[cctbxbb] Backwards compatibility; Python 2.3?

Graeme.Winter at diamond.ac.uk Graeme.Winter at diamond.ac.uk
Fri Jun 9 13:54:20 PDT 2017

Dear Paul,

For bootstrap I completely appreciate the need for e.g. Python 2.5 or 2.6 compatibility - however does this then necessarily apply to the whole of cctbx and therefore by extension to dials etc. when the very first thing bootstrap does is install Python 2.7?

The root of my question is trying to explain things to our new starter Nick (who initiated this thread) then coming to a halt as I realised I did not understand why some of these peculiarities were present - beyond "historical reasons"

If we were to limit bootstrap.py to Python 2.5 compatibility and subsequently assume everything else is "allowed" 2.7 language level would that cause any problems? It may allow cleanup / removal of things which were from the future when added but are now part of the standard library. Do we even test on a python 2.5 machine?

I'd also like to acknowledge that I appreciate how important these choices are to Phenix, hence trying to understand fully

Hope this makes sense, best wishes Graeme

From: cctbxbb-bounces at phenix-online.org [cctbxbb-bounces at phenix-online.org] on behalf of Paul Adams [pdadams at lbl.gov]
Sent: 09 June 2017 16:58
To: cctbx mailing list
Subject: Re: [cctbxbb] Backwards compatibility; Python 2.3?

Others can correct me, but I believe that we use Python < 2.7 for building Phenix on several platforms because this is what the system Python is (needed to start the bootstrap). We have to support older platforms for compatibility reasons. Unfortunately, end users aren’t as likely to keep their os as up to date as developers would like.

> On Jun 9, 2017, at 5:43 AM, graeme.winter at diamond.ac.uk wrote:
> Folks,
> Does *anyone* actually use Python < 2.7 with CCTBX for anything other than kicking off bootstrap?
> If not, then we could relax this back to using Python 2.7+ (which is a spritely 7 years old already)
> Thanks Graeme
> -----Original Message-----
> From: cctbxbb-bounces at phenix-online.org [mailto:cctbxbb-bounces at phenix-online.org] On Behalf Of Nicholas Devenish
> Sent: 08 June 2017 09:00
> To: cctbx mailing list
> Subject: Re: [cctbxbb] Backwards compatibility; Python 2.3?
> On Wed, Jun 7, 2017 at 12:26 PM, Marcin Wojdyr <wojdyr at gmail.com> wrote:
>> It makes sense to repeat this kind of question from time to time. At
>> some point Python 2.5 won't be needed anymore.
> So, the whole codebase supports 2.5, or just the bootstrapping part?
> As far as I know, bootstrapping (and thus via 2.7) is the only documented way of installing? Are there any opportunities to switch over to bootstrapped python earlier in the process?
> If it is the whole package, are there any automated tests with 2.5?
> (If not, do we know that it's all still 2.5 compatible?)
> Nick
> _______________________________________________
> cctbxbb mailing list
> cctbxbb at phenix-online.org
> http://phenix-online.org/mailman/listinfo/cctbxbb
> --
> This e-mail and any attachments may contain confidential, copyright and or privileged material, and are for the use of the intended addressee only. If you are not the intended addressee or an authorised recipient of the addressee please notify us of receipt by returning the e-mail and do not use, copy, retain, distribute or disclose the information in or attached to the e-mail.
> Any opinions expressed within this e-mail are those of the individual and not necessarily of Diamond Light Source Ltd.
> Diamond Light Source Ltd. cannot guarantee that this e-mail or any attachments are free from viruses and we cannot accept liability for any damage which you may sustain as a result of software viruses which may be transmitted in or with the message.
> Diamond Light Source Limited (company no. 4375679). Registered in England and Wales with its registered office at Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom
> _______________________________________________
> cctbxbb mailing list
> cctbxbb at phenix-online.org
> http://phenix-online.org/mailman/listinfo/cctbxbb

Paul Adams
Division Director, Molecular Biophysics & Integrated Bioimaging, Lawrence Berkeley Lab
Division Deputy for Biosciences, Advanced Light Source, Lawrence Berkeley Lab
Adjunct Professor, Department of Bioengineering, U.C. Berkeley
Vice President for Technology, the Joint BioEnergy Institute
Laboratory Research Manager, ENIGMA Science Focus Area

Building 33, Room 347
Building 80, Room 247
Building 978, Room 4126
Tel: 1-510-486-4225, Fax: 1-510-486-5909

Lawrence Berkeley Laboratory
1 Cyclotron Road
BLDG 33R0345
Berkeley, CA 94720, USA.

Executive Assistant: Louise Benvenue [ LBenvenue at lbl.gov ][ 1-510-495-2506 ]

cctbxbb mailing list
cctbxbb at phenix-online.org

More information about the cctbxbb mailing list