Poetry: Can't use poetry in several pre-release versions

[Cgironalas]

• [ ] 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: Linux Mint 19.1 Cinnamon
• Poetry version: 1.0.0a2, 1.0.0a3, 1.0.0a4, 1.0.0a5, 1.0.0b1, 1.0.0b2
• Link of a Gist with the contents of your pyproject.toml file: I have no specific gist to show but even in a sandbox, in a new virtual environment with only poetry having been pip installed the error happens.

Issue

I have been having issues when trying to use poetry in general when using python 3.7.4 and any of the poetry versions mentioned. Whenever I try to run poetry I get the following error:
ImportError: cannot import name 'ConsoleEvents' from 'clikit.api.event' (/home/carlos/sandbox/python_stuff/poetry_error/.env/lib/python3.7/site-packages/clikit/api/event/__init__.py).

But the error is not present in versions 1.0.0a0 nor in version 1.0.0b3.

Steps to get the error in a sandbox:

• python -m venv venv
• source venv/bin/activate
• pip install poetry==1.0.0b2
• poetry

[bersace]

Same here. I had to pin cleo to 0.7.5 as a workaround.

https://gitlab.com/dalibo/dramatiq-pg/commit/51682b5097a8ddd3445eb9c8d15e73c08601c367

[sdispater]

You should use the 1.0.0b3 version which properly sets the clikit dependency and fixes the issue.

If you absolutely need to use a previous prerelease then downgrading cleo like @bersace mentioned should work as a temporary fix.