Coverage fails on Python 3.6 Travis build

Issue #545 invalid
John Hagen created an issue

I updated support one of my packages to test on Python 3.6 with Travis. For some reason only on Python 3.6 I am getting a failure and return code 120.

Coverage version: coverage-4.3.1.tar.gz

The build:

The command used in the build:

python -Werror -Wignore::DeprecationWarning -m coverage run

Tests under Python 2.7, 3.3, 3.4, and 3.5 all pass successfully.

Comments (5)

  1. Ned Batchelder repo owner

    I don't know where the 120 comes from, but it doesn't seem to be from I tried the command used by travis. It displayed a mysterious error about the enum module (?), and then the tests passed, and the exit status was 120:

    $ python -Werror -Wignore::DeprecationWarning -m coverage run; echo Exited with $?
    'import warnings' failed; traceback:
    Traceback (most recent call last):
      File "/usr/local/virtualenvs/tmp-cd9a0f4d71ef3367/lib/python3.6/", line 505, in <module>
      File "/usr/local/virtualenvs/tmp-cd9a0f4d71ef3367/lib/python3.6/", line 186, in _processoptions
      File "/usr/local/virtualenvs/tmp-cd9a0f4d71ef3367/lib/python3.6/", line 192, in _setoption
        import re
      File "/usr/local/virtualenvs/tmp-cd9a0f4d71ef3367/lib/python3.6/", line 122, in <module>
        import enum
    ModuleNotFoundError: No module named 'enum'
    Ran 6 tests in 0.005s
    Exited with 120

    Then I tried removing the -W switches. No mysterious error, but still exit 120:

    $ python -m coverage run; echo Exited with $?
    Ran 6 tests in 0.005s
    Exited with 120

    Then I tried removing coverage from the command, and just running your It still exited with 120:

    $ python; echo Exited with $?
    Ran 6 tests in 0.003s
    Exited with 120

    I don't think this is about

  2. Ned Batchelder repo owner

    The 3.6 docs for sys.exit say:

    Changed in version 3.6: If an error occurs in the cleanup after the Python interpreter has caught SystemExit (such as an error flushing buffered data in the standard streams), the exit status is changed to 120.

    I have no idea why that is happening in your program.

  3. John Hagen reporter

    Thanks for your help Ned! Super strange, I'll try to track down the rest from here, thanks.

  4. John Hagen reporter

    The exit status 120 appears to be from this unit test:

    class ParseArgumentsTestCase(unittest.TestCase):
        def test_no_arguments(self):  # type: () -> None
            with self.assertRaises(SystemExit):
                # Suppress argparse stderr.
                class NullWriter:
                    def write(self, s):  # type: (str) -> None
                sys.stderr = NullWriter()

    Which is a crazy way I tried to test argparse input a while back. I removed it since it's really not of much value anyway and everything is fine now. Thanks for your help.

    I created an issue on the Python bug tracker to notify the core team, in case this particular effect was unintended:

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