Re: [cctbxbb] Backwards compatibility; Python 2.3?

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: [email protected] [[email protected]] on behalf of Paul Adams [[email protected]] 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, [email protected] 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: [email protected] [mailto:[email protected]] 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 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 [email protected] http://phenix-online.org/mailman/listinfo/cctbxbb

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-- 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 http://cci.lbl.gov/paul Lawrence Berkeley Laboratory 1 Cyclotron Road BLDG 33R0345 Berkeley, CA 94720, USA. Executive Assistant: Louise Benvenue [ [email protected] ][ 1-510-495-2506 ] -- _______________________________________________ cctbxbb mailing list [email protected] http://phenix-online.org/mailman/listinfo/cctbxbb