Use system python for generation of conway_polynomials and elliptic_curves

[tobiasdiez]

Instead of sage's python, the installation of conway_polynomials and elliptic_curves now uses the system python. This enables one to call make conway_polynomials without a prior compilation of python (which is helpful for #30371). Since the installation of these packages uses python only to convert files into the right format, using the system python should be fine.

Depends on #30731

CC: @mkoeppe

Component: build

Reviewer: Tobias Diez

Issue created by migration from https://trac.sagemath.org/ticket/30934

[mkoeppe]

comment:2

These packages declare $(PYTHON) as a dependency, so they are allowed to use Sage's python.

sage-system-python is not the correct choice here. It can be a wide range of Python versions (including 2.x), and certainly existence of the sqlite module in that python, as required in build/pkgs/elliptic_curves/spkg-install.py, is not guaranteed.
(Note #30627 renames this script to sage-bootstrap-python.)

[tobiasdiez]

comment:3

Thanks for the feedback. So what is the correct choice if the user does have a suitable system python?

[mkoeppe]

comment:4

When there is a suitable system python3, then Sage creates a venv over it, so python3 works. When there is no suitable system python3, then Sage builds one, so python3 also works.

[sagetrac-git]

Changed commit from 218fe09 to 9f15544

[sagetrac-git]

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

9f15544

Use python3 instead of system-python

[tobiasdiez]

comment:6

Replying to @mkoeppe:

When there is a suitable system python3, then Sage creates a venv over it, so python3 works. When there is no suitable system python3, then Sage builds one, so python3 also works.

Thanks! I've now used python3 and it works indeed in the context of #30371.

[mkoeppe]

comment:8

This change should not be done for one package but uniformly for all packages - in #30731.
You can push the branch from here to that ticket to get it started.

[mkoeppe]

Dependencies: #30731

[tobiasdiez]

comment:9

Ok, then close this ticket here, although I don't really see why #30731 could't build upon this ticket.

[mkoeppe]

comment:10

Because this ticket on its own makes the codebase less uniform.

[mkoeppe]

Reviewer: Tobias Diez

[mkoeppe]

Changed author from Tobias Diez to none

[sagetrac-git]

Changed commit from 9f15544 to 7cb43a5

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1 and set ticket back to needs_review. New commits:

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

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1 and set ticket back to needs_review. New commits:

df2822c

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

[sagetrac-git]

Changed commit from 7cb43a5 to df2822c

[mkoeppe]

Changed commit from df2822c to none

[mkoeppe]

Changed branch from public/build/sharedSystemPython to none