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Problem with pyyaml 6.0.2rc1

Issue has been reported: https://github.com/yaml/pyyaml/issues/810

Pyyaml supports python 3.6 or higher: https://github.com/yaml/pyyaml/blob/a2d19c0234866dc9d4d55abf3009699c258bb72f/setup.py#L355

This is fine for 6.0.1 but not for 6.0.2rc1

pip install --pre pyyaml

For python 3.7

Collecting pyyaml
  Downloading pyyaml-6.0.2rc1.tar.gz (130 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 130.6/130.6 kB 583.2 kB/s eta 0:00:00
  Installing build dependencies ... done
  Getting requirements to build wheel ... error
  error: subprocess-exited-with-error
  
  × Getting requirements to build wheel did not run successfully.
  │ exit code: 1
  ╰─> [19 lines of output]
      Traceback (most recent call last):
        File "/home/denolf/virtualenvs/pybox_PXIQMX/lib/python3.7/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
          main()
        File "/home/denolf/virtualenvs/pybox_PXIQMX/lib/python3.7/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 335, in main
          json_out['return_val'] = hook(**hook_input['kwargs'])
        File "/home/denolf/virtualenvs/pybox_PXIQMX/lib/python3.7/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 118, in get_requires_for_build_wheel
          return hook(config_settings)
        File "/tmp/pip-install-fcb2lvwm/pyyaml_642b39d7e27b4fea961033c121943a5b/packaging/_pyyaml_pep517.py", line 47, in _expose_config_settings
          return real_method(*args, **kwargs)
        File "/tmp/pip-build-env-dpq0y_ow/overlay/lib/python3.7/site-packages/setuptools/build_meta.py", line 341, in get_requires_for_build_wheel
          return self._get_build_requires(config_settings, requirements=['wheel'])
        File "/tmp/pip-build-env-dpq0y_ow/overlay/lib/python3.7/site-packages/setuptools/build_meta.py", line 323, in _get_build_requires
          self.run_setup()
        File "/tmp/pip-build-env-dpq0y_ow/overlay/lib/python3.7/site-packages/setuptools/build_meta.py", line 338, in run_setup
          exec(code, locals())
        File "<fstring>", line 1
          (self.include_dirs=)
                            ^
      SyntaxError: invalid syntax
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

× Getting requirements to build wheel did not run successfully.
│ exit code: 1
╰─> See above for output.

note: This error originates from a subprocess, and is likely not a problem with pip.

For python 3.6

Collecting pyyaml
  Downloading pyyaml-6.0.2rc1.tar.gz (130 kB)
     |████████████████████████████████| 130 kB 2.0 MB/s            
  Installing build dependencies ... done
  Getting requirements to build wheel ... error
  ERROR: Command errored out with exit status 1:
   command: /home/denolf/virtualenvs/pybox_mY2umA/bin/python /home/denolf/virtualenvs/pybox_mY2umA/lib/python3.6/site-packages/pip/_vendor/pep517/in_process/_in_process.py get_requires_for_build_wheel /tmp/tmpnoo4bm78
       cwd: /tmp/pip-install-4afg380b/pyyaml_cc0e7d6bd07742d9ac417689267335f5
  Complete output (10 lines):
  Traceback (most recent call last):
    File "/home/denolf/virtualenvs/pybox_mY2umA/lib/python3.6/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 363, in <module>
      main()
    File "/home/denolf/virtualenvs/pybox_mY2umA/lib/python3.6/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 345, in main
      json_out['return_val'] = hook(**hook_input['kwargs'])
    File "/home/denolf/virtualenvs/pybox_mY2umA/lib/python3.6/site-packages/pip/_vendor/pep517/in_process/_in_process.py", line 130, in get_requires_for_build_wheel
      return hook(config_settings)
    File "/tmp/pip-install-4afg380b/pyyaml_cc0e7d6bd07742d9ac417689267335f5/packaging/_pyyaml_pep517.py", line 36, in _expose_config_settings
      from contextlib import nullcontext
  ImportError: cannot import name 'nullcontext'
  ----------------------------------------
WARNING: Discarding https://files.pythonhosted.org/packages/ff/08/b6768d9f2da231c1396490e91471ffebb12b299a65cb369c27ec0e2a50c6/pyyaml-6.0.2rc1.tar.gz#sha256=826fb4d5ac2c48b9d6e71423def2669d4646c93b6c13612a71b3ac7bb345304b (from https://pypi.org/simple/pyyaml/) (requires-python:>=3.6). Command errored out with exit status 1: /home/denolf/virtualenvs/pybox_mY2umA/bin/python /home/denolf/virtualenvs/pybox_mY2umA/lib/python3.6/site-packages/pip/_vendor/pep517/in_process/_in_process.py get_requires_for_build_wheel /tmp/tmpnoo4bm78 Check the logs for full command output.
  Using cached PyYAML-6.0.1-cp36-cp36m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (677 kB)
Installing collected packages: pyyaml
Successfully installed pyyaml-6.0.1