Sage Days 3000: porting Sage to Python 3

9 July 2018 ­– 13 July 2018

Ghent University (Gent, Belgium)

(or rather postponed to some ulterior dates)

Goal

This is a small-scale workshop for Sage developers with a specific focus on porting Sage to Python 3. While a lot of effort has been done for this, we hope that this workshop will accelerate this.

Organizer

• Jeroen Demeyer (Ghent University)

Participants

• Frédéric Chapoton (CNRS & Université de Strasbourg)

• Jeroen Demeyer (Ghent University)

Funding

For participants without travel grants, the OpenDreamKit project has some money available.

Some specific tasks

1. ensure that "make doc" works : see patchbot reports with python3 on ticket 0 (https://patchbot.sagemath.org/ticket/0/)

1. Make sure that the pdf documentation builds correctly: https://trac.sagemath.org/ticket/25840, upgrade sagenb, fix src/sage/combinat/root_system/plot.py

2. update some packages

   1. ✓ update pynac : https://trac.sagemath.org/ticket/24838 ; https://trac.sagemath.org/ticket/24751 ; https://trac.sagemath.org/ticket/24752

   2. update sagenb :

      1. ✓ https://github.com/sagemath/sagenb/pull/446

      2. ✓ https://github.com/sagemath/sagenb/pull/449

      3. ✓ https://github.com/sagemath/sagenb/pull/450

      4. https://github.com/sagemath/sagenb/issues/454

   3. update brial : https://trac.sagemath.org/ticket/24786

3. make all doctests pass

   1. ✓ fix doctests in plot/plot.py : https://trac.sagemath.org/ticket/25579/

   2. fix doctests in src/sage/combinat/root_system/plot.py (involves https://trac.sagemath.org/ticket/25677 ; https://trac.sagemath.org/ticket/25724)

   3. ✓ fix pickling : https://trac.sagemath.org/ticket/24582/

   4. fix all doctests in parent and element : one step in https://trac.sagemath.org/ticket/25824/

   5. fix all doctests of some touchstone files (for example src/sage/schemes/elliptic_curves/ell_rational_field.py)
   6. fix all doctests of some core files (for example src/sage/rings/integer_ring.pyx)

2. monitor the progress

1. estimate how many files still have doctest failures (around 40000 ?)
2. tools to check for progress and prevent regression

3. enhance the patchbot "pyflakes" plugin : https://github.com/sagemath/sage-patchbot/issues/128

4. patchbot doctests on sage3 (beware HUGE FILE ~ 90 Mb) : https://patchbot.sagemath.org/log/0/Ubuntu/18.04/x86_64/4.15.0-20-generic/petitbonum/2018-06-15%2012:41:41?short