Issue #410: Tests fail with Python 3.8 (blais/beancount)

[Dr. Tobias Quathamer]

New issue 410: Tests fail with Python 3.8
https://bitbucket.org/blais/beancount/issues/410/tests-fail-with-python-38

Dr. Tobias Quathamer:

Hi,

I’m helping to maintain the Debian package of beancount, and the tests have recently begun to fail, after we switched from Python 3.7 to Python 3.8. You can see the full build log here:

[https://buildd.debian.org/status/fetch.php?pkg=beancount&arch=amd64&ver=2.2.3-1%2Bb1&stamp=1574207855&raw=0](https://buildd.debian.org/status/fetch.php?pkg=beancount&arch=amd64&ver=2.2.3-1%2Bb1&stamp=1574207855&raw=0)

The first failing test is this:

`beancount/ingest/identify_test.py::TestScriptIdentify::test_identify FAILED [ 20%]`

Afterwards, the tests break with a segmentation fault error:

```
beancount/parser/lexer_test.py::TestLexerErrors::test_lexer_invalid_token PASSED [ 55%]
beancount/parser/lexer_test.py::TestLexerUnicode::test_bytes_encoded_latin1 PASSED [ 55%]
beancount/parser/lexer_test.py::TestLexerUnicode::test_bytes_encoded_latin1_invalid PASSED [ 55%]
beancount/parser/lexer_test.py::TestLexerUnicode::test_bytes_encoded_utf16 Segmentation fault
E: pybuild pybuild:341: test: plugin distutils failed with: exit code=139: cd /<<PKGBUILDDIR>>/.pybuild/cpython3_3.8/build; python3.8 -m pytest -v
dh_auto_test: pybuild --test --test-pytest -i python{version} -p "3.8 3.7" returned exit code 13
make: *** [debian/rules:13: binary-arch] Error 255
dpkg-buildpackage: error: debian/rules binary-arch subprocess returned exit status 2
```

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The corresponding bug in Debian is [https://bugs.debian.org/943608](https://bugs.debian.org/943608), however, there’s not much information in the bug log \(yet\). Could you please take a look at this?

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Regards,

Tobias