[keedon]

  for n in [i for i in range(100) if i%2 == 0]:
    print n

Will work (if a bit repetitive looking)

[BerislavLopac]

It's not just repetitive; this particular example actually creates a list before starting the external loop -- imagine it with range(100000000) or something. It is better if you replace [] with (), which creates a generator.

[Herald_MJ]

`range()` also takes an optional `step` argument which would help here.