On Thu, Oct 29, 2015 at 05:11:52PM -0400, Donald Stufft wrote: > On October 29, 2015 at 5:09:45 PM, Marcus Smith (qwc...@gmail.com) wrote: > > help me out here... how can we dynamically construct dependencies as we're > > building wheels today? > > I’m not sure I understand the confusion… since a wheel is created by > executing setup.py, you’d just have your build tool dynamically output > different wheels based on the system you’re building on (or whatever > axis is causing the dynamic dependencies). An example is like: > > https://github.com/pypa/twine/blob/a0c87357d9d5d588082c9a59f6efc6f6bc3d3498/setup.py#L28-L31
install_requires = [
"pkginfo >= 1.0",
"requests >= 2.3.0",
"requests-toolbelt >= 0.4.0",
"setuptools >= 0.7.0",
]
if sys.version_info[:2] < (2, 7):
install_requires += [
"argparse",
]
setup(
...
install_requires=install_requires,
)
But code like this doesn't work! You build a wheel on Python 2.7, you
get a twine-1.6.4-py2.py3-none-any.whl[*] in your pip wheel cache, and when
you try to install it on Python 2.6, pip tries to use the same wheel,
with install_requires computed for Python 2.7 instead of 2.6. Unless
you override the wheel dependencies completely in setup.cfg[+].
[*] https://github.com/pypa/twine/blob/master/setup.cfg#L2:
[wheel]
universal = 1
[+] https://github.com/pypa/twine/blob/master/setup.cfg#L9-L15
[metadata]
requires-dist =
requests >= 2.3.0
requests-toolbelt >= 0.4.0
pkginfo >= 1.0
setuptools >= 0.7.0
argparse; python_version == '2.6'
Marius Gedminas
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