Fail to import typing while running test which runs process which imports typing from setup.py with pytest in python 3.7

[ThomasHickman]

setup.py

from setuptools import setup

setup(
    setup_requires=['pytest-runner'],
    install_requires=[
        'typing',
        "pytest"
    ]
)

test_test.py

import subprocess

subprocess.check_call(["python", "-c", "import typing"])

$ docker run --rm -it -w /pwd -v $(pwd):/pwd python:3.7 python setup.py pytest
running pytest
Searching for pytest
Best match: pytest 3.6.3
Processing pytest-3.6.3-py3.7.egg

Using /pwd/.eggs/pytest-3.6.3-py3.7.egg
Searching for typing
Best match: typing 3.6.4
Processing typing-3.6.4-py3.7.egg

Using /pwd/.eggs/typing-3.6.4-py3.7.egg
Searching for six>=1.10.0
Best match: six 1.11.0
Processing six-1.11.0-py3.7.egg

Using /pwd/.eggs/six-1.11.0-py3.7.egg
Searching for py>=1.5.0
Best match: py 1.5.4
Processing py-1.5.4-py3.7.egg

Using /pwd/.eggs/py-1.5.4-py3.7.egg
Searching for pluggy<0.7,>=0.5
Best match: pluggy 0.6.0
Processing pluggy-0.6.0-py3.7.egg

Using /pwd/.eggs/pluggy-0.6.0-py3.7.egg
Searching for more-itertools>=4.0.0
Best match: more-itertools 4.2.0
Processing more_itertools-4.2.0-py3.7.egg

Using /pwd/.eggs/more_itertools-4.2.0-py3.7.egg
Searching for attrs>=17.4.0
Best match: attrs 18.1.0
Processing attrs-18.1.0-py3.7.egg

Using /pwd/.eggs/attrs-18.1.0-py3.7.egg
Searching for atomicwrites>=1.0
Best match: atomicwrites 1.1.5
Processing atomicwrites-1.1.5-py3.7.egg

Using /pwd/.eggs/atomicwrites-1.1.5-py3.7.egg
running egg_info
writing UNKNOWN.egg-info/PKG-INFO
writing dependency_links to UNKNOWN.egg-info/dependency_links.txt
writing requirements to UNKNOWN.egg-info/requires.txt
writing top-level names to UNKNOWN.egg-info/top_level.txt
reading manifest file 'UNKNOWN.egg-info/SOURCES.txt'
writing manifest file 'UNKNOWN.egg-info/SOURCES.txt'
running build_ext
============================================ test session starts ============================================
platform linux -- Python 3.7.0, pytest-3.6.3, py-1.5.4, pluggy-0.6.0
rootdir: /pwd, inifile:
collected 0 items / 1 errors

================================================== ERRORS ===================================================
____________________________________ ERROR collecting tests/test_test.py ____________________________________
tests/test_test.py:3: in <module>
    subprocess.check_call(["python", "-c", "import typing"])
/usr/local/lib/python3.7/subprocess.py:328: in check_call
    raise CalledProcessError(retcode, cmd)
E   subprocess.CalledProcessError: Command '['python', '-c', 'import typing']' returned non-zero exit status 1.
---------------------------------------------- Captured stderr ----------------------------------------------
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/pwd/.eggs/typing-3.6.4-py3.7.egg/typing.py", line 1347, in <module>
    class Callable(extra=collections_abc.Callable, metaclass=CallableMeta):
  File "/pwd/.eggs/typing-3.6.4-py3.7.egg/typing.py", line 1003, in __new__
    self._abc_registry = extra._abc_registry
AttributeError: type object 'Callable' has no attribute '_abc_registry'
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Interrupted: 1 errors during collection !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
========================================== 1 error in 0.59 seconds ==========================================

I've used docker, to make this error more reproducible but this errors outside docker as well

[JelleZijlstra]

You don't need to install the backport on 3.7, because typing is in the standard library since 3.5. I suspect you need a requirement like 'typing; python_version < '3.5'.

[ThomasHickman]

@JelleZijlstra, that would work, thanks. It would be nice if this worked using this backport anyway, if this backport is installed by a package not under my control.

Also, if it is not suggested for people to install this backport under newer versions of python, should there be a warning on installation of this package with newer versions of python?

[srittau]

All supported Python versions now include the typing module, making the backport obsolete. I don't think we need to keep this open.