Support for python3 #332
Support for python3 #332
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| @@ -1,22 +1,20 @@ | |||
| language: python | |||
| python: | |||
| - "2.7" | |||
| - "3.6" | |||
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Travis now exercises tests under both 2.7 and 3.6
All tests pass like before this change under 2.7
Under 3.6, a few tests are currently skipped because I'm not sure how to fix them
So end result after this commit should be:
- 2.7 should behave the same as before
- 3.6 has probably a few bugs to iron out, no tests should be skipped because of 3.6 before we can call it really ready for python3
| All tests pass with both python2 and python3, however, a few test cases are disabled currently for python3, spot then with: | ||
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| ```bash | ||
| grep -r 'reason="TODO python3' . |
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Search for TODO python3 to see what still needs to be examined for python3 (all relevant parts of the code were marked with this, everything else I'm pretty sure is good to go)
| :target: https://ci.appveyor.com/project/li-zhi/vmaf | ||
| :alt: AppVeyor Build Status | ||
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| VMAF is a perceptual video quality assessment algorithm developed by Netflix. |
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This is just a placeholder README, there was no README before in this folder, I added one to make setup.py be closer to what it would eventually need to be if we one day publish this to pypi.
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| numpy | |||
| # TODO python3: scipy 1.3.0 removed some previously deprecated functions, still used by vmaf | |||
| scipy>=0.17.1,<1.3.0 | |||
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scipy change is indirectly related to py3
Their latest version 1.3.0 is python3 only (they dropped support for python2).
See https://github.com/scipy/scipy/blob/master/setup.py#L490 (python_requires='>=3.5')
This makes it so that vmaf picks up scipy 1.2.1 (because that's the latest version it can pick up...), but python3 ends up getting 1.3.0, where they dropped some previously deprecated functions.
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| if __name__ == "__main__": | ||
| main() |
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This is not directly related to py3... but it creates confusion (in the doctest module actually) because of code executed immediately at import time.
I changed nothing here, except to make sure code doesn't get executed at import time.
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Thanks. Good catch.
Curious: how did you find this file? Do you have some analysis tool or you just did spot check?
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pytest --doctest-modules found it actually -> it was hitting this because it tries to simply import the module (in order to scour it for doctests), and this one was trying to run immediately at import time, and failing.
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| __copyright__ = "Copyright 2016-2018, Netflix, Inc." | |||
| __license__ = "Apache, Version 2.0" | |||
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| class TestLibRunner(VmafossExecQualityRunner): | |||
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| class LibRunner(VmafossExecQualityRunner): | |||
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Renamed to LibRunner because otherwise TestLibRunner issues a warning that this is not a valid test case (which it isn't supposed to be... it's just that class prefix Test seems to imply that it is by convention...)
| @@ -28,7 +28,7 @@ def test_with(self): | |||
| height=324, | |||
| yuv_type='yuv420p' | |||
| ) as yuv_reader: | |||
| self.assertEquals(yuv_reader.file.__class__, file) | |||
| assert hasattr(yuv_reader.file, "read") | |||
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There is no more type file in python3
| @@ -113,7 +113,7 @@ def test_to_score_str(self): | |||
| self.result.set_score_aggregate_method(ListStats.total_variation) | |||
| self.assertAlmostEquals(self.result.get_result('VMAF_legacy_score'), 6.5901873052628375, places=4) | |||
| self.result.set_score_aggregate_method(partial(ListStats.moving_average, n=2)) | |||
| self.assertItemsEqual(self.result.get_result('VMAF_legacy_score'), | |||
| self.assertEqual(list(self.result.get_result('VMAF_legacy_score')), | |||
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A few of those assertSomething methods were removed in python3's unittest...
The consensus is roughly that there are too many of them, they're a lot java-like, and don't really provide much value...
With a modern test runner (like pytest), you don't need this at all.
A simple assert a == b will usually be sufficient (you will get a diff output of the difference too, no need for elaborate functions)
| -rtest/requirements.txt | ||
| # TODO: way too many warnings in tests, remove `-p no:warnings` and get rid of them all | ||
| commands = pytest {posargs:-vv -p no:warnings -m {env:TEST_MARKER:main} --doctest-modules --cov-report term-missing --cov=src/} | ||
| # python -m unittest discover -s test/ -p '*_test.py' |
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One can simply comment the pytest line here, and uncomment the unittest one to switch to unittest to exercise the tests
| markers = | ||
| main: Main tests (exludes 'extra' and 'lib') | ||
| extra: Exercise test/extra/ (requires ffmpeg installed) | ||
| lib: Exercise test/lib/ (requires testlib installed). |
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These just define all the markers used, pytest --markers would show those 3 (with their description), it's like a relatively common practice to declare them like this.
pytest looks at the following file for configuration (in that order): pytest.ini, tox.ini, setup.cfg
Adapted code for python3, exercise tests in both python2 and python3