Poetry: Error when adding package: EmptyConstraint instance has no attribute 'min'

[bi1yeu]

• [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: macOS 10.13.6
• Poetry version: 0.12.3
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/bi1yeu/41b2180afd838560daa0faf68e9c236b

Issue

Hi! This is my first time attempting to use poetry. I created a new empty project with this command:

$ poetry new example

Then, from within the example directory, I attempt to add the jupyter package:

$ poetry add jupyter
Using version ^1.0 for jupyter

Updating dependencies
Resolving dependencies... (4.0s)

[AttributeError]
EmptyConstraint instance has no attribute 'min'

add [-D|--dev] [--git GIT] [--path PATH] [-E|--extras EXTRAS] [--optional] [--python PYTHON] [--platform PLATFORM] [--allow-prereleases] [--dry-run] [--] <name> (<name>)...

Verbose output is contained within the gist linked above. I am able to add other packages without apparent error. Happy to provide additional info.

[bi1yeu]

Update: When I use pyenv to explicitly set the local Python version to 3 (I tried both 3.6.5 and 3.7.0), I _am_ able to add the jupyter package.

$ poetry new example
$ cd example
$ pyenv local 3.6.5
$ poetry add jupyter # installs fine

This fails with the same AttributeError as above if I instead use pyenv local 2.7.10.

I can install jupyter directly using pip and Python 2.7:

$ mkdir example
$ cd example
$ pyenv local 2.7.10
$ python -m pip install --upgrade pip
$ python -m pip install jupyter # installs fine

[sdispater]

There was an issue when parsing some transitive markers. It has been fixed in commit 7761867

[sdispater]

This has been fixed in the latest release.

[bi1yeu]

Thank you!

On Mon, Oct 22, 2018 at 7:08 PM Sébastien Eustace [e-mail]
wrote:

Closed #534 https://github.com/sdispater/poetry/issues/534.

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[flaviut]

I think there's been a regression here; I get the same error with 0.12.16:

```console
$ poetry -V
Poetry 0.12.16
$ poetry add jupyter

[AttributeError]
'EmptyConstraint' object has no attribute 'min'

add [-D|--dev] [--git GIT] [--path PATH] [-E|--extras EXTRAS] [--optional] [--python PYTHON] [--platform PLATFORM] [--allow-prereleases] [--dry-run] [--] ()...

[bnoctis]

Got the same error with 0.12.17 & Python version 3.7.4; same prompt as @flaviut 's comment.

It seems to be create_nested_marker() missing EmptyConstraint when checking the type of constraint. Manual patching ~/.poetry/lib/poetry/packages/utils/utils.py to import poetry.semver.empty_constraint.EmptyConstraint and add it to check list said above solved the problem locally.

[agilgur5]

Also getting this error with Poetry 0.12.17. Can we re-open this issue?

@mwoyuan to which check (line #?) did you add EmptyConstraint? Maybe submit a PR if you were able to patch it?
EDIT: added EmptyConstraint import after line 9:

from poetry.semver import Version
from poetry.semver import VersionUnion
from poetry.semver.empty_constraint import EmptyConstraint  # this line is new

and a new if statement after line 206/207:

    elif isinstance(constraint, Version):
        marker = '{} == "{}"'.format(name, constraint.text)
    elif isinstance(constraint, EmptyConstraint):  # and this line
        marker = ''  # and this one
    else:

And now it seems to work ok

[laike9m]

Met this issue on Poetry 1.0.3 + Python 3.7.4

[andreoliwa]

I'm having the same error on Poetry 1.0.9.

The package I'm trying (AuHau/toggl-cli) has:

python_requires = >=3.6.0, <3.9.0

This is my debug info, and a gist below with pyproject.toml and the full error log.

Poetry
Version: 1.0.9
Python:  3.8.3

Virtualenv
Python:         3.8.3
Implementation: CPython
Path:           /Users/wagneraugusto/Library/Caches/pypoetry/virtualenvs/toggl-cli-bug-t9z0mPRw-py3.8
Valid:          True

System
Platform: darwin
OS:       posix
Python:   /Users/wagneraugusto/.pyenv/versions/3.8.3

Poetry [AttributeError] 'EmptyConstraint' object has no attribute 'min'