[1.2.0a2] Various issues while trying to develop a plugin

[mtkennerly]

• 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: Windows 10
• Poetry version: 1.2.0a2
• Python version: 3.7.0
• Link of a Gist with the contents of your pyproject.toml file: See below

Files

pyproject.toml:

[tool.poetry]
name = "simple-plugin"
version = "0.1.0"
description = ""
authors = []

[tool.poetry.dependencies]
python = "^3.6"
poetry = "^1.2.0a1"  # ^1.2

[tool.poetry.plugins."poetry.plugin"]
simple-plugin = 'simple_plugin.__init__:SimplePlugin'

[build-system]
requires = ["poetry-core"]
build-backend = "poetry.core.masonry.api"

simple_plugin/__init__.py:

from cleo.io.io import IO

from poetry.plugins.plugin import Plugin
from poetry.poetry import Poetry


class SimplePlugin(Plugin):
    def activate(self, poetry: Poetry, io: IO):
        version = "1.2.3"
        io.write_line(f"Setting package version to <b>{version}</b>")
        poetry.package.set_version(version)

Issue

Hi! I'm trying to update poetry-dynamic-versioning to use the new plugin system (ref: mtkennerly/poetry-dynamic-versioning#39), but I've encountered several issues, and I'm currently unable to proceed because of the last one. To narrow things down, I've reproduced them using a bare-minimum sample plugin. Let me know if you'd like separate reports for each problem, but I didn't want to clutter the issue list if they're ultimately related.

Poetry's cachecontrol dependency is too low

Poetry declares a dependency on:

cachecontrol = { version = "^0.12.4", extras = ["filecache"] }

However, using cachecontrol 0.12.5 produces this error on poetry plugin add -vvv .:

Loading configuration file C:\Users\mtken\AppData\Roaming\pypoetry\config.toml
Loading configuration file C:\Users\mtken\AppData\Roaming\pypoetry\auth.toml

  Stack trace:

  26  c:\python\3.7.0-32\lib\site-packages\cleo\application.py:330 in run
       328│
       329│             try:
     → 330│                 exit_code = self._run(io)
       331│             except Exception as e:
       332│                 if not self._catch_exceptions:

  25  c:\python\3.7.0-32\lib\site-packages\poetry\console\application.py:180 in _run
       178│         self._load_plugins(io)
       179│
     → 180│         return super()._run(io)
       181│
       182│     def _configure_io(self, io: IO) -> None:

  24  c:\python\3.7.0-32\lib\site-packages\cleo\application.py:425 in _run
       423│                 io.set_input(ArgvInput(argv))
       424│
     → 425│         exit_code = self._run_command(command, io)
       426│         self._running_command = None
       427│

  23  c:\python\3.7.0-32\lib\site-packages\cleo\application.py:467 in _run_command
       465│
       466│         if error is not None:
     → 467│             raise error
       468│
       469│         return event.exit_code

  22  c:\python\3.7.0-32\lib\site-packages\cleo\application.py:451 in _run_command
       449│
       450│             if event.command_should_run():
     → 451│                 exit_code = command.run(io)
       452│             else:
       453│                 exit_code = ConsoleCommandEvent.RETURN_CODE_DISABLED

  21  c:\python\3.7.0-32\lib\site-packages\cleo\commands\base_command.py:118 in run
       116│         io.input.validate()
       117│
     → 118│         status_code = self.execute(io)
       119│
       120│         if status_code is None:

  20  c:\python\3.7.0-32\lib\site-packages\cleo\commands\command.py:85 in execute
        83│
        84│         try:
     →  85│             return self.handle()
        86│         except KeyboardInterrupt:
        87│             return 1

  19  c:\python\3.7.0-32\lib\site-packages\poetry\console\commands\plugin\add.py:99 in handle
        97│             return 0
        98│
     →  99│         plugins = self._determine_requirements(plugins)
       100│
       101│         # We retrieve the packages installed in the system environment.

