Installing 3.9.0 release via pip is somehow broken

[don-philipe]

Hello,

I have a problem with the installation of the current 3.9.0 release and I can't figure out where the problem comes from. The installation via pip is somehow broken since yesterday. Before yesterday everything worked fine.

My temporary solution is to switch back to the 3.8.1 release which I can install without problems.

I have

• [x] Tested with the latest release
• [ ] Tested with the current master branch
• [x] Searched for similar existing issues

Expected behaviour

pysolr should be installable via pip install -r requirements.txt in a virtual environment.

Actual behaviour

Installation via pip install -r requirements.txt leads to the following error:

Collecting pysolr==3.9.0 (from -r requirements.txt (line 1))
  Downloading https://files.pythonhosted.org/packages/9c/c6/9f0b80f17747db12acbdf421a22acdad23c93eea7046181ae6ebdf427bfd/pysolr-3.9.0.tar.gz (55kB)
    100% |████████████████████████████████| 61kB 27.5MB/s 
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-k5bccgt8/pysolr/setup.py", line 29, in <module>
        setup_requires=["setuptools_scm"],
      File "$HOME/pysolr-test/venv/lib/python3.6/site-packages/setuptools/__init__.py", line 143, in setup
        return distutils.core.setup(**attrs)
      File "/usr/local/lib/python3.6/distutils/core.py", line 108, in setup
        _setup_distribution = dist = klass(attrs)
      File "$HOME/pysolr-test/venv/lib/python3.6/site-packages/setuptools/dist.py", line 442, in __init__
        k: v for k, v in attrs.items()
      File "/usr/local/lib/python3.6/distutils/dist.py", line 281, in __init__
        self.finalize_options()
      File "$HOME/pysolr-test/venv/lib/python3.6/site-packages/setuptools/dist.py", line 601, in finalize_options
        ep.load()(self, ep.name, value)
      File "$HOME/pysolr-test/venv/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2346, in load
        return self.resolve()
      File "$HOME/pysolr-test/venv/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2352, in resolve
        module = __import__(self.module_name, fromlist=['__name__'], level=0)
      File "/tmp/pip-install-k5bccgt8/pysolr/.eggs/setuptools_scm-7.0.3-py3.6.egg/setuptools_scm/__init__.py", line 5
        from __future__ import annotations
        ^
    SyntaxError: future feature annotations is not defined
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-k5bccgt8/pysolr/

Steps to reproduce the behaviour

1. create virtual environment via python3 -m venv venv and activate it with source venv/bin/activate
2. put pysolr==3.9.0 into a file named requirements.txt
3. run pip install -r requirements.txt

Configuration

• Operating system version: Ubuntu 21.10, CentOS 7
• Search engine version: 8.11.1
• Python version: 3.6.13
• pysolr version: 3.9.0