Small code refactoring, no functional change + extra lines between funct...

...ions ala pep8

Hey Pablo, I thought it wouldn't hurt to give it a go at code-reviewing your script :)
By the way, apart from the list.find() function, the other functionality you may want to use in the future is enumerate(). In this case it would be:

for i, scene in bpy.data.scenes:
    print("scene {0} has id {1}".format(scene, i)

Cheers