  18  c:\python\3.7.0-32\lib\site-packages\poetry\console\commands\init.py:341 in _determine_requirements
       339│                     requirement["name"],
       340│                     allow_prereleases=allow_prereleases,
     → 341│                     source=source,
       342│                 )
       343│                 requirement["version"] = version

  17  c:\python\3.7.0-32\lib\site-packages\poetry\console\commands\init.py:376 in _find_best_version_for_package
       374│         selector = VersionSelector(self._get_pool())
       375│         package = selector.find_best_candidate(
     → 376│             name, required_version, allow_prereleases=allow_prereleases, source=source
       377│         )
       378│

  16  c:\python\3.7.0-32\lib\site-packages\poetry\version\version_selector.py:38 in find_best_candidate
        36│             },
        37│         )
     →  38│         candidates = self._pool.find_packages(dependency)
        39│         only_prereleases = all([c.version.is_unstable() for c in candidates])
        40│

  15  c:\python\3.7.0-32\lib\site-packages\poetry\repositories\pool.py:171 in find_packages
       169│         packages = []
       170│         for repo in self._repositories:
     → 171│             packages += repo.find_packages(dependency)
       172│
       173│         return packages

  14  c:\python\3.7.0-32\lib\site-packages\poetry\repositories\pypi_repository.py:108 in find_packages
       106│
       107│         try:
     → 108│             info = self.get_package_info(dependency.name)
       109│         except PackageNotFound:
       110│             self._log(

  13  c:\python\3.7.0-32\lib\site-packages\poetry\repositories\pypi_repository.py:210 in get_package_info
       208│
       209│         return self._cache.store("packages").remember_forever(
     → 210│             name, lambda: self._get_package_info(name)
       211│         )
       212│

  12  ~\AppData\Roaming\Python\Python37\site-packages\cachy\repository.py:174 in remember_forever
       172│             return val
       173│
     → 174│         val = value(callback)
       175│
       176│         self.forever(key, val)

  11  ~\AppData\Roaming\Python\Python37\site-packages\cachy\helpers.py:6 in value
         4│ def value(val):
         5│     if callable(val):
     →   6│         return val()
         7│
         8│     return val

  10  c:\python\3.7.0-32\lib\site-packages\poetry\repositories\pypi_repository.py:210 in <lambda>
       208│
       209│         return self._cache.store("packages").remember_forever(
     → 210│             name, lambda: self._get_package_info(name)
       211│         )
       212│

   9  c:\python\3.7.0-32\lib\site-packages\poetry\repositories\pypi_repository.py:214 in _get_package_info
       212│
       213│     def _get_package_info(self, name: str) -> dict:
     → 214│         data = self._get(f"pypi/{name}/json")
       215│         if data is None:
       216│             raise PackageNotFound(f"Package [{name}] not found.")

   8  c:\python\3.7.0-32\lib\site-packages\poetry\repositories\pypi_repository.py:326 in _get
       324│     def _get(self, endpoint: str) -> Union[dict, None]:
       325│         try:
     → 326│             json_response = self.session.get(self._base_url + endpoint)
       327│         except requests.exceptions.TooManyRedirects:
       328│             # Cache control redirect loop.

   7  c:\python\3.7.0-32\lib\site-packages\requests\sessions.py:555 in get
       553│
       554│         kwargs.setdefault('allow_redirects', True)
     → 555│         return self.request('GET', url, **kwargs)
       556│
       557│     def options(self, url, **kwargs):

   6  c:\python\3.7.0-32\lib\site-packages\requests\sessions.py:542 in request
       540│         }
       541│         send_kwargs.update(settings)
     → 542│         resp = self.send(prep, **send_kwargs)
       543│
       544│         return resp

   5  c:\python\3.7.0-32\lib\site-packages\requests\sessions.py:655 in send
       653│
       654│         # Send the request
     → 655│         r = adapter.send(request, **kwargs)
       656│
       657│         # Total elapsed time of the request (approximately)

