install_requires in setup.py depending on installed Python version [duplicate]

Question

My setup.py looks something like this:

from distutils.core import setup

setup(
    [...]
    install_requires=['gevent', 'ssl', 'configobj', 'simplejson', 'mechanize'],
    [...]
)

Under Python 2.6 (or higher) the installation of the ssl module fails with:

ValueError: This extension should not be used with Python 2.6 or later (already built in), and has not been tested with Python 2.3.4 or earlier.

Is there a standard way to define dependencies only for specific python versions? Of course I could do it with if float(sys.version[:3]) < 2.6: but maybe there is a better way to do it.

i cannot find install_requires as an argument to distutils.core.setup it seems left over from setuptools. docs.python.org/2/distutils/apiref.html#distutils.core.setup — jrwren
– jrwren, Commented Apr 23, 2013 at 20:40

Keith · Accepted Answer · 2011-05-21 09:43:46Z

12

It's just a list, so somewhere above you have to conditionally build a list. Something like to following is commonly done.

import sys

if sys.version_info < (2 , 6):
    REQUIRES = ['gevent', 'ssl', 'configobj', 'simplejson', 'mechanize'],
else:
    REQUIRES = ['gevent', 'configobj', 'simplejson', 'mechanize'],

setup(
# [...]
    install_requires=REQUIRES,
# [...]
)

answered May 21, 2011 at 9:43

Keith

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ederag Over a year ago

There is now a better way, described in this answer

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