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I'm not sure that it's a good practice to rewrite .pyc files of the stdlib while tests are run in parallel.
Maybe the test should copy all .py files of the stdlib into a temporary directory and work there, to not impact other tests run in parallel.
Example on AMD64 Windows7 SP1 3.8:
https://buildbot.python.org/all/#/builders/208/builds/105
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FAIL: test_no_args_respects_force_flag (test.test_compileall.CommmandLineTestsWithSourceEpoch)
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Traceback (most recent call last):
 File "C:\buildbot.python.org3円.8.kloth-win64\build\lib\test\test_py_compile.py", line 30, in wrapper
 return fxn(*args, **kwargs)
 File "C:\buildbot.python.org3円.8.kloth-win64\build\lib\test\test_py_compile.py", line 20, in wrapper
 return fxn(*args, **kwargs)
 File "C:\buildbot.python.org3円.8.kloth-win64\build\lib\test\test_compileall.py", line 322, in test_no_args_respects_force_flag
 self.assertRunOK('-f', PYTHONPATH=self.directory)
 File "C:\buildbot.python.org3円.8.kloth-win64\build\lib\test\test_compileall.py", line 271, in assertRunOK
 rc, out, err = script_helper.assert_python_ok(
 File "C:\buildbot.python.org3円.8.kloth-win64\build\lib\test\support\script_helper.py", line 157, in assert_python_ok
 return _assert_python(True, *args, **env_vars)
 File "C:\buildbot.python.org3円.8.kloth-win64\build\lib\test\support\script_helper.py", line 143, in _assert_python
 res.fail(cmd_line)
 File "C:\buildbot.python.org3円.8.kloth-win64\build\lib\test\support\script_helper.py", line 70, in fail
 raise AssertionError("Process return code is %d\n"
AssertionError: Process return code is 1
command line: ['C:\\buildbot.python.org\3円.8.kloth-win64\\build\\PCbuild\\amd64\\python_d.exe', '-X', 'faulthandler', '-S', '-m', 'compileall', '-f']
stdout:
---
(... truncated stdout ...)ling 'C:\\buildbot.python.org\3円.8.kloth-win64\\build\\lib\\ipaddress.py'...
Compiling 'C:\\buildbot.python.org\3円.8.kloth-win64\\build\\lib\\keyword.py'...
Compiling 'C:\\buildbot.python.org\3円.8.kloth-win64\\build\\lib\\linecache.py'...
Compiling 'C:\\buildbot.python.org\3円.8.kloth-win64\\build\\lib\\locale.py'...
(...)
*** PermissionError: [WinError 5] Access is denied: 'C:\\buildbot.python.org\3円.8.kloth-win64\\build\\lib\\__pycache__\\site.cpython-38.pyc.25436544' -> 'C:\\buildbot.python.org\3円.8.kloth-win64\\build\\lib\\__pycache__\\site.cpython-38.pyc'
(...)
Compiling 'C:\\buildbot.python.org\3円.8.kloth-win64\\build\\lib\\zipapp.py'...
Compiling 'C:\\buildbot.python.org\3円.8.kloth-win64\\build\\lib\\zipfile.py'...
Compiling 'C:\\buildbot.python.org\3円.8.kloth-win64\\build\\lib\\zipimport.py'...
---
stderr:
---
---
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Ran 81 tests in 25.827s
FAILED (failures=1, skipped=2)
test test_compileall failed