Pyhash 0.9.3 does not install with more-itertools > 5.x

[sgrzemski]

Hi there,
I am experiencing issues installing pyhash when more-itertools over 5.x is installed:

(base) root@04931f9c4e76:/# pip install pyhash
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
Collecting pyhash
  Downloading https://files.pythonhosted.org/packages/f0/bf/4db9bed05d10824a17697f65063de19892ca2171a31a9c6854f9bbf55c02/pyhash-0.9.3.tar.gz (602kB)
     |████████████████████████████████| 604kB 3.2MB/s 
    ERROR: Command errored out with exit status 1:
     command: /opt/conda/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-x7aoCw/pyhash/setup.py'"'"'; __file__='"'"'/tmp/pip-install-x7aoCw/pyhash/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base pip-egg-info
         cwd: /tmp/pip-install-x7aoCw/pyhash/
    Complete output (403 lines):
      File "build/bdist.linux-x86_64/egg/_pytest/tmpdir.py", line 40
        def from_config(cls, config) -> "TempPathFactory":
                                     ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/runner.py", line 229
        def from_call(cls, func, when, reraise=None) -> "CallInfo":
                                                     ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/capture.py", line 245
        def _ensure_only_one_capture_fixture(request: FixtureRequest, name):
                                                    ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/pytester.py", line 159
        def _pytest(request: FixtureRequest) -> "PytestArg":
                           ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/_io/saferepr.py", line 15
        def _format_repr_exception(exc: BaseException, obj: Any) -> str:
                                      ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/outcomes.py", line 22
        def __init__(self, msg: Optional[str] = None, pytrace: bool = True) -> None:
                              ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/warning_types.py", line 84
        def simple(cls, apiname: str) -> "PytestExperimentalApiWarning":
                               ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/pathlib.py", line 37
        def get_lock_path(path: _AnyPurePath) -> _AnyPurePath:
                              ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/main.py", line 371
        def __missing__(self, path: str) -> str:
                                  ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/mark/structures.py", line 54
        def param(cls, *values, marks=(), id=None):
                                    ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/doctest.py", line 136
        self, reprlocation_lines: Sequence[Tuple[ReprFileLocation, Sequence[str]]]
                                ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/compat.py", line 57
        def _format_args(func: Callable[..., Any]) -> str:
                             ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/fixtures.py", line 701
        def formatrepr(self) -> "FixtureLookupErrorRepr":
                             ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/nodes.py", line 84
        parent: Optional["Node"] = None,
              ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/reports.py", line 47
        def toterminal(self, out) -> None:
                                  ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/cacheprovider.py", line 61
        def clear_cache(cls, cachedir: Path):
                                     ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/_code/source.py", line 30
        def __init__(self, *parts, **kwargs) -> None:
                                             ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/_code/code.py", line 50
        def __init__(self, rawcode) -> None:
                                    ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/config/argparsing.py", line 88
        def _getparser(self) -> "MyOptionParser":
                             ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/config/findpaths.py", line 112
        inifile: Optional[str],
               ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/config/__init__.py", line 61
        def main(args=None, plugins=None) -> "Union[int, _pytest.main.ExitCode]":
                                          ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/logging.py", line 42
        def __init__(self, terminalwriter, *args, **kwargs) -> None:
                                                            ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/python.py", line 283
        def reportinfo(self) -> Tuple[str, int, str]:
                             ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/resultlog.py", line 52
        print("{} {}".format(lettercode, testpath), file=self.logfile)
                                                        ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/assertion/util.py", line 46
        def _pformat_dispatch(object, indent=1, width=80, depth=None, *, compact=False):
                                                                       ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/assertion/rewrite.py", line 207
        def _is_marked_for_rewrite(self, name: str, state):
                                             ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/assertion/__init__.py", line 36
        def register_assert_rewrite(*names) -> None:
                                            ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/recwarn.py", line 60
        expected_warning: Union["Type[Warning]", Tuple["Type[Warning]", ...]],
                        ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/python_api.py", line 548
        expected_exception: Union["Type[_E]", Tuple["Type[_E]", ...]],
                          ^
    SyntaxError: invalid syntax
    
