This is about the line
print ('%s renamed to %s.') % (vu, actor.Name())

the correct ways, still Python2-compatible, are:
print ('%s renamed to %s.' % (vu, actor.Name()))
or:
print ('%s renamed to %s.'.format(vu, actor.Name()))

Starting with Python3, the most efficient way is:
print (f'{vu} renamed to {actor.Name()}.')

note the "f" before the string to print, and the fact that your variables and python calls are between {....}
I find this more easy to read, as I precisely know what will appear where.

𝒫𝒽𝓎𝓁

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