On Friday, May 26, 2017 at 7:52:57 AM UTC-7, John H Palmieri wrote:
>
> If you build Sage's IPython package with SAGE_PYTHON3=yes, then it will 
> install a script local/bin/ipython3. (Note then that if the sage-location 
> script runs, its function make_scripts_relative will break 
> local/bin/ipython3 because it will replace the #! line, which initially 
> uses Sage's Python3, to a generic /usr/bin/env python. Another broken part 
> to fix.)
>

Ah, that would explain it. Data point on naming: on my fedora25, there are 
/usr/bin/ipython, /usr/bin/ipython2, /usr/bin/python3 (each separate 
files). ipython and ipython3 are identical. The ipython2 might be a 
historical remnant, though.

For Python, there are /usr/bin/python2.7, /usr/bin/python3.5 with 
/usr/bin/python a symlink pointing to /usr/bin/python2.7 (via some other 
symlinks). 

So there seems to be precedent that the naming convention for "python" does 
not translate to naming convention for "ipython".

In any case, I think it would be good to ensure we at least have 
functioning *python2* and *python3* links. What the unnumbered names refer 
to is then slightly less vital.

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