"env use" fails with "NameError: name 'PosixPath' is not defined"

• I am on the latest Poetry version.

• I have searched the issues of this repo and believe that this is not a duplicate.

• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Ubuntu 18.04.4 LTS

• Poetry version: 1.0.10

Issue

When I try the following command,

poetry env use 3.8

it will fail with the following message:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'PosixPath' is not defined

I guess this is caused by the following line. https://github.com/python-poetry/poetry/blob/d3c9049a18ae33baacfcb5c698777282f2f58128/poetry/utils/env.py#L625 Variable venv is a Path object, and it is finally passed to str.format() https://github.com/python-poetry/poetry/blob/d3c9049a18ae33baacfcb5c698777282f2f58128/poetry/utils/env.py#L672 Then CREATE_VENV_COMMAND is https://github.com/python-poetry/poetry/blob/d3c9049a18ae33baacfcb5c698777282f2f58128/poetry/utils/env.py#L105-L106

$ python -c 'import pathlib; print("{!r}".format(pathlib.Path("/")))'
PosixPath('/')

So the interpreter will first read a line like path = PosixPath('...') but PosixPath is not defined.

I think this bug is introduced in 1.0.10 https://github.com/python-poetry/poetry/commit/54870697d921ae6efdbba0bc86f6b54c86d6896a

I guess it will be fixed by replacing venv to str(venv) so I tried to fix, but the commit above is replacing str(venv) to venv and I can’t understand the purpose to do so. I can’t fix it.

Thanks.

[alexlouden]

I had the same issue, upgrading to the latest preview version fixed it for me - thanks!

$ poetry self update --preview
Updating to 1.1.0b2

[tony]

Thanks @alexlouden

I had to do : pip install --user --pre poetry -U

Since my poetry installation gave me this warning: Poetry was not installed with the recommended installer. Cannot update automatically.