      File "build/bdist.linux-x86_64/egg/_pytest/terminal.py", line 156
        def pytest_configure(config: Config) -> None:
                                   ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/cacheprovider.py", line 61
        def clear_cache(cls, cachedir: Path):
                                     ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/capture.py", line 245
        def _ensure_only_one_capture_fixture(request: FixtureRequest, name):
                                                    ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/compat.py", line 57
        def _format_args(func: Callable[..., Any]) -> str:
                             ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/doctest.py", line 136
        self, reprlocation_lines: Sequence[Tuple[ReprFileLocation, Sequence[str]]]
                                ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/fixtures.py", line 701
        def formatrepr(self) -> "FixtureLookupErrorRepr":
                             ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/logging.py", line 42
        def __init__(self, terminalwriter, *args, **kwargs) -> None:
                                                            ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/main.py", line 371
        def __missing__(self, path: str) -> str:
                                  ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/nodes.py", line 84
        parent: Optional["Node"] = None,
              ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/outcomes.py", line 22
        def __init__(self, msg: Optional[str] = None, pytrace: bool = True) -> None:
                              ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/pathlib.py", line 37
        def get_lock_path(path: _AnyPurePath) -> _AnyPurePath:
                              ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/pytester.py", line 159
        def _pytest(request: FixtureRequest) -> "PytestArg":
                           ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/python.py", line 283
        def reportinfo(self) -> Tuple[str, int, str]:
                             ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/python_api.py", line 548
        expected_exception: Union["Type[_E]", Tuple["Type[_E]", ...]],
                          ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/recwarn.py", line 60
        expected_warning: Union["Type[Warning]", Tuple["Type[Warning]", ...]],
                        ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/reports.py", line 47
        def toterminal(self, out) -> None:
                                  ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/resultlog.py", line 52
        print("{} {}".format(lettercode, testpath), file=self.logfile)
                                                        ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/runner.py", line 229
        def from_call(cls, func, when, reraise=None) -> "CallInfo":
                                                     ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/terminal.py", line 156
        def pytest_configure(config: Config) -> None:
                                   ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/tmpdir.py", line 40
        def from_config(cls, config) -> "TempPathFactory":
                                     ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/warning_types.py", line 84
        def simple(cls, apiname: str) -> "PytestExperimentalApiWarning":
                               ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/_code/code.py", line 50
        def __init__(self, rawcode) -> None:
                                    ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/_code/source.py", line 30
        def __init__(self, *parts, **kwargs) -> None:
                                             ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/_io/saferepr.py", line 15
        def _format_repr_exception(exc: BaseException, obj: Any) -> str:
                                      ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/assertion/__init__.py", line 36
        def register_assert_rewrite(*names) -> None:
                                            ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/assertion/rewrite.py", line 207
        def _is_marked_for_rewrite(self, name: str, state):
                                             ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/assertion/util.py", line 46
        def _pformat_dispatch(object, indent=1, width=80, depth=None, *, compact=False):
                                                                       ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/config/__init__.py", line 61
        def main(args=None, plugins=None) -> "Union[int, _pytest.main.ExitCode]":
                                          ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/config/argparsing.py", line 88
        def _getparser(self) -> "MyOptionParser":
                             ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/config/findpaths.py", line 112
        inifile: Optional[str],
               ^
    SyntaxError: invalid syntax
    
      File "/tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg/_pytest/mark/structures.py", line 54
        def param(cls, *values, marks=(), id=None):
                                    ^
    SyntaxError: invalid syntax
    
