Ned Batchelder added the comment:
I doubt very very much that coverage.py is stealing stderr. Many many test
suites would have this problem if that were true. More likely is that somehow
__del__ is not being invoked when you need it to be.
I tried running the tests under coverage also, and did not see this behavior. I
don't have a build tree of the latest code, but I ran it on 3.6.0. The tests
passed both with and without coverage measurement (output below). I would like
to understand why you are seeing the results you are.
$ mkvirtualenv -p python3.6 issue29048
Running virtualenv with interpreter /usr/local/bin/python3.6
Using base prefix '/usr/local/pythonz/pythons/CPython-3.6.0'
New python executable in issue29048/bin/python3.6
Also creating executable in issue29048/bin/python
Installing setuptools, pip, wheel...done.
Collecting pip
Using cached pip-9.0.1-py2.py3-none-any.whl
Collecting setuptools
Using cached setuptools-32.2.0-py2.py3-none-any.whl
Installing collected packages: pip, setuptools
Found existing installation: pip 7.1.2
Uninstalling pip-7.1.2:
Successfully uninstalled pip-7.1.2
Found existing installation: setuptools 18.2
Uninstalling setuptools-18.2:
Successfully uninstalled setuptools-18.2
Successfully installed pip-9.0.1 setuptools-32.2.0
(issue29048)$ pip install coverage
Collecting coverage
Installing collected packages: coverage
Successfully installed coverage-4.2
(issue29048)$ python3.6 -m test -v test_exceptions
== CPython 3.6.0 (default, Dec 23 2016, 07:11:25) [GCC 4.2.1 Compatible Apple
LLVM 7.0.2 (clang-700.1.81)]
== Darwin-14.5.0-x86_64-i386-64bit little-endian
== hash algorithm: siphash24 64bit
== cwd:
/private/var/folders/j2/gr3cj3jn63s5q8g3bjvw57hm0000gp/T/test_python_20266
== encodings: locale=UTF-8, FS=utf-8
Testing with flags: sys.flags(debug=0, inspect=0, interactive=0, optimize=0,
dont_write_bytecode=0, no_user_site=0, no_site=0, ignore_environment=0,
verbose=0, bytes_warning=0, quiet=0, hash_randomization=1, isolated=0)
Run tests sequentially
0:00:00 [1/1] test_exceptions
testAttributes (test.test_exceptions.ExceptionTests) ... ok
testChainingAttrs (test.test_exceptions.ExceptionTests) ... ok
testChainingDescriptors (test.test_exceptions.ExceptionTests) ... ok
testExceptionCleanupNames (test.test_exceptions.ExceptionTests) ... ok
testExceptionCleanupState (test.test_exceptions.ExceptionTests) ... ok
testInfiniteRecursion (test.test_exceptions.ExceptionTests) ... ok
testInvalidAttrs (test.test_exceptions.ExceptionTests) ... ok
testInvalidTraceback (test.test_exceptions.ExceptionTests) ... ok
testKeywordArgs (test.test_exceptions.ExceptionTests) ... ok
testNoneClearsTracebackAttr (test.test_exceptions.ExceptionTests) ... ok
testRaising (test.test_exceptions.ExceptionTests) ... ok
testSettingException (test.test_exceptions.ExceptionTests) ... ok
testSyntaxErrorMessage (test.test_exceptions.ExceptionTests) ... ok
testSyntaxErrorOffset (test.test_exceptions.ExceptionTests) ... ok
testWithTraceback (test.test_exceptions.ExceptionTests) ... ok
test_3114 (test.test_exceptions.ExceptionTests) ... ok
test_MemoryError (test.test_exceptions.ExceptionTests) ... ok
test_WindowsError (test.test_exceptions.ExceptionTests) ... ok
test_badisinstance (test.test_exceptions.ExceptionTests) ... ok
test_errno_ENOTDIR (test.test_exceptions.ExceptionTests) ... ok
test_exception_target_in_nested_scope (test.test_exceptions.ExceptionTests) ...
ok
test_exception_with_doc (test.test_exceptions.ExceptionTests) ... ok
test_generator_close_cleanup_exc_state (test.test_exceptions.ExceptionTests)
... ok
test_generator_del_cleanup_exc_state (test.test_exceptions.ExceptionTests) ...
ok
test_generator_doesnt_retain_old_exc (test.test_exceptions.ExceptionTests) ...
ok
test_generator_finalizing_and_exc_info (test.test_exceptions.ExceptionTests)
... ok
test_generator_leaking (test.test_exceptions.ExceptionTests) ... ok
test_generator_leaking2 (test.test_exceptions.ExceptionTests) ... ok
test_generator_leaking3 (test.test_exceptions.ExceptionTests) ... ok
test_generator_leaking4 (test.test_exceptions.ExceptionTests) ... ok
test_generator_next_cleanup_exc_state (test.test_exceptions.ExceptionTests) ...
