tests fail on python 3.8

[eli-schwartz]

==> Starting check()...
============================= test session starts ==============================
platform linux -- Python 3.8.0, pytest-5.2.2, py-1.8.0, pluggy-0.13.0
rootdir: /build/python-dephell-discover/src/dephell_discover-0.2.8
collected 27 items

tests/test_metainfo.py FFFFF.                                            [ 22%]
tests/test_root.py .....................                                 [100%]

=================================== FAILURES ===================================
__________________ test_vars[__license__ = "MIT"-license-MIT] __________________

tmp_path = PosixPath('/tmp/pytest-of-builduser/pytest-0/test_vars___license______MIT__0')
content = '__license__ = "MIT"', name = 'license', expected = 'MIT'

    @pytest.mark.parametrize('content, name, expected', [
        ('__license__ = "MIT"', 'license', 'MIT'),
    
        ('__version__ = "0.2.7"', 'version', '0.2.7'),
        ('__version__ = ("0", "2", "7")', 'version', '0.2.7'),
        # ('__version__ = (0, 2, 7)', 'version', '0.2.7'),
    
        ('__author__ = "Gram"', 'authors', ['Gram']),
        ('__authors__ = ["Gram"]', 'authors', ['Gram']),
    
    ])
    def test_vars(tmp_path: Path, content: str, name: str, expected):
        path = tmp_path / 'lol.py'
        path.write_text(content)
        info = MetaInfo.parse(paths=[path])
>       assert getattr(info, name) == expected
E       AssertionError: assert None == 'MIT'
E        +  where None = getattr(MetaInfo(lines=[]), 'license')

tests/test_metainfo.py:23: AssertionError
________________ test_vars[__version__ = "0.2.7"-version-0.2.7] ________________

tmp_path = PosixPath('/tmp/pytest-of-builduser/pytest-0/test_vars___version______0_2_70')
content = '__version__ = "0.2.7"', name = 'version', expected = '0.2.7'

    @pytest.mark.parametrize('content, name, expected', [
        ('__license__ = "MIT"', 'license', 'MIT'),
    
        ('__version__ = "0.2.7"', 'version', '0.2.7'),
        ('__version__ = ("0", "2", "7")', 'version', '0.2.7'),
        # ('__version__ = (0, 2, 7)', 'version', '0.2.7'),
    
        ('__author__ = "Gram"', 'authors', ['Gram']),
        ('__authors__ = ["Gram"]', 'authors', ['Gram']),
    
    ])
    def test_vars(tmp_path: Path, content: str, name: str, expected):
        path = tmp_path / 'lol.py'
        path.write_text(content)
        info = MetaInfo.parse(paths=[path])
>       assert getattr(info, name) == expected
E       AssertionError: assert None == '0.2.7'
E        +  where None = getattr(MetaInfo(lines=[]), 'version')

tests/test_metainfo.py:23: AssertionError
____________ test_vars[__version__ = ("0", "2", "7")-version-0.2.7] ____________

tmp_path = PosixPath('/tmp/pytest-of-builduser/pytest-0/test_vars___version_______0___0')
content = '__version__ = ("0", "2", "7")', name = 'version', expected = '0.2.7'

    @pytest.mark.parametrize('content, name, expected', [
        ('__license__ = "MIT"', 'license', 'MIT'),
    
        ('__version__ = "0.2.7"', 'version', '0.2.7'),
        ('__version__ = ("0", "2", "7")', 'version', '0.2.7'),
        # ('__version__ = (0, 2, 7)', 'version', '0.2.7'),
    
        ('__author__ = "Gram"', 'authors', ['Gram']),
        ('__authors__ = ["Gram"]', 'authors', ['Gram']),
    
    ])
    def test_vars(tmp_path: Path, content: str, name: str, expected):
        path = tmp_path / 'lol.py'
        path.write_text(content)
        info = MetaInfo.parse(paths=[path])
>       assert getattr(info, name) == expected
E       AssertionError: assert None == '0.2.7'
E        +  where None = getattr(MetaInfo(lines=[]), 'version')

tests/test_metainfo.py:23: AssertionError
_______________ test_vars[__author__ = "Gram"-authors-expected3] _______________

tmp_path = PosixPath('/tmp/pytest-of-builduser/pytest-0/test_vars___author______Gram__0')
content = '__author__ = "Gram"', name = 'authors', expected = ['Gram']

    @pytest.mark.parametrize('content, name, expected', [
        ('__license__ = "MIT"', 'license', 'MIT'),
    
        ('__version__ = "0.2.7"', 'version', '0.2.7'),
        ('__version__ = ("0", "2", "7")', 'version', '0.2.7'),
        # ('__version__ = (0, 2, 7)', 'version', '0.2.7'),
    
        ('__author__ = "Gram"', 'authors', ['Gram']),
        ('__authors__ = ["Gram"]', 'authors', ['Gram']),
    
    ])
    def test_vars(tmp_path: Path, content: str, name: str, expected):
        path = tmp_path / 'lol.py'
        path.write_text(content)
        info = MetaInfo.parse(paths=[path])
>       assert getattr(info, name) == expected
E       AssertionError: assert [] == ['Gram']
E         Right contains one more item: 'Gram'
E         Use -v to get the full diff

tests/test_metainfo.py:23: AssertionError
_____________ test_vars[__authors__ = ["Gram"]-authors-expected4] ______________

tmp_path = PosixPath('/tmp/pytest-of-builduser/pytest-0/test_vars___authors_______Gram0')
content = '__authors__ = ["Gram"]', name = 'authors', expected = ['Gram']

    @pytest.mark.parametrize('content, name, expected', [
        ('__license__ = "MIT"', 'license', 'MIT'),
    
        ('__version__ = "0.2.7"', 'version', '0.2.7'),
        ('__version__ = ("0", "2", "7")', 'version', '0.2.7'),
        # ('__version__ = (0, 2, 7)', 'version', '0.2.7'),
    
        ('__author__ = "Gram"', 'authors', ['Gram']),
        ('__authors__ = ["Gram"]', 'authors', ['Gram']),
    
    ])
    def test_vars(tmp_path: Path, content: str, name: str, expected):
        path = tmp_path / 'lol.py'
        path.write_text(content)
        info = MetaInfo.parse(paths=[path])
>       assert getattr(info, name) == expected
E       AssertionError: assert [] == ['Gram']
E         Right contains one more item: 'Gram'
E         Use -v to get the full diff

tests/test_metainfo.py:23: AssertionError
========================= 5 failed, 22 passed in 1.95s =========================

Broken due to use of ast.Str, which doesn't match type checks any more due to https://bugs.python.org/issue32892

Used here:

dephell_discover/dephell_discover/_line.py

Line 56 in 95eaa39

if type(value) is ast.Str:

dephell_discover/dephell_discover/_line.py

Line 68 in 95eaa39

if type(element) is not ast.Str:

P.S. Why does this use type(foo) is bar instead of isinstance(foo, bar)?