[IMPR] Let Python 3 be the default
[IMPR] Let Python 3 be the default

use input instead of raw_input inside the script.
For Python redefine the function to the old raw_input

Change-Id: I35fcd6233214ca8e230ebf1a2e3e508de7f06220

wikimedia/pywikibot-core,wikimedia/pywikibot-core