ok
test_generator_send_cleanup_exc_state (test.test_exceptions.ExceptionTests) ...
ok
test_generator_throw_cleanup_exc_state (test.test_exceptions.ExceptionTests)
... ok
test_memory_error_cleanup (test.test_exceptions.ExceptionTests) ... ok
test_recursion_error_cleanup (test.test_exceptions.ExceptionTests) ... ok
test_str (test.test_exceptions.ExceptionTests) ... ok
test_unhandled (test.test_exceptions.ExceptionTests) ... ok
test_unicode_change_attributes (test.test_exceptions.ExceptionTests) ... ok
test_unicode_errors_no_object (test.test_exceptions.ExceptionTests) ... ok
test_unraisable (test.test_exceptions.ExceptionTests) ... ok
test_windows_message (test.test_exceptions.ExceptionTests)
Should fill in unknown error code in Windows error message ... skipped 'test
specific to Windows'
test_attributes (test.test_exceptions.ImportErrorTests) ... ok
test_non_str_argument (test.test_exceptions.ImportErrorTests) ... ok
----------------------------------------------------------------------
Ran 43 tests in 0.027s
OK (skipped=1)
1 test OK.
Total duration: 64 ms
Tests result: SUCCESS
(issue29048)$ python -m coverage run --pylib -m test -v test_exceptions
== CPython 3.6.0 (default, Dec 23 2016, 07:11:25) [GCC 4.2.1 Compatible Apple
LLVM 7.0.2 (clang-700.1.81)]
== Darwin-14.5.0-x86_64-i386-64bit little-endian
== hash algorithm: siphash24 64bit
== cwd:
/private/var/folders/j2/gr3cj3jn63s5q8g3bjvw57hm0000gp/T/test_python_20270
== encodings: locale=UTF-8, FS=utf-8
Testing with flags: sys.flags(debug=0, inspect=0, interactive=0, optimize=0,
dont_write_bytecode=0, no_user_site=0, no_site=0, ignore_environment=0,
verbose=0, bytes_warning=0, quiet=0, hash_randomization=1, isolated=0)
Run tests sequentially
0:00:00 [1/1] test_exceptions
testAttributes (test.test_exceptions.ExceptionTests) ... ok
testChainingAttrs (test.test_exceptions.ExceptionTests) ... ok
testChainingDescriptors (test.test_exceptions.ExceptionTests) ... ok
testExceptionCleanupNames (test.test_exceptions.ExceptionTests) ... ok
testExceptionCleanupState (test.test_exceptions.ExceptionTests) ... ok
testInfiniteRecursion (test.test_exceptions.ExceptionTests) ... ok
testInvalidAttrs (test.test_exceptions.ExceptionTests) ... ok
testInvalidTraceback (test.test_exceptions.ExceptionTests) ... ok
testKeywordArgs (test.test_exceptions.ExceptionTests) ... ok
testNoneClearsTracebackAttr (test.test_exceptions.ExceptionTests) ... ok
testRaising (test.test_exceptions.ExceptionTests) ... ok
testSettingException (test.test_exceptions.ExceptionTests) ... ok
testSyntaxErrorMessage (test.test_exceptions.ExceptionTests) ... ok
testSyntaxErrorOffset (test.test_exceptions.ExceptionTests) ... ok
testWithTraceback (test.test_exceptions.ExceptionTests) ... ok
test_3114 (test.test_exceptions.ExceptionTests) ... ok
test_MemoryError (test.test_exceptions.ExceptionTests) ... ok
test_WindowsError (test.test_exceptions.ExceptionTests) ... ok
test_badisinstance (test.test_exceptions.ExceptionTests) ... ok
test_errno_ENOTDIR (test.test_exceptions.ExceptionTests) ... ok
test_exception_target_in_nested_scope (test.test_exceptions.ExceptionTests) ...
ok
test_exception_with_doc (test.test_exceptions.ExceptionTests) ... ok
test_generator_close_cleanup_exc_state (test.test_exceptions.ExceptionTests)
... ok
test_generator_del_cleanup_exc_state (test.test_exceptions.ExceptionTests) ...
ok
test_generator_doesnt_retain_old_exc (test.test_exceptions.ExceptionTests) ...
ok
test_generator_finalizing_and_exc_info (test.test_exceptions.ExceptionTests)
... ok
test_generator_leaking (test.test_exceptions.ExceptionTests) ... ok
test_generator_leaking2 (test.test_exceptions.ExceptionTests) ... ok
test_generator_leaking3 (test.test_exceptions.ExceptionTests) ... ok
test_generator_leaking4 (test.test_exceptions.ExceptionTests) ... ok
test_generator_next_cleanup_exc_state (test.test_exceptions.ExceptionTests) ...
ok
test_generator_send_cleanup_exc_state (test.test_exceptions.ExceptionTests) ...
