Concatenating strings creates maple copies along the way, as each pair is
concatenated and a new string is return for for the next addition.
This is probably true, but come on. For performance?
This..
for light in all_lights:
light_intensity = cmds.getAttr(light + '.intensity')
..is a lot more readable than this..
for light in all_lights:
light_intensity = cmds.getAttr('{0}.intensity'.format(light))
And that makes it right.
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