Get rid of setuptools as a runtime dependency

[flying-sheep]

pkg_resources is provided by setuptools:

altgraph/altgraph/__init__.py

Line 144 in e288b53

__version__ = pkg_resources.require("altgraph")[0].version

The stdlib’s replacement for this line would be

from importlib.metadata import version

 __version__ = version("altgraph")

If you want to be compatible with Python <3.8, you could do:

try:
    from importlib.metadata import version
except ImportError:  # Python <3.8
    from importlib_metadata import version

 __version__ = version("altgraph")

which would use this conditional dependency: importlib-metadata; python_version < '3.8'

You could also just do #12 instead. Flit sources the metadata version from a version string in __init__.py so this would just become __version__ = '0.17.4'

[tobylightheart]

This usage of pkg_resources is breaking for me in Windows. I haven't done exhaustive testing, but L144 in __init__.py was throwing "distribution was not found" errors in a clean venv in Python 3.11.8 (Windows).

Using the importlib approach resolved the error.

Python 3.11.8 (tags/v3.11.8:db85d51, Feb  6 2024, 22:03:32) [MSC v.1937 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import altgraph
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\Toby\_code\venv\altgraph\Lib\site-packages\altgraph\__init__.py", line 144, in <module>
    __version__ = pkg_resources.require("altgraph")[0].version
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Toby\_code\venv\altgraph\Lib\site-packages\pkg_resources\__init__.py", line 909, in require
    needed = self.resolve(parse_requirements(requirements))
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Toby\_code\venv\altgraph\Lib\site-packages\pkg_resources\__init__.py", line 795, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'altgraph' distribution was not found and is required by the application