A title would give away the talk contents ● I’m Ben Nuttall ● I work for the Raspberry Pi Foundation ● I do a lot of Python on Raspberry Pi 

pip install numpy ● Browse http://pypi.python.org/simple/numpy ● Look for a wheel file with a platform tag matching the current platform – If one is found, download and install :) – If no match is found, look for source tarball/zip ● If source is found, download and build from source :O ● If no source is found, fail :( 

Which type of x86/x86_64 are you? 

...I have them all 

Actually I’m linux_armv7l 

What? I’ve never heard of it. Here’s the source, build it yourself! ● PyPI doesn’t support uploading ARM wheels :( ● “pip install numpy” takes: – ~20 mins on Pi 3 (1.2GHz quad-core) – ~2.5 hours on Pi 1 (700MHz single-core) 

Fine! I’ll build my own package repository... ● cd Projects ● mkdir piwheels ● cd piwheels ● git init 

piwheels v1 ● Pi 3 in my living room ● Build the latest version of every package (106k packages) ● Log output into postgres database ● Host a package repository on the same Pi ● On GitHub but not reproducable 

piwheels v1 ● It took 10 days to complete the build run ● 76% build success rate ● Repository live at piwheels.bennuttall.com ● “pip install numpy ­i http://piwheels.bennuttall.com” works and takes 6 seconds :) 

piwheels v2 ● Pi 3 in a data centre (Thanks Mythic Beasts) ● Build every version of every package (740k releases) ● Host a package repository on the same Pi ● Repository live at www.piwheels.hostedpi.com ● Test suite, installation instructions & developer documentation on GitHub: – github.com/bennuttall/piwheels – Help! Contribute! 

In the future ● Complete the build backlog (in progress) ● Continue to build all new releases ● Try to fix failed builds (missing dependencies, etc) ● Rebuild Python 3.4 wheels for 3.5 & 3.6 ● Add the piwheels server to pip config in Raspbian (our distro) as an additional index – Users get wheels for free without needing to know about it 

pypi.org ● Next generation PyPI project ● A Google developer came across piwheels and filed an issue with the pypi.org project (warehouse) – github.com/pypa/warehouse/issues/2003 ● pypi.org now supports uploading ARM wheels :) – Thanks @kpayson64 and @dstufft ● Package maintainers can upload wheels built by piwheels to pypi.org and they appear on pypi.python.org – \o/