Poetry: Poetry does not work on Python 3.5.2

[cole]

• [x] I am on the latest Poetry version.
• [x] I have searched the issues of this repo and believe that this is not a duplicate.
• [x] If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: OS X, Python docker images
• Poetry version: 1.0.0
• Link of a Gist with the contents of your pyproject.toml file: https://raw.githubusercontent.com/cole/aiosmtplib/master/pyproject.toml

Issue

poetry install fails on version 3.5.2:

$ poetry install -v
Traceback (most recent call last):
  File "/root/.tox/py35-asyncio/bin/poetry", line 7, in <module>
    from poetry.console import main
  File "/root/.tox/py35-asyncio/lib/python3.5/site-packages/poetry/console/__init__.py", line 1, in <module>
    from .application import Application
  File "/root/.tox/py35-asyncio/lib/python3.5/site-packages/poetry/console/application.py", line 1, in <module>
    from cleo import Application as BaseApplication
  File "/root/.tox/py35-asyncio/lib/python3.5/site-packages/cleo/__init__.py", line 3, in <module>
    from .application import Application
  File "/root/.tox/py35-asyncio/lib/python3.5/site-packages/cleo/application.py", line 4, in <module>
    from clikit.console_application import ConsoleApplication
  File "/root/.tox/py35-asyncio/lib/python3.5/site-packages/clikit/__init__.py", line 1, in <module>
    from .api.config.application_config import ApplicationConfig
  File "/root/.tox/py35-asyncio/lib/python3.5/site-packages/clikit/api/config/__init__.py", line 1, in <module>
    from .application_config import ApplicationConfig
  File "/root/.tox/py35-asyncio/lib/python3.5/site-packages/clikit/api/config/application_config.py", line 6, in <module>
    from typing import ContextManager
ImportError: cannot import name 'ContextManager'

The cause of this issue seems to be in clikit. It's also tracked in that repo: https://github.com/sdispater/clikit/issues/7.

Likely an issue on 3.5.0-3.5.3, however 3.5.2 is the most commonly used of those versions.

[MadWombat]

Also, 3.5.2 is the default python on Ubuntu Xenial. Xenial is an LTS release with end of life in 2024, so python 3.5.2 will be around for a while.

[rvanlaar]

We're getting hit by this issue right now, what's that status of this issue?

As in, how can I help to move this forward?

[rvanlaar]

Would a pull request help and be accepted, once CliKit has a new release?

And say a PR was made and accepted. How long would it take for a new point release to be made?

[rvanlaar]

A fix was released today.

This issue in Clikit was merged today: https://github.com/sdispater/clikit/pull/8
This fix is included in the version 0.4.2 of clikit, that was just released.
Installed poetry on python3.5.2 with pip3 install poetry.

I'm not seeing any problems while installing our package with: poetry install.

[cole]

Fixed now with the release of clikit 0.4.2.