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We Store Cheese in the Warehouse

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http://lucumr.pocoo.org/2012/6/22/hate-hate-hate-everywhere/

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2012

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Party Like It’s 2012 • Setuptools • site and .pth files • Eggs

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Setuptools • Package metadata • Dependency resolution! • easy_install

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LIAR!!!1

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.pth • Path configuration file • Placed in site-packages • Populate sys.path at runtime

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A PIL Tutorial >>> import Image >>> im = Image.open("louie.jpg") >>> im.show() https://gist.github.com/bradmontgomery/3125124 ?

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$ ls $LIB/python2.7/site-packages PIL pkg_resources PIL.pth setuptools easy_install.py setuptools-36.5.0.dist-info easy_install.pyc wheel pip wheel-0.30.0.dist-info pip-9.0.1.dist-info

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>>> import Image >>> print(Image.__file__) lib/python2.7/site-packages/PIL/Image.pyc >>> import sys >>> for path in sys.path: ... print path ... (more...) lib/python2.7/site-packages/PIL (more...)

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$ ls $LIB/python2.7/site-packages PIL pkg_resources PIL.pth setuptools easy_install.py setuptools-36.5.0.dist-info easy_install.pyc wheel pip wheel-0.30.0.dist-info pip-9.0.1.dist-info This

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PTH FILES PTH FILES EVERYWHERE

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2014

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Now

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PyPA’s Schedule • Merge back Distribute • New binary format (wheel) • Built-in Setuptools and Pip • Better Security

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HTTPS support on PyPI

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https://packaging.python.org

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Next

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Package Author Server User

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https://pypi.org

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https://github.com/pypa/warehouse

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Package Author Server User

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https://pipenv.org

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Pipfile • “Requirements 2.0” • Eventual pip -p integration • https://github.com/pypa/pipfile

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Pipfile • The “lock” concept • PEP 508 environment markers • Robust file format

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Package Author Server User

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SETUP.PY INSTALL MUST DIE

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setup.py • Ad-hoc executable is always wrong • Don’t know what will happen until they actually happen • Wrong assumptions on top of wrong assumptions

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https://en.wikipedia.org/wiki/Catch-22_(logic)

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pyproject.toml • Declarative data file • PEP 508 for requirement specification • Eventual support in Pip

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Summary • Use Pipenv to manage projects • Use modern tools to distribute packages • Adopt PEP 508, prepare for PEP 518

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Summary • A lot can happen in five years • PyPA rocks, please help them • Looking forward to the next five!

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