    
    Installed /tmp/pip-install-x7aoCw/pyhash/.eggs/pytest-5.3.3-py2.7.egg
    Searching for py-cpuinfo
    Reading https://pypi.org/simple/py-cpuinfo/
    Downloading https://files.pythonhosted.org/packages/42/60/63f28a5401da733043abe7053e7d9591491b4784c4f87c339bf51215aa0a/py-cpuinfo-5.0.0.tar.gz#sha256=2cf6426f776625b21d1db8397d3297ef7acfa59018f02a8779123f3190f18500
    Best match: py-cpuinfo 5.0.0
    Processing py-cpuinfo-5.0.0.tar.gz
    Writing /tmp/easy_install-6llkwl/py-cpuinfo-5.0.0/setup.cfg
    Running py-cpuinfo-5.0.0/setup.py -q bdist_egg --dist-dir /tmp/easy_install-6llkwl/py-cpuinfo-5.0.0/egg-dist-tmp-CHNE33
    zip_safe flag not set; analyzing archive contents...
    cpuinfo.cpuinfo: module references __file__
    creating /tmp/pip-install-x7aoCw/pyhash/.eggs/py_cpuinfo-5.0.0-py2.7.egg
    Extracting py_cpuinfo-5.0.0-py2.7.egg to /tmp/pip-install-x7aoCw/pyhash/.eggs
    
    Installed /tmp/pip-install-x7aoCw/pyhash/.eggs/py_cpuinfo-5.0.0-py2.7.egg
    Searching for importlib-metadata>=0.12
    Reading https://pypi.org/simple/importlib-metadata/
    Downloading https://files.pythonhosted.org/packages/d7/31/74dcb59a601b95fce3b0334e8fc9db758f78e43075f22aeb3677dfb19f4c/importlib_metadata-1.4.0-py2.py3-none-any.whl#sha256=bdd9b7c397c273bcc9a11d6629a38487cd07154fa255a467bf704cd2c258e359
    Best match: importlib-metadata 1.4.0
    Processing importlib_metadata-1.4.0-py2.py3-none-any.whl
    Installing importlib_metadata-1.4.0-py2.py3-none-any.whl to /tmp/pip-install-x7aoCw/pyhash/.eggs
    writing requirements to /tmp/pip-install-x7aoCw/pyhash/.eggs/importlib_metadata-1.4.0-py2.7.egg/EGG-INFO/requires.txt
    
    Installed /tmp/pip-install-x7aoCw/pyhash/.eggs/importlib_metadata-1.4.0-py2.7.egg
    Searching for wcwidth
    Reading https://pypi.org/simple/wcwidth/
    Downloading https://files.pythonhosted.org/packages/58/b4/4850a0ccc6f567cc0ebe7060d20ffd4258b8210efadc259da62dc6ed9c65/wcwidth-0.1.8-py2.py3-none-any.whl#sha256=8fd29383f539be45b20bd4df0dc29c20ba48654a41e661925e612311e9f3c603
    Best match: wcwidth 0.1.8
    Processing wcwidth-0.1.8-py2.py3-none-any.whl
    Installing wcwidth-0.1.8-py2.py3-none-any.whl to /tmp/pip-install-x7aoCw/pyhash/.eggs
    
    Installed /tmp/pip-install-x7aoCw/pyhash/.eggs/wcwidth-0.1.8-py2.7.egg
    Searching for pluggy<1.0,>=0.12
    Reading https://pypi.org/simple/pluggy/
    Downloading https://files.pythonhosted.org/packages/a0/28/85c7aa31b80d150b772fbe4a229487bc6644da9ccb7e427dd8cc60cb8a62/pluggy-0.13.1-py2.py3-none-any.whl#sha256=966c145cd83c96502c3c3868f50408687b38434af77734af1e9ca461a4081d2d
    Best match: pluggy 0.13.1
    Processing pluggy-0.13.1-py2.py3-none-any.whl
    Installing pluggy-0.13.1-py2.py3-none-any.whl to /tmp/pip-install-x7aoCw/pyhash/.eggs
    writing requirements to /tmp/pip-install-x7aoCw/pyhash/.eggs/pluggy-0.13.1-py2.7.egg/EGG-INFO/requires.txt
    
