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An overview of Adrian Price-Whelan ! adrn " adrianprw

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source: ADS

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source: ADS Python IDL Matlab Perl

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source: ADS Python IDL Matlab Perl Python is the de facto language in astronomical sciences

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What is

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Core package What is

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Core package What is Community

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Core package What is Community Ecosystem

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Adrian Price-Whelan Lyman J. Spitzer, Jr. Fellow Princeton University Astropy user & maintainer ! adrn " adrianprw

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I work on stellar dynamics in the Milky Way

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I work on stellar dynamics in the Milky Way

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I work on stellar dynamics in the Milky Way

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I work on stellar dynamics in the Milky Way

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eek I work on stellar dynamics in the Milky Way

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eek I work on stellar dynamics in the Milky Way

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eek I work on stellar dynamics in the Milky Way

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eek I work on stellar dynamics in the Milky Way

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I like to write code

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I like to write code not recommended

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What I use Python for: Data analysis / statistical modeling Dynamical models and simulations Analyze survey data Visualization

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My roles in the Astropy project: Deputy maintainer of astropy.coordinates Deputy maintainer of astropy.units Infrastructure lead for Astropy tutorials Maintainer of affiliated package: Gala

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How did I get involved?

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My first contribution to Astropy: (core package)

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My first contribution to Astropy: (core package) 0 new lines of code, ~4 lines of code rearranged

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My first major contribution to Astropy: Following in-person meeting and discussion with core devs Erik T., Tom R., …

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My first major contribution to Astropy: Following in-person meeting and discussion with core devs Erik T., Tom R., …

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Now: Top contributors start small!

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Key functionality and common tools needed for doing astronomy and astrophysics with Python The Astropy Core Package

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Key functionality and common tools needed for doing astronomy and astrophysics with Python The Astropy Core Package For example: Unit conversion and representation in code Time manipulations and representations File I/O for astronomical data formats Coordinate transformations

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For example: Units and coordinates

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For example: Reading and writing tables

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& so much more! physical constants (astropy.constants) units and quantities (astropy.units) Data Tables (astropy.table) Time and Dates (astropy.time) Coordinate Systems (astropy.coordinates) World Coordinate System (astropy.wcs) Models and Fitting (astropy.modeling) FITS File handling (astropy.io.fits) Cosmology (astropy.cosmology) Data Visualization (astropy.visualization) Astrostatistics Tools (astropy.stats)

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& so much more! physical constants (astropy.constants) units and quantities (astropy.units) Data Tables (astropy.table) Time and Dates (astropy.time) Coordinate Systems (astropy.coordinates) World Coordinate System (astropy.wcs) Models and Fitting (astropy.modeling) FITS File handling (astropy.io.fits) Cosmology (astropy.cosmology) Data Visualization (astropy.visualization) Astrostatistics Tools (astropy.stats)

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A collaborative effort ~240 contributors ~20 package leads & maintainers Who develops the Astropy Core Package?

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A collaborative effort ~240 contributors ~20 package leads & maintainers Who develops the Astropy Core Package?

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A collaborative effort ~240 contributors ~20 package leads & maintainers Who develops the Astropy Core Package?

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Maintainers Deputies

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Maintainers Deputies

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Maintainers Deputies • Evaluating & merging new pull requests by sub-package • Feature development & issue tracking

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The Astropy Coordination Committee Erik Tollerud Kelle Cruz Tom Aldcroft Tom Robitaille • Overall coordination and management of the Astropy project • Evaluating new affiliated packages • Arbitrating disagreements in the core package • Managing finances for the project

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Open source The Astropy Core Package

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Open development The Astropy Core Package

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Open development The Astropy Core Package

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Open development The Astropy Core Package

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Workflow almost entirely on GitHub The Astropy Core Package

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Software testing & Continuous integration The Astropy Core Package

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Software testing & Continuous integration The Astropy Core Package the “Build matrix”

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The Astropy Papers hacking the attribution system 2013 2018

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The Astropy Community “Our goal is to keep ours a positive, inclusive, successful, and growing community” - the Astropy code of conduct!

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What is The Astropy Community? …us! — Users & developers Many entry points: - Mailing lists: users, developers - Slack - Regular telecons - New: Astropy event calendar Conferences: - AAS workshops - Python in Astronomy - Coordination meetings In all forums, venues, contexts, follow the Astropy code of conduct!

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Core package: General tools, long-term stable, longer release schedule Affiliated packages: More specialized tools, faster development and release cycle - Can also be Astropy-coordinated, managed by the Astropy project The Astropy Ecosystem Core package + affiliated packages http://affiliated.astropy.org/

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Astropy-coordinated: photutils: detect and perform photometry of sources astroquery: tools for querying astronomical databases The Astropy Ecosystem Example affiliated packages Affiliated: poliastro: astrodynamics and orbital mechanics astroML: Astronomical machine learning and data mining http://affiliated.astropy.org/

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The Astropy Ecosystem Making it easier for scientists to package their software https://github.com/astropy/package-template Astropy package template: Provides template setup, installation, and documentation infrastructure e.g., template setup.py and build structure, Sphinx documentation, Py.test testing, Travis CI config.

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Need detailed reference and examples? Check the documentation! Find a bug? Need more examples? Make a GitHub issue! Know how to fix it? Want to add examples? Submit a pull request! Want to add cool new things / features? Best to chat to developers first via mailing lists, slack How to Use Astropy

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New initiative: "Learn Astropy" Funding from STScI to develop educational resources, e.g., tutorials Speak to Lia Corrales (or me, Kelle) if interested in contributing! How to learn Astropy

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After rapid growth of the project, now in plateau, need for stabilization How do we get back on the growth curve? Many lead / maintainer roles unfilled How do we prevent burnout and support devs? User -> Contributor -> Maintainer? We have applied for serious funding (>$106) As the project grows (esp. w/ official funding), how do we preserve the development culture? Challenges & The Future

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Questions?