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Re:Release of IPython 5.0 by rbanffy on Saturday July 09, 2016 @08:43AM (#12061126)
Many people use Python 2 for the sole reason it's the default system Python. I assume a lot of them will instantaneously move to Python 3 the moment typing "python" on the command line will invoke the Python 3 REPL.

All my python 2 only code explicitly invokes python 2 on the shebang line.

Re:Release of IPython 5.0 by collinmanderson on Monday July 11, 2016 @09:37AM (#12070925)
Though, more likely they'll find that typing "python" returns "command not found", and in that case they might find it easier to just type apt-get/dnf install python.