   4  c:\python\3.7.0-32\lib\site-packages\cachecontrol\adapter.py:44 in send
        42│         if request.method in cacheable:
        43│             try:
     →  44│                 cached_response = self.controller.cached_request(request)
        45│             except zlib.error:
        46│                 cached_response = None

   3  c:\python\3.7.0-32\lib\site-packages\cachecontrol\controller.py:145 in cached_request
       143│
       144│         # Check whether it can be deserialized
     → 145│         resp = self.serializer.loads(request, cache_data)
       146│         if not resp:
       147│             logger.warning("Cache entry deserialization failed, entry ignored")

   2  c:\python\3.7.0-32\lib\site-packages\cachecontrol\serialize.py:97 in loads
        95│         # Dispatch to the actual load method for the given version
        96│         try:
     →  97│             return getattr(self, "_loads_v{}".format(ver))(request, data)
        98│
        99│         except AttributeError:

   1  c:\python\3.7.0-32\lib\site-packages\cachecontrol\serialize.py:182 in _loads_v4
       180│     def _loads_v4(self, request, data):
       181│         try:
     → 182│             cached = msgpack.loads(data, encoding="utf-8")
       183│         except ValueError:
       184│             return

  TypeError

  unpackb() got an unexpected keyword argument 'encoding'

  at msgpack\_unpacker.pyx:144 in msgpack._cmsgpack.unpackb

This can be fixed by upgrading to cachecontrol 0.12.6.

Can't refer to current project with . when adding plugin

poetry plugin add -vvv . yields this error:

Loading configuration file C:\Users\mtken\AppData\Roaming\pypoetry\config.toml
Loading configuration file C:\Users\mtken\AppData\Roaming\pypoetry\auth.toml

  Stack trace:

  9  c:\python\3.7.0-32\lib\site-packages\cleo\application.py:330 in run
      328│
      329│             try:
    → 330│                 exit_code = self._run(io)
      331│             except Exception as e:
      332│                 if not self._catch_exceptions:

  8  c:\python\3.7.0-32\lib\site-packages\poetry\console\application.py:180 in _run
      178│         self._load_plugins(io)
      179│
    → 180│         return super()._run(io)
      181│
      182│     def _configure_io(self, io: IO) -> None:

  7  c:\python\3.7.0-32\lib\site-packages\cleo\application.py:425 in _run
      423│                 io.set_input(ArgvInput(argv))
      424│
    → 425│         exit_code = self._run_command(command, io)
      426│         self._running_command = None
      427│

  6  c:\python\3.7.0-32\lib\site-packages\cleo\application.py:467 in _run_command
      465│
      466│         if error is not None:
    → 467│             raise error
      468│
      469│         return event.exit_code

  5  c:\python\3.7.0-32\lib\site-packages\cleo\application.py:451 in _run_command
      449│
      450│             if event.command_should_run():
    → 451│                 exit_code = command.run(io)
      452│             else:
      453│                 exit_code = ConsoleCommandEvent.RETURN_CODE_DISABLED

  4  c:\python\3.7.0-32\lib\site-packages\cleo\commands\base_command.py:118 in run
      116│         io.input.validate()
      117│
    → 118│         status_code = self.execute(io)
      119│
      120│         if status_code is None:

  3  c:\python\3.7.0-32\lib\site-packages\cleo\commands\command.py:85 in execute
       83│
       84│         try:
    →  85│             return self.handle()
       86│         except KeyboardInterrupt:
       87│             return 1

  2  c:\python\3.7.0-32\lib\site-packages\poetry\console\commands\plugin\add.py:99 in handle
       97│             return 0
       98│
    →  99│         plugins = self._determine_requirements(plugins)
      100│
      101│         # We retrieve the packages installed in the system environment.