ok
test_generator_throw_cleanup_exc_state (test.test_exceptions.ExceptionTests)
... ok
test_memory_error_cleanup (test.test_exceptions.ExceptionTests) ... ok
test_recursion_error_cleanup (test.test_exceptions.ExceptionTests) ... ok
test_str (test.test_exceptions.ExceptionTests) ... ok
test_unhandled (test.test_exceptions.ExceptionTests) ... ok
test_unicode_change_attributes (test.test_exceptions.ExceptionTests) ... ok
test_unicode_errors_no_object (test.test_exceptions.ExceptionTests) ... ok
test_unraisable (test.test_exceptions.ExceptionTests) ... ok
test_windows_message (test.test_exceptions.ExceptionTests)
Should fill in unknown error code in Windows error message ... skipped 'test
specific to Windows'
test_attributes (test.test_exceptions.ImportErrorTests) ... ok
test_non_str_argument (test.test_exceptions.ImportErrorTests) ... ok
----------------------------------------------------------------------
Ran 43 tests in 0.036s
OK (skipped=1)
1 test OK.
Total duration: 95 ms
Tests result: SUCCESS
(issue29048)$ python -m coverage report
Name
Stmts Miss Cover
--------------------------------------------------------------------------------------------------------------
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/_bootlocale.py
17 13 24%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/_collections_abc.py
562 546 3%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/_osx_support.py
210 161 23%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/_sysconfigdata_m_darwin_darwin.py
1 0 100%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/_weakrefset.py
146 109 25%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/abc.py
92 65 29%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/argparse.py
1187 757 36%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/base64.py
315 268 15%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/codecs.py
398 377 5%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/collections/__init__.py
677 650 4%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/contextlib.py
163 140 14%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/difflib.py
669 606 9%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/email/__init__.py
14 8 43%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/email/base64mime.py
40 26 35%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/email/charset.py
122 78 36%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/email/encoders.py
28 19 32%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/email/errors.py
37 7 81%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/email/header.py
310 258 17%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/email/quoprimime.py
115 83 28%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/encodings/__init__.py
76 43 43%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/encodings/latin_1.py
19 18 5%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/enum.py
438 248 43%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/functools.py
443 421 5%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/genericpath.py
72 50 31%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/gettext.py
389 323 17%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/gzip.py
349 298 15%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/importlib/__init__.py
99 96 3%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/importlib/_bootstrap.py
631 445 29%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/importlib/_bootstrap_external.py
711 528 26%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/importlib/util.py
147 140 5%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/ipaddress.py
904 597 34%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/linecache.py
102 55 46%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/locale.py
399 357 11%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/logging/__init__.py
769 521 32%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/logging/handlers.py
663 534 19%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/lzma.py
135 130 4%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/multiprocessing/process.py
163 162 1%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/nntplib.py
559 457 18%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/os.py
536 489 9%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/platform.py
580 466 20%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/posixpath.py
320 222 31%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/pprint.py
419 351 16%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/queue.py
111 76 32%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/quopri.py
168 150 11%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/random.py
346 329 5%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/re.py
153 125 18%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/shutil.py
619 600 3%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/socket.py
403 396 2%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/sre_compile.py
401 151 62%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/sre_parse.py
758 460 39%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/ssl.py
571 426 25%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/string.py
153 114 25%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/subprocess.py
794 671 15%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/sysconfig.py
376 246 35%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/tempfile.py
395 258 35%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/test/__init__.py
0 0 100%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/test/__main__.py
2 0 100%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/test/libregrtest/__init__.py
3 0 100%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/test/libregrtest/cmdline.py
127 52 59%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/test/libregrtest/main.py
335 163 51%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/test/libregrtest/refleak.py
186 122 34%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/test/libregrtest/runtest.py
146 62 58%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/test/libregrtest/save_env.py
189 68 64%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/test/libregrtest/setup.py
68 21 69%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/test/support/__init__.py
1289 902 30%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/test/test_exceptions.py
765 93 88%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/threading.py
575 572 1%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/tokenize.py
473 438 7%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/traceback.py
247 185 25%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/types.py
155 152 2%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/unittest/__init__.py
15 3 80%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/unittest/case.py
753 413 45%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/unittest/loader.py
295 226 23%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/unittest/main.py
149 122 18%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/unittest/result.py
128 66 48%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/unittest/runner.py
159 51 68%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/unittest/signals.py
47 33 30%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/unittest/suite.py
220 81 63%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/unittest/util.py
130 107 18%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/urllib/__init__.py
0 0 100%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/urllib/error.py
34 19 44%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/urllib/response.py
43 26 40%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/warnings.py
331 300 9%
/usr/local/pythonz/pythons/CPython-3.6.0/lib/python3.6/weakref.py
379 342 10%
--------------------------------------------------------------------------------------------------------------
TOTAL
26517 19743 26%
(issue29048)$
----------
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<http://bugs.python.org/issue29048>
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