Running Python 2 and Python 3 on the same machine

[Terry Reedy]

Martin v. Löwis wrote:
>> Since the source code is incompatible, I was expecting the Python
>> executable to have a new name such as 'python3'
> 
> It does: the executable is called python3.0.

Why do you say that?  As I reported on the py3 list when requesting a 
new name -- in particular, python3, the new python is installed on WinXP 
as python.exe and pythonw.exe!!!  The includes the new 3.0 release.