AssertionError from poetry add Naked

• 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: macOS 1015.3 Catalina

• Poetry version: 1.0.3

• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/shangxiao/50d1f8aa24157a14f759110b552df202

Issue

Running poetry add Naked results in an AssertionError

$ poetry add -vvv Naked
Using virtualenv: /Users/someuser/Library/Caches/pypoetry/virtualenvs/poetry-test-oO20IG-_-py3.6
PyPI: No release information found for Naked-0.1.9, skipping
PyPI: 19 packages found for Naked *
Using version ^0.1.31 for Naked

Updating dependencies
Resolving dependencies...
   1: fact: poetry-test is 0.1.0
   1: derived: poetry-test
   1: fact: poetry-test depends on Naked (^0.1.31)
   1: fact: poetry-test depends on pytest (^5.2)
   1: fact: poetry-test depends on pytest (^5.2)
   1: selecting poetry-test (0.1.0)
   1: derived: pytest (^5.2)
   1: derived: Naked (^0.1.31)
PyPI: 11 packages found for pytest >=5.2,<6.0
PyPI: No release information found for naked-0.1.9, skipping
PyPI: 1 packages found for naked >=0.1.31,<0.2.0
   1: Version solving took 0.030 seconds.
   1: Tried 1 solutions.

[AssertionError]


Traceback (most recent call last):
  File "/Users/someuser/.poetry/lib/poetry/_vendor/py3.6/clikit/console_application.py", line 131, in run
    status_code = command.handle(parsed_args, io)
  File "/Users/someuser/.poetry/lib/poetry/_vendor/py3.6/clikit/api/command/command.py", line 120, in handle
    status_code = self._do_handle(args, io)
  File "/Users/someuser/.poetry/lib/poetry/_vendor/py3.6/clikit/api/command/command.py", line 171, in _do_handle
    return getattr(handler, handler_method)(args, io, self)
  File "/Users/someuser/.poetry/lib/poetry/_vendor/py3.6/cleo/commands/command.py", line 92, in wrap_handle
    return self.handle()
  File "/Users/someuser/.poetry/lib/poetry/console/commands/add.py", line 149, in handle
    status = installer.run()
  File "/Users/someuser/.poetry/lib/poetry/installation/installer.py", line 74, in run
    self._do_install(local_repo)
  File "/Users/someuser/.poetry/lib/poetry/installation/installer.py", line 161, in _do_install
    ops = solver.solve(use_latest=self._whitelist)
  File "/Users/someuser/.poetry/lib/poetry/puzzle/solver.py", line 36, in solve
    packages, depths = self._solve(use_latest=use_latest)
  File "/Users/someuser/.poetry/lib/poetry/puzzle/solver.py", line 181, in _solve
    self._package, self._provider, locked=locked, use_latest=use_latest
  File "/Users/someuser/.poetry/lib/poetry/mixology/__init__.py", line 7, in resolve_version
    return solver.solve()
  File "/Users/someuser/.poetry/lib/poetry/mixology/version_solver.py", line 80, in solve
    next = self._choose_package_version()
  File "/Users/someuser/.poetry/lib/poetry/mixology/version_solver.py", line 381, in _choose_package_version
    for incompatibility in self._provider.incompatibilities_for(version):
  File "/Users/someuser/.poetry/lib/poetry/puzzle/provider.py", line 529, in incompatibilities_for
    for dep in dependencies
  File "/Users/someuser/.poetry/lib/poetry/puzzle/provider.py", line 529, in <listcomp>
    for dep in dependencies
  File "/Users/someuser/.poetry/lib/poetry/mixology/incompatibility.py", line 60, in __init__
    assert by_ref[ref] is not None

[MatheusR42]

@abn , I was using version 1.1.0, but I realized that the problem is that I created a new project with same name of the package. I did this 😅 :

$ poetry new networkx
Created package networkx in networkx
$ cd networkx/
$ poetry add networkx
Creating virtualenv networkx-ij1fzQR9-py3.8 in /home/matheusr42/.cache/pypoetry/virtualenvs
Using version ^2.5 for networkx

Updating dependencies
Resolving dependencies... (0.0s)

  AssertionError

  

  at ~/.poetry/lib/poetry/mixology/incompatibility.py:111 in __str__
      107│         )
      108│ 
      109│     def __str__(self):
      110│         if isinstance(self._cause, DependencyCause):
    → 111│             assert len(self._terms) == 2
      112│ 
      113│             depender = self._terms[0]
      114│             dependee = self._terms[1]
      115│             assert depender.is_positive()

I tried with another project name and it works, thanks! 😁 I think that it is not a big problem, but will be nice if there is a warn message.

[michaeljones]

I made the same mistake as @MatheusR42. I wanted to play around with py2app so I made a project callec py2app. I didn’t know that would break things. Certainly would appreciate a better message than the line 111 AssertionError. Love Poetry otherwise though 😃