python-astroscrappy fails to build with Python 3.9.0a3.

+ cd astroscrappy-1.0.8
+ /usr/bin/python3 setup.py test
Download error on https://pypi.python.org/simple/astropy-helpers/: [Errno -2] Name or service not known -- Some packages may not be found!
Download error on https://pypi.python.org/simple/: [Errno -2] Name or service not known -- Some packages may not be found!
running test
installing to temporary directory: /tmp/astroscrappy-test-2r9ar0sv
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/tmp/astroscrappy-test-2r9ar0sv/lib64/python3.9/site-packages/astroscrappy/_astropy_init.py", line 109, in test
    return test_runner.run_tests(
  File "/usr/lib64/python3.9/site-packages/astropy/tests/runner.py", line 611, in run_tests
    return super().run_tests(**kwargs)
  File "/usr/lib64/python3.9/site-packages/astropy/tests/runner.py", line 208, in run_tests
    self._has_test_dependencies()  # pragma: no cover
  File "/usr/lib64/python3.9/site-packages/astropy/tests/runner.py", line 187, in _has_test_dependencies
    raise RuntimeError(
RuntimeError: Test dependencies are missing: pytest_astropy_header. You should install the 'pytest-astropy' package (you may need to update the package if you have a previous version installed, e.g., 'pip install pytest-astropy --upgrade' or the equivalent with conda).

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.9/fedora-rawhide-x86_64/01209432-python-astroscrappy/

For all our attempts to build python-astroscrappy with Python 3.9, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.9/package/python-astroscrappy/

Testing and mass rebuild of packages is happening in copr. You can follow these instructions to test locally in mock if your package builds with Python 3.9:
https://copr.fedorainfracloud.org/coprs/g/python/python3.9/

Let us know here if you have any questions.

Python 3.9 will be included in Fedora 33. To make that update smoother, we're building Fedora packages with early pre-releases of Python 3.9.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires), so if this package is required a lot, it's important for us to get it fixed soon.
We'd appreciate help from the people who know this package best, but if you don't want to work on this now, let us know so we can try to work around it on our side.