    Installed /tmp/pip-install-x7aoCw/pyhash/.eggs/pluggy-0.13.1-py2.7.egg
    Searching for more-itertools>=4.0.0
    Reading https://pypi.org/simple/more-itertools/
    Downloading https://files.pythonhosted.org/packages/df/8c/c278395367a46c00d28036143fdc6583db8f98622b83875403f16473509b/more-itertools-8.1.0.tar.gz#sha256=c468adec578380b6281a114cb8a5db34eb1116277da92d7c46f904f0b52d3288
    Best match: more-itertools 8.1.0
    Processing more-itertools-8.1.0.tar.gz
    Writing /tmp/easy_install-x591sI/more-itertools-8.1.0/setup.cfg
    Running more-itertools-8.1.0/setup.py -q bdist_egg --dist-dir /tmp/easy_install-x591sI/more-itertools-8.1.0/egg-dist-tmp-qIKVLX
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-x7aoCw/pyhash/setup.py", line 164, in <module>
        use_2to3=True)
      File "/opt/conda/lib/python2.7/site-packages/setuptools/__init__.py", line 144, in setup
        _install_setup_requires(attrs)
      File "/opt/conda/lib/python2.7/site-packages/setuptools/__init__.py", line 139, in _install_setup_requires
        dist.fetch_build_eggs(dist.setup_requires)
      File "/opt/conda/lib/python2.7/site-packages/setuptools/dist.py", line 717, in fetch_build_eggs
        replace_conflicting=True,
      File "/opt/conda/lib/python2.7/site-packages/pkg_resources/__init__.py", line 782, in resolve
        replace_conflicting=replace_conflicting
      File "/opt/conda/lib/python2.7/site-packages/pkg_resources/__init__.py", line 1065, in best_match
        return self.obtain(req, installer)
      File "/opt/conda/lib/python2.7/site-packages/pkg_resources/__init__.py", line 1077, in obtain
        return installer(requirement)
      File "/opt/conda/lib/python2.7/site-packages/setuptools/dist.py", line 784, in fetch_build_egg
        return cmd.easy_install(req)
      File "/opt/conda/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 679, in easy_install
        return self.install_item(spec, dist.location, tmpdir, deps)
      File "/opt/conda/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 705, in install_item
        dists = self.install_eggs(spec, download, tmpdir)
      File "/opt/conda/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 890, in install_eggs
        return self.build_and_install(setup_script, setup_base)
      File "/opt/conda/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1158, in build_and_install
        self.run_setup(setup_script, setup_base, args)
      File "/opt/conda/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1144, in run_setup
        run_setup(setup_script, args)
      File "/opt/conda/lib/python2.7/site-packages/setuptools/sandbox.py", line 253, in run_setup
        raise
      File "/opt/conda/lib/python2.7/contextlib.py", line 35, in __exit__
        self.gen.throw(type, value, traceback)
      File "/opt/conda/lib/python2.7/site-packages/setuptools/sandbox.py", line 195, in setup_context
        yield
      File "/opt/conda/lib/python2.7/contextlib.py", line 35, in __exit__
        self.gen.throw(type, value, traceback)
      File "/opt/conda/lib/python2.7/site-packages/setuptools/sandbox.py", line 166, in save_modules
        saved_exc.resume()
      File "/opt/conda/lib/python2.7/site-packages/setuptools/sandbox.py", line 141, in resume
        six.reraise(type, exc, self._tb)
      File "/opt/conda/lib/python2.7/site-packages/setuptools/sandbox.py", line 154, in save_modules
        yield saved
      File "/opt/conda/lib/python2.7/site-packages/setuptools/sandbox.py", line 195, in setup_context
        yield
      File "/opt/conda/lib/python2.7/site-packages/setuptools/sandbox.py", line 250, in run_setup
        _execfile(setup_script, ns)
      File "/opt/conda/lib/python2.7/site-packages/setuptools/sandbox.py", line 45, in _execfile
        exec(code, globals, locals)
      File "/tmp/easy_install-x591sI/more-itertools-8.1.0/setup.py", line 5, in <module>
        import math
      File "/tmp/easy_install-x591sI/more-itertools-8.1.0/more_itertools/__init__.py", line 1, in <module>
      File "/tmp/easy_install-x591sI/more-itertools-8.1.0/more_itertools/more.py", line 480
        yield from iterable
                 ^
    SyntaxError: invalid syntax
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

