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I have a Python library. Unfortunately I have not updated it to work with Python 3 yet.
In its setup.py, I added
install_requires=['python<3'], My intent was to not allow this package to be installed/used under Python 3, because I know it doesn't (yet) work. I don't think this is the right way to do it, because pip then tries to download and install python 2.7.3 (which is already the installed version!).
How should I specify my library dependency on a particular range of Python interpreter versions? Should I add a Programming Language :: Python :: 2 :: Only tag? Will this actually prevent installation under Python 3? What if I also want to restrict the minimum version to Python 2.6?
I'd prefer a solution that works everywhere, but would settle for one that only works in pip (and hopefully doesn't cause easy_install to choke).
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As the setup.py file is installed via pip (and pip itself is run by the python interpreter) it is not possible to specify which Python version to use in the setup.py file.
It provides a __version__ attribute. It provides the standard metadata version. Therefore it will be detected by pkg_resources or other tools that parse the package metadata (EGG-INFO and/or PKG-INFO, PEP 0345).
As a first step, pip needs to get metadata about a package (name, version, dependencies, and more). It collects this by calling setup.py egg_info . The egg_info command generates the metadata for the package, which pip can then consume and proceed to gather all the dependencies of the package.
The setup.py file may be the most significant file that should be placed at the root of the Python project directory. It primarily serves two purposes: It includes choices and metadata about the program, such as the package name, version, author, license, minimal dependencies, entry points, data files, and so on.
As of version 9.0.1 pip will honor a new python_requires string, specifying the Python version required for installation, e.g, for example if one wishes to enforce minimum Python version of 3.3:
setup( ..., python_requires=">=3.3" ) See here for more details. See also this answer on SO.
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