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Astropy and the Open Source Revolutiˑn in Astronomy Tom Robitaille (@astrofrog) MPIA | The Astropy Project

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What does “Open Source” really mean?

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Open Closed

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Open Binaries :’( Examples: Keynote, PowerPoint, etc. Closed

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Open Source Code :| No license does not mean free/open source! Examples: Supermongo, any unlicensed code, etc. Binaries :’( Examples: Keynote, PowerPoint, etc. Closed

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Open Source Code :| No license does not mean free/open source! Examples: Supermongo, any unlicensed code, etc. :) Includes license that gives right to study, change, redistribute Open Source/Free So!ware Examples: CASA, IRAF, DS9, etc. Binaries :’( Examples: Keynote, PowerPoint, etc. Closed

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Open Source Code :| No license does not mean free/open source! Examples: Supermongo, any unlicensed code, etc. :) Includes license that gives right to study, change, redistribute Open Source/Free So!ware Examples: CASA, IRAF, DS9, etc. Binaries :’( Examples: Keynote, PowerPoint, etc. Open development Discussion is done in the open and anyone can join in! Examples: ENZO, yt, SunPy, Astropy, etc. :D Closed

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Open Source Code :| No license does not mean free/open source! Examples: Supermongo, any unlicensed code, etc. :) Includes license that gives right to study, change, redistribute Open Source/Free So!ware Examples: CASA, IRAF, DS9, etc. Binaries :’( Examples: Keynote, PowerPoint, etc. Open development Discussion is done in the open and anyone can join in! Examples: ENZO, yt, SunPy, Astropy, etc. :D Closed This talk

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What is the Astropy Project?

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The Astropy Project is a community effort to develop a single core package for Astronomy in Python and foster interoperability between Python astronomy packages.

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• Ryan Abernathey • Shailesh Ahuja • Tom Aldcro" • Anne Archibald • Cristian Ardelean • Matteo Bachetti • Kyle Barbary • Geert Barentsen • Pauline Barmby • Paul Barrett • Andreas Baumbach • Chris Beaumont • Daniel Bell • Kristin Berry • Francesco Biscani • Thompson Le Blanc • Christopher Bonnett • Joseph Jon Booker • Médéric Boquien • Azalee Bostroem • Matthew Bourque • Larry Bradley • Gustavo Bragança • Erik M. Bray • Eli Bressert • Hannes Breytenbach • Hugo Buddelmeijer • Doug Burke • Mihai Cara • Patti Carroll • Mabry Cervin • Pritish Chakraborty • Alex Conley • Jean Connelly • Simon Conseil • Ryan Cooke • Yannick Copin • Matthew Craig • Steven Crawford • Neil Crighton • Kelle Cruz • Daniel Datsev • Matt Davis • Christoph Deil • Nadia Dencheva • Jörg Dietrich • Axel Donath • Michael Droettboom • Zach Edwards • Jonathan Eisenhamer • Thomas Erben • Henry Ferguson • Jonathan Foster • Ryan Fox • Lehman Garrison • Simon Gibbons • Adam Ginsburg • Christoph Gohlke • Danny Goldstein • Perry Greenfield • Dylan Gregersen • Austen Groener • Frédéric Grollier • Karan Grover • Kevin Gullikson • Hans Moritz Günther • Alex Hagen • Paul Hirst • Moataz Hisham • Michael Hoenig • Emma Hogan • Derek Homeier • Chris Hanley • JC Hsu • Anthony Horton • Eric Jeschke • Joseph Jon Booker • Sarah Kendrew • Marten van Kerkwijk • Wolfgang Kerzendorf • Lennard Kiehl • Rashid Khan • Dominik Klaes • Kacper Kowalik • Roban Hultman Kramer • Arne de Laat • Antony Lee • Simon Liedtke • Pey Lian Lim • Joseph Long • Joe Lyman • Vinayak Mehta • Aaron Meisner • Serge Montagnac • José Sabater Montes • Brett Morris • Michael Mueller • Stuart Mumford • Demitri Muna • Prasanth Nair • Bogdan Nicula • Asra Nizami • Joe Philip Ninan • Bryce Nordgren • Miruna Oprescu • Carl Osterwisch • Luigi Paioro • Asish Panda • Madhura Parikh • Neil Parley • Sergio Pascual • Rohit Patil • David Perez-Suarez • Ray Plante • Orion Poplawski • Adrian Price-Whelan • J. Xavier Prochaska • David Pérez-Suárez • Tanuj Rastogi • Thomas Robitaille • Juan Luis Cano Rodríguez • Evert Rol • Alex Rudy • Joseph Ryan • Eloy Salinas • Gerrit Schellenberger • David Shiga • Albert Y. Shih • David Shupe • Jonathan Sick • Leo Singer • Brigitta Sipocz • Shivan Sornarajah • Shantanu Srivastava • Ole Streicher • Matej Stuchlik • Bernardo Sulzbach • James Taylor • Jeff Taylor • Kirill Tchernyshyov • Víctor Terrón • Scott Thomas • Erik Tollerud • James Turner • Jake VanderPlas • Miguel de Val-Borro • Jonathan Whitmore • Julien Woillez • Lisa Walter • Benjamin Alan Weaver • Jonathan Whitmore • Julien Woillez • Víctor Zabalza Project Coordinators: Perry Greenfield (STScI), Thomas Robitaille (MPIA), Erik Tollerud (Yale) Developers/Contributors for core package (as of 1st Nov 2015):