  1  c:\python\3.7.0-32\lib\site-packages\poetry\console\commands\init.py:341 in _determine_requirements
      339│                     requirement["name"],
      340│                     allow_prereleases=allow_prereleases,
    → 341│                     source=source,
      342│                 )
      343│                 requirement["version"] = version

  ValueError

  Could not find a matching version of package .

  at c:\python\3.7.0-32\lib\site-packages\poetry\console\commands\init.py:382 in _find_best_version_for_package
      378│
      379│         if not package:
      380│             # TODO: find similar
      381│             raise ValueError(
    → 382│                 "Could not find a matching version of package {}".format(name)
      383│             )
      384│
      385│         return package.pretty_name, selector.find_recommended_require_version(package)
      386│

I can work around this by building a wheel and adding that instead.

Can't use relative path to wheel when adding plugin

poetry build followed by poetry plugin add -vvv dist\simple_plugin-0.1.0-py3-none-any.whl yields this error:

Loading configuration file C:\Users\mtken\AppData\Roaming\pypoetry\config.toml
Loading configuration file C:\Users\mtken\AppData\Roaming\pypoetry\auth.toml

  Stack trace:

  12  c:\python\3.7.0-32\lib\site-packages\cleo\application.py:330 in run
       328│
       329│             try:
     → 330│                 exit_code = self._run(io)
       331│             except Exception as e:
       332│                 if not self._catch_exceptions:

  11  c:\python\3.7.0-32\lib\site-packages\poetry\console\application.py:180 in _run
       178│         self._load_plugins(io)
       179│
     → 180│         return super()._run(io)
       181│
       182│     def _configure_io(self, io: IO) -> None:

  10  c:\python\3.7.0-32\lib\site-packages\cleo\application.py:425 in _run
       423│                 io.set_input(ArgvInput(argv))
       424│
     → 425│         exit_code = self._run_command(command, io)
       426│         self._running_command = None
       427│

   9  c:\python\3.7.0-32\lib\site-packages\cleo\application.py:467 in _run_command
       465│
       466│         if error is not None:
     → 467│             raise error
       468│
       469│         return event.exit_code

   8  c:\python\3.7.0-32\lib\site-packages\cleo\application.py:451 in _run_command
       449│
       450│             if event.command_should_run():
     → 451│                 exit_code = command.run(io)
       452│             else:
       453│                 exit_code = ConsoleCommandEvent.RETURN_CODE_DISABLED

   7  c:\python\3.7.0-32\lib\site-packages\cleo\commands\base_command.py:118 in run
       116│         io.input.validate()
       117│
     → 118│         status_code = self.execute(io)
       119│
       120│         if status_code is None:

   6  c:\python\3.7.0-32\lib\site-packages\cleo\commands\command.py:85 in execute
        83│
        84│         try:
     →  85│             return self.handle()
        86│         except KeyboardInterrupt:
        87│             return 1

   5  c:\python\3.7.0-32\lib\site-packages\poetry\console\commands\plugin\add.py:162 in handle
       160│         # We won't go through the event dispatching done by the application
       161│         # so we need to configure the command manually
     → 162│         update_command.set_poetry(Factory().create_poetry(env_dir))
       163│         update_command.set_env(system_env)
       164│         application._configure_installer(update_command, self._io)

   4  c:\python\3.7.0-32\lib\site-packages\poetry\factory.py:44 in create_poetry
        42│             io = NullIO()
        43│
     →  44│         base_poetry = super(Factory, self).create_poetry(cwd)
        45│
        46│         locker = Locker(

   3  c:\python\3.7.0-32\lib\site-packages\poetry\core\factory.py:52 in create_poetry
        50│         package = self.get_package(name, version)
        51│         package = self.configure_package(
     →  52│             package, local_config, poetry_file.parent, with_groups=with_groups
        53│         )
        54│

   2  c:\python\3.7.0-32\lib\site-packages\poetry\core\factory.py:120 in configure_package
       118│
       119│                 group.add_dependency(
     → 120│                     cls.create_dependency(name, constraint, root_dir=package.root_dir)
       121│                 )
       122│

   1  c:\python\3.7.0-32\lib\site-packages\poetry\core\factory.py:317 in create_dependency
       315│                         base=root_dir,
       316│                         develop=constraint.get("develop", False),
     → 317│                         extras=constraint.get("extras", []),
       318│                     )
       319│             elif "url" in constraint:

