python-pexpect fails to build with Python 3.9.0a5.


=================================== FAILURES ===================================
_________________ InteractTestCase.test_interact_exit_unicode __________________

self = <tests.test_interact.InteractTestCase testMethod=test_interact_exit_unicode>

    def test_interact_exit_unicode(self):
        " Ensure subprocess receives utf8. "
        p = pexpect.spawnu('{self.interact_py} --utf8'.format(self=self),
                           timeout=5, env=self.env)
        p.expect('READY')
        p.send('É‘')              # >>> map(ord, u'É‘'.encode('utf8'))
        p.expect('201<STOP>')    # [201, 145]
        p.expect('145<STOP>')
        p.send('Î’')              # >>> map(ord, u'Î’'.encode('utf8'))
        p.expect('206<STOP>')    # [206, 146]
        p.expect('146<STOP>')
        p.send('\x00')
        if not os.environ.get('TRAVIS', None):
            # on Travis-CI, we sometimes miss trailing stdout from the
            # chain of child processes, not entirely sure why. So this
            # is skipped on such systems.
>           p.expect('0<STOP>')

tests/test_interact.py:91: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
pexpect/spawnbase.py:343: in expect
    return self.expect_list(compiled_pattern_list,
pexpect/spawnbase.py:372: in expect_list
    return exp.expect_loop(timeout)
pexpect/expect.py:179: in expect_loop
    return self.eof(e)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <pexpect.expect.Expecter object at 0x7f19e4e8ea30>
err = EOF('End Of File (EOF). Exception style platform.')

    def eof(self, err=None):
        spawn = self.spawn
    
        spawn.before = spawn._before.getvalue()
        spawn._buffer = spawn.buffer_type()
        spawn._before = spawn.buffer_type()
        spawn.after = EOF
        index = self.searcher.eof_index
        if index >= 0:
            spawn.match = EOF
            spawn.match_index = index
            return index
        else:
            spawn.match = None
            spawn.match_index = None
            msg = str(spawn)
            msg += '\nsearcher: %s' % self.searcher
            if err is not None:
                msg = str(err) + '\n' + msg
    
            exc = EOF(msg)
            exc.__cause__ = None # in Python 3.x we can use "raise exc from None"
>           raise exc
E           pexpect.exceptions.EOF: End Of File (EOF). Exception style platform.
E           <pexpect.pty_spawn.spawn object at 0x7f19e4e8e460>
E           command: /usr/bin/python3
E           args: [b'/usr/bin/python3', b'interact.py', b'--utf8']
E           buffer (last 100 chars): ''
E           before (last 100 chars): '\r\nEscaped interact\r\n'
E           after: <class 'pexpect.exceptions.EOF'>
E           match: None
E           match_index: None
E           exitstatus: None
E           flag_eof: True
E           pid: 348
E           child_fd: 16
E           closed: False
E           timeout: 5
E           delimiter: <class 'pexpect.exceptions.EOF'>
E           logfile: None
E           logfile_read: None
E           logfile_send: None
E           maxread: 2000
E           ignorecase: False
E           searchwindowsize: None
E           delaybeforesend: 0.05
E           delayafterclose: 0.1
E           delayafterterminate: 0.1
E           searcher: searcher_re:
E               0: re.compile('0<STOP>')

pexpect/expect.py:122: EOF
----------------------------- Captured stdout call -----------------------------

 tests.test_interact.InteractTestCase.test_interact_exit_unicode 

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.9/fedora-rawhide-x86_64/01330118-python-pexpect/

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

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.