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4 major public releases (first release February 2013) Latest stable version: v1.0.6 (released 22nd October 2015) Over 150 individual contributors so far! Almost 14,000 commits (as of 1st November 2015) Astropy Core Package

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Image reprojection Publication-quality image plotting Machine learning Photometry Interface to many web services/archives Gamma-ray data analysis CCD image reduction Interfaces to ds9 Spectroscopic analysis ‘Big’ spectral cube analysis (e.g. ALMA, etc.) Spectral cube slicing etc. Astropy-affiliated packages

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How did the Astropy project start?

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[AstroPy] PyAstronomy Stefan Czesla • [AstroPy] Proliferating py-astro-libs Marshall Perrin ◦ [AstroPy] Proliferating py-astro-libs Wolfgang Kerzendorf ■ [AstroPy] Proliferating py-astro-libs Stefan Czesla ■ [AstroPy] Proliferating py-astro-libs Erik Tollerud ■ [AstroPy] Proliferating py-astro-libs Erik Bray ◦ [AstroPy] Proliferating py-astro-libs Taro Sato ■ [AstroPy] Proliferating py-astro-libs Thomas Robitaille ◦ [AstroPy] Proliferating py-astro-libs Thomas Robitaille ■ [AstroPy] Proliferating py-astro-libs Perry Greenfield ■ [AstroPy] Proliferating py-astro-libs Erik Tollerud ■ [AstroPy] Proliferating py-astro-libs Perry Greenfield ■ [AstroPy] Proliferating py-astro-libs James Turner ■ [AstroPy] Proliferating py-astro-libs James Turner ■ [AstroPy] Proliferating py-astro-libs Perry Greenfield ■ [AstroPy] Proliferating py-astro-libs Kelle Cruz ■ [AstroPy] Proliferating py-astro-libs Tom Aldcroft ■ [AstroPy] Proliferating py-astro-libs Matthew Turk ■ [AstroPy] Proliferating py-astro-libs Mubdi Rahman ■ [AstroPy] Proliferating py-astro-libs Perry Greenfield ■ [AstroPy] Proliferating py-astro-libs Tommy Grav ■ [AstroPy] Proliferating py-astro-libs Perry Greenfield ■ [AstroPy] Proliferating py-astro-libs Tommy Grav ■ [AstroPy] Proliferating py-astro-libs Christoph Deil ■ [AstroPy] Proliferating py-astro-libs James Turner ■ [AstroPy] Proliferating py-astro-libs Kelle Cruz ■ [AstroPy] Proliferating py-astro-libs Thomas Robitaille ■ [AstroPy] Proliferating py-astro-libs Victoria G. Laidler ■ [AstroPy] Proliferating py-astro-libs James Turner ■ [AstroPy] Proliferating py-astro-libs Thomas Robitaille ■ [AstroPy] Proliferating py-astro-libs Perry Greenfield ■ [AstroPy] Proliferating py-astro-libs Erik Tollerud ■ [AstroPy] Proliferating py-astro-libs Marcel Haas ■ [AstroPy] Proliferating py-astro-libs Neil Crighton ■ [AstroPy] organizing meetings to organize astropy Marshall Perrin ■ [AstroPy] Proliferating py-astro-libs Mark Sienkiewicz ■ [AstroPy] Proliferating py-astro-libs Thomas Robitaille etc ...

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First Astropy Coordination Meeting - Center for Astrophysics, 2011 (followed by STScI in 2012, Yale in 2013) In-person meetings are crucial

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Made with gource.io

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Open Development Astropy follows an model

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How can we ensure consistent code quality?

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def  test_constellations():        #  the  actual  test  for  accuracy  is  in  test_funcs  -­‐  this  is  just  meant  to  make        #  sure  we  get  sensible  answers        sc  =  SkyCoord(135*u.deg,  65*u.deg)        assert  sc.get_constellation()  ==  'Ursa  Major'        assert  sc.get_constellation(short_name=True)  ==  'UMa'        scs  =  SkyCoord([135]*2*u.deg,  [65]*2*u.deg)        npt.assert_equal(scs.get_constellation(),  ['Ursa  Major']*2)        npt.assert_equal(scs.get_constellation(short_name=True),  ['UMa']*2) (x 10,000)

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travis-ci.org (Linux and OSX testing) Python 3 MacOS X Documentation Style

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ci.appveyor.com (Windows testing)

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readthedocs.org (Documentation)

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Challenges for open-development projects (in no specific order)

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Challenge #1: Keeping the barrier of entry low

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Challenge #2: Heterogeneous development

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Challenge #3: Giving credit to contributors

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Challenge #4: Improving diversity

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Web: http://www.astropy.org Docs: http://docs.astropy.org Code: http://github.com/astropy/astropy Twitter: @astropy