Replace use of build/bin/sage-python23 by just python3

[mkoeppe]

After the removal of python2 support, this script always calls $SAGE_LOCAL/bin/python3.

This simplification will help with implementing #29013.

CC: @tobiasdiez @dimpase @jhpalmieri

Component: build

Author: Tobias Diez, Matthias Koeppe

Branch/Commit: df2822c

Reviewer: Matthias Koeppe, Tobias Diez, Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/30731

[mkoeppe]

comment:2

#30899 comment:55 explains why replacing it with plain python3 is correct.

[tobiasdiez]

New commits:

218fe09	Use system python for generation of conway_polynomials and elliptic_curves
9f15544	Use python3 instead of system-python

[tobiasdiez]

Branch: public/build/sharedSystemPython

[tobiasdiez]

Commit: 9f15544

[tobiasdiez]

Author: Tobias Diez, ...

[sagetrac-git]

Changed commit from 9f15544 to 7cb43a5

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

f7323ee	Merge branch 'develop' of git://github.com/sagemath/sage into public/build/sharedSystemPython
7cb43a5	Remove other instances of sage-python23

[tobiasdiez]

Changed author from Tobias Diez, ... to Tobias Diez

[tobiasdiez]

comment:6

I've now replaced all instances of sage-python23, and deleted the script itself. Ready for review.

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

df2822c

Update documentation regarding use of python3 vs. sage-bootstrap-python

[sagetrac-git]

Changed commit from 7cb43a5 to df2822c

[mkoeppe]

Changed author from Tobias Diez to Tobias Diez, Matthias Koeppe

[mkoeppe]

comment:8

I've revised the documentation a bit.

[tobiasdiez]

Reviewer: Tobias Diez, ...