Python 3.8 not supported

Python 3.8.0 released on 14th October, but Scipy does not support it. I tried updating pyproject.toml to the following:

[build-system]
requires = [
    "wheel",
    "setuptools",
    "Cython>=0.29.2",
    "numpy==1.13.3; python_version=='3.5' and platform_system!='AIX'",
    "numpy==1.13.3; python_version=='3.6' and platform_system!='AIX'",
    "numpy==1.14.5; python_version>='3.7' and platform_system!='AIX'",
    "numpy==1.16.0; python_version=='3.5' and platform_system=='AIX'",
    "numpy==1.16.0; python_version=='3.6' and platform_system=='AIX'",
    "numpy==1.16.0; python_version>='3.7' and platform_system=='AIX'",
    "numpy==1.17.2; python_version>='3.8' and platform_system=='AIX'",
    "pybind11>=2.2.4",
]

(My commit is here.)

I then installed scipy from source and ran python3.8 -c "import scipy; scipy.test(). The tests freeze at 79%.

.local/lib/python3.8/site-packages/scipy/sparse/tests/test_construct.py ........................                               [ 78%]
.local/lib/python3.8/site-packages/scipy/sparse/tests/test_csc.py ..                                                           [ 78%]
.local/lib/python3.8/site-packages/scipy/sparse/tests/test_csr.py ...                                                          [ 78%]
.local/lib/python3.8/site-packages/scipy/sparse/tests/test_extract.py ..                                                       [ 78%]
.local/lib/python3.8/site-packages/scipy/sparse/tests/test_matrix_io.py ......                                                 [ 79%]
.local/lib/python3.8/site-packages/scipy/sparse/tests/test_sparsetools.py ...

After using Ctrl+C to quit that test, it continues to 100% with the following final results:

========================================================== warnings summary ==========================================================
.local/lib/python3.8/site-packages/_pytest/mark/structures.py:321
.local/lib/python3.8/site-packages/_pytest/mark/structures.py:321
.local/lib/python3.8/site-packages/_pytest/mark/structures.py:321
.local/lib/python3.8/site-packages/_pytest/mark/structures.py:321
.local/lib/python3.8/site-packages/_pytest/mark/structures.py:321
  /home/sam/.local/lib/python3.8/site-packages/_pytest/mark/structures.py:321: PytestUnknownMarkWarning: Unknown pytest.mark.slow - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/latest/mark.html
    warnings.warn(

.local/lib/python3.8/site-packages/_pytest/mark/structures.py:321
.local/lib/python3.8/site-packages/_pytest/mark/structures.py:321
.local/lib/python3.8/site-packages/_pytest/mark/structures.py:321
.local/lib/python3.8/site-packages/_pytest/mark/structures.py:321
  /home/sam/.local/lib/python3.8/site-packages/_pytest/mark/structures.py:321: PytestUnknownMarkWarning: Unknown pytest.mark.xslow - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/latest/mark.html
    warnings.warn(

.local/lib/python3.8/site-packages/scipy/odr/tests/test_odr.py::TestODR::test_explicit
.local/lib/python3.8/site-packages/scipy/odr/tests/test_odr.py::TestODR::test_explicit
.local/lib/python3.8/site-packages/scipy/odr/tests/test_odr.py::TestODR::test_implicit
.local/lib/python3.8/site-packages/scipy/odr/tests/test_odr.py::TestODR::test_implicit
.local/lib/python3.8/site-packages/scipy/odr/tests/test_odr.py::TestODR::test_multi
.local/lib/python3.8/site-packages/scipy/odr/tests/test_odr.py::TestODR::test_multi
.local/lib/python3.8/site-packages/scipy/odr/tests/test_odr.py::TestODR::test_pearson
.local/lib/python3.8/site-packages/scipy/odr/tests/test_odr.py::TestODR::test_pearson
.local/lib/python3.8/site-packages/scipy/odr/tests/test_odr.py::TestODR::test_pearson
.local/lib/python3.8/site-packages/scipy/odr/tests/test_odr.py::TestODR::test_pearson
.local/lib/python3.8/site-packages/scipy/odr/tests/test_odr.py::TestODR::test_lorentz
.local/lib/python3.8/site-packages/scipy/odr/tests/test_odr.py::TestODR::test_lorentz
.local/lib/python3.8/site-packages/scipy/odr/tests/test_odr.py::TestODR::test_ticket_1253
.local/lib/python3.8/site-packages/scipy/odr/tests/test_odr.py::TestODR::test_ticket_1253
.local/lib/python3.8/site-packages/scipy/odr/tests/test_odr.py::TestODR::test_ifixx
.local/lib/python3.8/site-packages/scipy/odr/tests/test_odr.py::TestODR::test_ifixx
.local/lib/python3.8/site-packages/scipy/odr/tests/test_odr.py::TestODR::test_ifixx
.local/lib/python3.8/site-packages/scipy/odr/tests/test_odr.py::TestODR::test_ifixx
  /home/sam/.local/lib/python3.8/site-packages/scipy/odr/odrpack.py:1103: DeprecationWarning: PY_SSIZE_T_CLEAN will be required for '#' formats
    self.output = Output(odr(*args, **kwds))

-- Docs: https://docs.pytest.org/en/latest/warnings.html
================ 14520 passed, 1280 skipped, 1225 deselected, 77 xfailed, 8 xpassed, 27 warnings in 614.71s (0:10:14) ================

   Normal return from subroutine COBYLA

   NFVALS =   50   F = 2.485185E+01    MAXCV = 1.999965E-10
   X = 4.955358E+00   6.666553E-01

 NNLS quitting on iteration count.

Scipy/Numpy/Python version information:

Note: scipy was installed from source after modifying pyproject.toml (see code). 1.3.1 1.17.2 sys.version_info(major=3, minor=8, micro=0, releaselevel='final', serial=0)

[ilayn]

Have some patience please we are already trying to figure out what changed on python 3.8 that we have to fix. And the old ones should keep working with 3.7 so it is not that trivial.

[rgommers]

They’ll be added for SciPy 1.3.2, it’s on the way.