  ValueError

  Directory dist\simple_plugin-0.1.0-py3-none-any.whl does not exist

  at c:\python\3.7.0-32\lib\site-packages\poetry\core\packages\directory_dependency.py:43 in __init__
       39│         self._develop = develop
       40│         self._supports_poetry = False
       41│
       42│         if not self._full_path.exists():
    →  43│             raise ValueError("Directory {} does not exist".format(self._path))
       44│
       45│         if self._full_path.is_file():
       46│             raise ValueError("{} is a file, expected a directory".format(self._path))
       47│

I can work around this by using an absolute path.

Poetry's dataclasses dependency blocks Python 3.7 when adding plugin

Poetry declares a dependency on:

dataclasses = {version = "^0.8", python = "~3.6"}

poetry plugin add -vvv C:\tmp\simple-plugin\dist\simple_plugin-0.1.0-py3-none-any.whl yields this error:

Loading configuration file C:\Users\mtken\AppData\Roaming\pypoetry\config.toml
Loading configuration file C:\Users\mtken\AppData\Roaming\pypoetry\auth.toml
Updating dependencies
Resolving dependencies...
   1: fact: poetry is 1.2.0a2
   1: derived: poetry
   1: fact: poetry depends on cachecontrol (>=0.12.4,<0.13.0)
   1: fact: poetry depends on cachy (>=0.3.0,<0.4.0)
   1: fact: poetry depends on cleo (>=1.0.0a4,<2.0.0)
   1: fact: poetry depends on crashtest (>=0.3.0,<0.4.0)
   1: fact: poetry depends on dataclasses (>=0.8,<0.9)
   1: fact: poetry depends on entrypoints (>=0.3,<0.4)
   1: fact: poetry depends on html5lib (>=1.0,<2.0)
   1: fact: poetry depends on importlib-metadata (>=1.6.0,<2.0.0)
   1: fact: poetry depends on keyring (>=21.2.0)
   1: fact: poetry depends on packaging (>=20.4,<21.0)
   1: fact: poetry depends on pexpect (>=4.7.0,<5.0.0)
   1: fact: poetry depends on pkginfo (>=1.5,<2.0)
   1: fact: poetry depends on poetry-core (>=1.1.0a6,<2.0.0)
   1: fact: poetry depends on requests (>=2.18,<3.0)
   1: fact: poetry depends on requests-toolbelt (>=0.9.1,<0.10.0)
   1: fact: poetry depends on shellingham (>=1.1,<2.0)
   1: fact: poetry depends on tomlkit (>=0.7.0,<1.0.0)
   1: fact: poetry depends on virtualenv (>=20.4.3,<20.4.5)
   1: fact: poetry depends on poetry-version-plugin (^0.1.3)
   1: fact: poetry depends on poetry-dynamic-versioning (0.14.0a1)
   1: fact: poetry depends on simple-plugin (0.1.0)
   1: selecting poetry (1.2.0a2)
   1: derived: simple-plugin (0.1.0 C:\tmp\simple-plugin\dist\simple_plugin-0.1.0-py3-none-any.whl)
   1: derived: poetry-dynamic-versioning (0.14.0a1 D:\GitHub\mtkennerly\poetry-dynamic-versioning\dist\poetry_dynamic_versioning-0.14.0a1-py3-none-any.whl)
   1: derived: poetry-version-plugin (>=0.1.3,<0.2.0)
   1: derived: virtualenv (>=20.4.3,<20.4.5)
   1: derived: tomlkit (>=0.7.0,<1.0.0)
   1: derived: shellingham (>=1.1,<2.0)
   1: derived: requests-toolbelt (>=0.9.1,<0.10.0)
   1: derived: requests (>=2.18,<3.0)
