How to require importlib.resources in a Python setup script

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I have a Python package that attempts to import the importlib.resources module (added in Python 3.7, as I understand), and then falls back on importing importlib_resources if this fails. importlib_resources is provided by the PyPI package importlib-resources.

So, I want my pip install dependencies to be "nothing if running 3.7 or newer, importlib-resources otherwise".

Is there some way to specify this dependency in the setup script?

python-importlib pip python-packaging python
1 Answers

This is done using environment markers. The syntax for a setuptools build system looks like this:

from setuptools import setup

setup(
    ...
    install_requires=[
        'importlib_resources; python_version < "3.7"',
    ]
)
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