When downgrading more-itertools to 5.0 pyhash installs flawless:

(base) root@04931f9c4e76:/# pip install more-itertools==5.0
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
Collecting more-itertools==5.0
  Downloading https://files.pythonhosted.org/packages/2f/9d/dcfe59e213093695f108508af1214cf9cd95cc5489e46877ec5cb56369e5/more_itertools-5.0.0-py2-none-any.whl (52kB)
     |████████████████████████████████| 61kB 2.3MB/s 
Requirement already satisfied: six<2.0.0,>=1.0.0 in /opt/conda/lib/python2.7/site-packages (from more-itertools==5.0) (1.12.0)
Installing collected packages: more-itertools
Successfully installed more-itertools-5.0.0
(base) root@04931f9c4e76:/# pip install pyhash
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
Collecting pyhash
  Using cached https://files.pythonhosted.org/packages/f0/bf/4db9bed05d10824a17697f65063de19892ca2171a31a9c6854f9bbf55c02/pyhash-0.9.3.tar.gz
Building wheels for collected packages: pyhash
  Building wheel for pyhash (setup.py) ... done
  Created wheel for pyhash: filename=pyhash-0.9.3-cp27-cp27mu-linux_x86_64.whl size=2994264 sha256=47860d256742367073c2009f0e3345798df92b8840fa8e88b3a48a2d154ec9f1
  Stored in directory: /root/.cache/pip/wheels/0b/6d/31/936fd0c841c52f7afcb77290e2de18fd04d88325853787b36e
Successfully built pyhash
Installing collected packages: pyhash
Successfully installed pyhash-0.9.3

[twm]

I'm seeing the same issue over on ciena/afkak#110.

Analysis

The root of this is that a bunch of pyhash's transitive install-time (setup_requires) dependencies have dropped Python 2.7 support. The setup_requires mechanism basically installs stuff using setuptools easy_install, rather than Pip. easy_install doesn't know about Requires-Python (PEP 345), so it tries to install a bunch of packages in spite of this metadata.

It looks like the easiest way to fix this is to move away from pytest-runner. Its maintainers have deprecated it, essentially exactly for this reason. You'd start by deleting these lines:

pyfasthash/setup.py

Lines 238 to 239 in 5f81262

	setup_requires=['pytest-runner', 'pytest-benchmark'],
	tests_require=['pytest'],

The current Tox config installs these test dependencies:

pyfasthash/tests/requirements.txt

Lines 1 to 4 in 5f81262

	pytest >= 4.6
	pytest-benchmark >= 3.2
	pytest-cov >= 2.7
	codecov >= 2.0

That should work, but if you were still getting the wrong pytest version you can add an additional constraint like:

pytest <5.0; python_version<"3.0"

Another option is to ship Python 2.7 wheels for more platforms so that setup.py is never run. This is, admittedly, quite a lot of work. argon2-cffi is a fully worked example of this.

Workarounds

As a user of the library, we can work around these issues by ensuring that Python 2.7-compatible versions of these libraries are installed before pyhash. For example, you could add a Python 2.7-qualified dep in tox.ini:

[testenv]
deps =
    {py27,pypy}: pytest-runner
    {py27,pypy}: pytest-benchmark

Here's a real-world example: ciena/afkak@8c7bd8a

[sgrzemski]

Whoa, nice analysis. Much appreciated, thanks!