   1: derived: poetry-core (>=1.1.0a6,<2.0.0)
   1: derived: pkginfo (>=1.5,<2.0)
   1: derived: pexpect (>=4.7.0,<5.0.0)
   1: derived: packaging (>=20.4,<21.0)
   1: derived: keyring (>=21.2.0)
   1: derived: importlib-metadata (>=1.6.0,<2.0.0)
   1: derived: html5lib (>=1.0,<2.0)
   1: derived: entrypoints (>=0.3,<0.4)
   1: derived: dataclasses (>=0.8,<0.9)
   1: derived: crashtest (>=0.3.0,<0.4.0)
   1: derived: cleo (>=1.0.0a4,<2.0.0)
   1: derived: cachy (>=0.3.0,<0.4.0)
   1: derived: cachecontrol[filecache] (>=0.12.4,<0.13.0)
   1: fact: simple-plugin (0.1.0) depends on poetry (>=1.2.0a1,<2.0.0)
   1: selecting simple-plugin (0.1.0 C:/tmp/simple-plugin/dist/simple_plugin-0.1.0-py3-none-any.whl)
   1: fact: poetry-dynamic-versioning (0.14.0a1) depends on dunamai (>=1.5,<2.0)
   1: fact: poetry-dynamic-versioning (0.14.0a1) depends on jinja2 (>=2.11.1,<4)
   1: fact: poetry-dynamic-versioning (0.14.0a1) depends on poetry (>=1.2.0a1,<2.0.0)
   1: selecting poetry-dynamic-versioning (0.14.0a1 D:/GitHub/mtkennerly/poetry-dynamic-versioning/dist/poetry_dynamic_versioning-0.14.0a1-py3-none-any.whl)
   1: derived: jinja2 (>=2.11.1,<4)
   1: derived: dunamai (>=1.5,<2.0)
   1: fact: poetry-version-plugin (0.1.3) depends on poetry (>=1.2.0a1,<2.0.0)
   1: selecting poetry-version-plugin (0.1.3)
   1: fact: virtualenv (20.4.4) depends on appdirs (>=1.4.3,<2)
   1: fact: virtualenv (20.4.4) depends on distlib (>=0.3.1,<1)
   1: fact: virtualenv (20.4.4) depends on filelock (>=3.0.0,<4)
   1: fact: virtualenv (20.4.4) depends on six (>=1.9.0,<2)
   1: fact: virtualenv (20.4.4) depends on importlib-metadata (>=0.12)
   1: selecting virtualenv (20.4.4)
   1: derived: six (>=1.9.0,<2)
   1: derived: filelock (>=3.0.0,<4)
   1: derived: distlib (>=0.3.1,<1)
   1: derived: appdirs (>=1.4.3,<2)
   1: selecting tomlkit (0.7.2)
   1: selecting shellingham (1.4.0)
   1: fact: requests-toolbelt (0.9.1) depends on requests (>=2.0.1,<3.0.0)
   1: selecting requests-toolbelt (0.9.1)
   1: fact: requests (2.26.0) depends on urllib3 (>=1.21.1,<1.27)
   1: fact: requests (2.26.0) depends on certifi (>=2017.4.17)
   1: fact: requests (2.26.0) depends on charset-normalizer (>=2.0.0,<2.1.0)
   1: fact: requests (2.26.0) depends on idna (>=2.5,<4)
   1: selecting requests (2.26.0)
   1: derived: idna (>=2.5,<4)
   1: derived: charset-normalizer (>=2.0.0,<2.1.0)
   1: derived: certifi (>=2017.4.17)
   1: derived: urllib3 (>=1.21.1,<1.27)
   1: fact: poetry-core (1.1.0a6) depends on importlib-metadata (>=1.7.0)
   1: selecting poetry-core (1.1.0a6)
   1: derived: importlib-metadata (>=1.7.0)
   1: selecting pkginfo (1.7.1)
   1: fact: pexpect (4.8.0) depends on ptyprocess (>=0.5)
   1: selecting pexpect (4.8.0)
   1: derived: ptyprocess (>=0.5)
   1: fact: packaging (20.9) depends on pyparsing (>=2.0.2)
   1: selecting packaging (20.9)
   1: derived: pyparsing (>=2.0.2)
