DeprecationWarning: PY_SSIZE_T_CLEAN will be required for '#' formats

[olebole]

I got the following bug report as Debian#983149:

When running the following lines

from ephem import Mars, constellation
m = Mars('1970')
print(constellation(m))

one gets the warning

DeprecationWarning: PY_SSIZE_T_CLEAN will be required for '#' formats

This is Python 3.9.1+.

[brandon-rhodes]

Interesting! Thanks for letting us know, this will need to be tackled before the next release.

[hrnciar]

Hello, we are testing Python 3.10.0+ in Fedora and this is not anymore DeprecationWarning.

=================================== FAILURES ===================================
_______________________ FunctionTests.test_constellation _______________________

self = <ephem.tests.test_bodies.FunctionTests testMethod=test_constellation>

    def test_constellation(self):
        oneb = readdb('Orion Nebula,f,5.59,-5.45,2,2000.0,')
        oneb.compute('1999/2/28')
>       self.assertEqual(constellation(oneb), ('Ori', 'Orion'))
E       SystemError: PY_SSIZE_T_CLEAN macro must be defined for '#' formats

tests/test_bodies.py:309: SystemError

https://docs.python.org/3.10/whatsnew/3.10.html#id2

The PY_SSIZE_T_CLEAN macro must now be defined to use PyArg_ParseTuple() and Py_BuildValue() formats which use #: es#, et#, s#, u#, y#, z#, U# and Z#. See Parsing arguments and building values and the PEP 353. https://bugs.python.org/issue40943

Downstream report: https://bugzilla.redhat.com/show_bug.cgi?id=1891793

[brandon-rhodes]

Thanks for letting us know! I've not heard of that constant before, but it looks like there are fairly full explanations of what's going on in the docs, so it should hopefully be straightforward to fix once I (or another contributor) has time.