Could not parse version constraint: <empty> #1782
Description
- 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 (
-vvvoption).
- OS version and name: macOS 10.15.2
- Poetry version: 1.0.0(master branch in fact)
- Link of a Gist with the contents of your pyproject.toml file:
Issue
The following lines:
poetry/poetry/puzzle/provider.py
Lines 676 to 680 in 06cdc77
When the package python constraint(e.g. We want flake8 for python >=3.6 only, it doesn't overlap with dep python constraint(e.g. configparser is only needed for python <3.2), it means configparser is not required at all and shouldn't be listed in the lock result. However, in this case poetry will throw a Could not parse version constraint: <empty> error because the intersection version is <empty>.
Error detail:
Traceback (most recent call last):
File "/Users/fming/.virtualenvs/poetry-ZHUPScpV-py3.7/lib/python3.7/site-packages/clikit/console_application.py", line 131, in run
status_code = command.handle(parsed_args, io)
File "/Users/fming/.virtualenvs/poetry-ZHUPScpV-py3.7/lib/python3.7/site-packages/clikit/api/command/command.py", line 120, in handle
status_code = self._do_handle(args, io)
File "/Users/fming/.virtualenvs/poetry-ZHUPScpV-py3.7/lib/python3.7/site-packages/clikit/api/command/command.py", line 171, in _do_handle
return getattr(handler, handler_method)(args, io, self)
File "/Users/fming/.virtualenvs/poetry-ZHUPScpV-py3.7/lib/python3.7/site-packages/cleo/commands/command.py", line 92, in wrap_handle
return self.handle()
File "/Users/fming/wkspace/github/poetry/poetry/console/commands/add.py", line 149, in handle
status = installer.run()
File "/Users/fming/wkspace/github/poetry/poetry/installation/installer.py", line 74, in run
self._do_install(local_repo)
File "/Users/fming/wkspace/github/poetry/poetry/installation/installer.py", line 161, in _do_install
ops = solver.solve(use_latest=self._whitelist)
File "/Users/fming/wkspace/github/poetry/poetry/puzzle/solver.py", line 36, in solve
packages, depths = self._solve(use_latest=use_latest)
File "/Users/fming/wkspace/github/poetry/poetry/puzzle/solver.py", line 181, in _solve
self._package, self._provider, locked=locked, use_latest=use_latest
File "/Users/fming/wkspace/github/poetry/poetry/mixology/__init__.py", line 7, in resolve_version
return solver.solve()
File "/Users/fming/wkspace/github/poetry/poetry/mixology/version_solver.py", line 80, in solve
next = self._choose_package_version()
File "/Users/fming/wkspace/github/poetry/poetry/mixology/version_solver.py", line 378, in _choose_package_version
version = self._provider.complete_package(version)
File "/Users/fming/wkspace/github/poetry/poetry/puzzle/provider.py", line 678, in complete_package
package.dependency.python_constraint
File "/Users/fming/wkspace/github/poetry/poetry/packages/dependency.py", line 118, in transitive_python_versions
self._transitive_python_constraint = parse_constraint(value)
File "/Users/fming/wkspace/github/poetry/poetry/semver/__init__.py", line 31, in parse_constraint
constraint_objects.append(parse_single_constraint(and_constraints[0]))
File "/Users/fming/wkspace/github/poetry/poetry/semver/__init__.py", line 164, in parse_single_constraint
raise ValueError('Could not parse version constraint: {}'.format(constraint))
Steps to replicate
$ poetry add -D -vvv --python ">=3.6" pytest