   1: fact: keyring (22.3.0) depends on importlib-metadata (>=1)
   1: fact: keyring (22.3.0) depends on SecretStorage (>=3.2)
   1: fact: keyring (22.3.0) depends on jeepney (>=0.4.2)
   1: fact: keyring (22.3.0) depends on pywin32-ctypes (<0.1.0 || >0.1.0,<0.1.1 || >0.1.1)
   1: selecting keyring (22.3.0)
   1: derived: pywin32-ctypes (!=0.1.0,!=0.1.1)
   1: derived: jeepney (>=0.4.2)
   1: derived: SecretStorage (>=3.2)
   1: fact: html5lib (1.1) depends on six (>=1.9)
   1: fact: html5lib (1.1) depends on webencodings (*)
   1: selecting html5lib (1.1)
   1: derived: webencodings
   1: selecting entrypoints (0.3)
   1: selecting crashtest (0.3.1)
   1: fact: cleo (1.0.0a4) depends on pylev (>=1.3.0,<2.0.0)
   1: fact: cleo (1.0.0a4) depends on crashtest (>=0.3.1,<0.4.0)
   1: selecting cleo (1.0.0a4)
   1: derived: pylev (>=1.3.0,<2.0.0)
   1: selecting cachy (0.3.0)
   1: selecting six (1.16.0)
   1: selecting filelock (3.0.12)
   1: selecting distlib (0.3.2)
   1: selecting appdirs (1.4.4)
   1: selecting certifi (2021.5.30)
   1: selecting urllib3 (1.26.6)
   1: selecting ptyprocess (0.7.0)
   1: selecting pyparsing (2.4.7)
   1: selecting webencodings (0.5.1)
   1: selecting pylev (1.4.0)
   1: fact: cachecontrol (0.12.6) depends on cachecontrol (0.12.6)
   1: fact: cachecontrol (0.12.6) depends on requests (*)
   1: fact: cachecontrol (0.12.6) depends on msgpack (>=0.5.2)
   1: fact: cachecontrol (0.12.6) depends on lockfile (>=0.9)
   1: selecting cachecontrol[filecache] (0.12.6)
   1: derived: lockfile (>=0.9)
   1: derived: msgpack (>=0.5.2)
   1: derived: cachecontrol (==0.12.6)
   1: selecting msgpack (1.0.2)
   1: fact: jinja2 (3.0.1) depends on MarkupSafe (>=2.0)
   1: selecting jinja2 (3.0.1)
   1: derived: MarkupSafe (>=2.0)
   1: selecting markupsafe (2.0.1)
   1: fact: dunamai (1.6.0) depends on setuptools (>=8.0)
   1: selecting dunamai (1.6.0)
   1: derived: setuptools (>=8.0)
   1: selecting setuptools (57.4.0)
   1: fact: importlib-metadata (1.7.0) depends on zipp (>=0.5)
   1: selecting importlib-metadata (1.7.0)
   1: derived: zipp (>=0.5)
   1: selecting zipp (3.5.0)
   1: fact: dataclasses (0.8) requires Python >=3.6, <3.7
   1: derived: not dataclasses (==0.8)
   1: fact: no versions of dataclasses match >0.8,<0.9
   1: conflict: no versions of dataclasses match >0.8,<0.9
   1: derived: not dataclasses (>0.8,<0.9)
   1: conflict: dataclasses (0.8) requires Python >=3.6, <3.7
   1: ! dataclasses (==0.8) is partially satisfied by not dataclasses (>0.8,<0.9)
   1: ! which is caused by "no versions of dataclasses match >0.8,<0.9"
   1: ! thus: dataclasses is forbidden
   1: ! dataclasses (>=0.8,<0.9) is satisfied by dataclasses (>=0.8,<0.9)
   1: ! which is caused by "poetry depends on dataclasses (>=0.8,<0.9)"
   1: ! thus: version solving failed
   1: Version solving took 0.593 seconds.
   1: Tried 1 solutions.

