Python 3.9: AttributeError: 'Thread' object has no attribute 'isAlive' about decorator HOT 2 CLOSED

+ /usr/bin/python3 setup.py test
running test
WARNING: Testing via this command is deprecated and will be removed in a future version. Users looking for a generic test entry point independent of test runner are encouraged to use tox.
running egg_info
writing src/decorator.egg-info/PKG-INFO
writing dependency_links to src/decorator.egg-info/dependency_links.txt
writing top-level names to src/decorator.egg-info/top_level.txt
reading manifest file 'src/decorator.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no files found matching 'README.rst'
warning: no files found matching 'documentation.pdf'
writing manifest file 'src/decorator.egg-info/SOURCES.txt'
running build_ext
Traceback (most recent call last):
  File "/builddir/build/BUILD/decorator-4.4.0/setup.py", line 9, in <module>
    setup(name='decorator',
  File "/usr/lib/python3.9/site-packages/setuptools/__init__.py", line 145, in setup
    return distutils.core.setup(**attrs)
  File "/usr/lib64/python3.9/distutils/core.py", line 148, in setup
    dist.run_commands()
  File "/usr/lib64/python3.9/distutils/dist.py", line 966, in run_commands
    self.run_command(cmd)
  File "/usr/lib64/python3.9/distutils/dist.py", line 985, in run_command
    cmd_obj.run()
  File "/usr/lib/python3.9/site-packages/setuptools/command/test.py", line 237, in run
    self.run_tests()
  File "/usr/lib/python3.9/site-packages/setuptools/command/test.py", line 255, in run_tests
    test = unittest.main(
  File "/usr/lib64/python3.9/unittest/main.py", line 100, in __init__
    self.parseArgs(argv)
  File "/usr/lib64/python3.9/unittest/main.py", line 147, in parseArgs
    self.createTests()
  File "/usr/lib64/python3.9/unittest/main.py", line 158, in createTests
    self.test = self.testLoader.loadTestsFromNames(self.testNames,
  File "/usr/lib64/python3.9/unittest/loader.py", line 220, in loadTestsFromNames
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "/usr/lib64/python3.9/unittest/loader.py", line 220, in <listcomp>
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "/usr/lib64/python3.9/unittest/loader.py", line 191, in loadTestsFromName
    return self.loadTestsFromModule(obj)
  File "/usr/lib/python3.9/site-packages/setuptools/command/test.py", line 55, in loadTestsFromModule
    tests.append(self.loadTestsFromName(submodule))
  File "/usr/lib64/python3.9/unittest/loader.py", line 154, in loadTestsFromName
    module = __import__(module_name)
  File "/builddir/build/BUILD/decorator-4.4.0/src/tests/documentation.py", line 1785, in <module>
    class SomeSet(collections.Sized):
AttributeError: module 'collections' has no attribute 'Sized'