 9]
A list comprehension can consist of an arbitrary number of for/in's. These can be viewed as nested for loops:
>>> first = ["lust", "merci", "fanci", "art", "power", "voice"]
>>> last = ["less", "ful"]
>>> [ f + l for f in first for l in last ]
['lustless', 'lustful', 'merciless', 'merciful', 'fanciless', 'fanciful', 'artless', 'artful', 'powerless', 'powerful', 'voiceless', 'voiceful']