Hi just a quick one.

Why is it necessary to use .format():

for light in all_lights:
    light_intensity = cmds.getAttr('{0}.intensity'.format(light))

rather than:

for light in all_lights:
    light_intensity = cmds.getAttr(light + '.intensity')

they both work but i always see people using the .format() method, rather than 
just concatenating the strings. Is there a reason to use one rather than the 
other. The latter seems simpler also

thanks, 
Sam

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