pip – requirements.txt depending on python version

pip – requirements.txt depending on python version

You can use the environment markers to achieve this in requirements.txt since pip 6.0:

SomeProject==5.4; python_version < 2.7
SomeProject; sys_platform == win32

It is supported by setuptools too by declaring extra requirements in setup.py:

setup(
    ...
    install_requires=[
        six,
        humanize,
    ],
    extras_require={
        :python_version == 2.7: [
            ipaddress,
        ],
    },
)

See also requirement specifiers.
And Strings for the string versions of corresponding Python commands.

You can create multiple requirements files, put those common packages in a common file, and include them in another pip requirements file with -r file_path

requirements/
  base.txt
  python2.txt
  python3.txt

python2.txt:

-r base.txt
Django==1.4 #python2 only packages

python3.txt:

-r base.txt
Django==1.5 #python3 only packages

pip install -r requirements/python2.txt

pip – requirements.txt depending on python version