  Stack trace:

  4  c:\python\3.7.0-32\lib\site-packages\poetry\puzzle\solver.py:139 in _solve
      137│         try:
      138│             result = resolve_version(
    → 139│                 self._package, self._provider, locked=locked, use_latest=use_latest
      140│             )
      141│

  3  c:\python\3.7.0-32\lib\site-packages\poetry\mixology\__init__.py:24 in resolve_version
       22│     solver = VersionSolver(root, provider, locked=locked, use_latest=use_latest)
       23│
    →  24│     return solver.solve()
       25│

  2  c:\python\3.7.0-32\lib\site-packages\poetry\mixology\version_solver.py:81 in solve
       79│             next = self._root.name
       80│             while next is not None:
    →  81│                 self._propagate(next)
       82│                 next = self._choose_package_version()
       83│

  1  c:\python\3.7.0-32\lib\site-packages\poetry\mixology\version_solver.py:121 in _propagate
      119│                     # where that incompatibility will allow us to derive new assignments
      120│                     # that avoid the conflict.
    → 121│                     root_cause = self._resolve_conflict(incompatibility)
      122│
      123│                     # Back jumping erases all the assignments we did at the previous

  SolveFailure

  The current project's Python requirement (3.7.0) is not compatible with some of the required packages Python requirement:
    - dataclasses requires Python >=3.6, <3.7, so it will not be satisfied for Python 3.7.0

  Because dataclasses (0.8) requires Python >=3.6, <3.7
   and no versions of dataclasses match >0.8,<0.9, dataclasses is forbidden.
  So, because poetry depends on dataclasses (>=0.8,<0.9), version solving failed.

  at c:\python\3.7.0-32\lib\site-packages\poetry\mixology\version_solver.py:315 in _resolve_conflict
      311│             )
      312│             self._log(f'{bang} which is caused by "{most_recent_satisfier.cause}"')
      313│             self._log(f"{bang} thus: {incompatibility}")
      314│
    → 315│         raise SolveFailure(incompatibility)
      316│
      317│     def _choose_package_version(self) -> Optional[str]:
      318│         """
      319│         Tries to select a version of a required package.

The following error occurred when trying to handle this error:


  Stack trace:

  14  c:\python\3.7.0-32\lib\site-packages\cleo\application.py:330 in run
       328│
       329│             try:
     → 330│                 exit_code = self._run(io)
       331│             except Exception as e:
       332│                 if not self._catch_exceptions:

  13  c:\python\3.7.0-32\lib\site-packages\poetry\console\application.py:180 in _run
       178│         self._load_plugins(io)
       179│
     → 180│         return super()._run(io)
       181│
       182│     def _configure_io(self, io: IO) -> None:

  12  c:\python\3.7.0-32\lib\site-packages\cleo\application.py:425 in _run
       423│                 io.set_input(ArgvInput(argv))
       424│
     → 425│         exit_code = self._run_command(command, io)
       426│         self._running_command = None
       427│

  11  c:\python\3.7.0-32\lib\site-packages\cleo\application.py:467 in _run_command
       465│
       466│         if error is not None:
     → 467│             raise error
       468│
       469│         return event.exit_code

  10  c:\python\3.7.0-32\lib\site-packages\cleo\application.py:451 in _run_command
       449│
       450│             if event.command_should_run():
     → 451│                 exit_code = command.run(io)
       452│             else:
       453│                 exit_code = ConsoleCommandEvent.RETURN_CODE_DISABLED

   9  c:\python\3.7.0-32\lib\site-packages\cleo\commands\base_command.py:118 in run
       116│         io.input.validate()
       117│
     → 118│         status_code = self.execute(io)
       119│
       120│         if status_code is None:

   8  c:\python\3.7.0-32\lib\site-packages\cleo\commands\command.py:85 in execute
        83│
        84│         try:
     →  85│             return self.handle()
        86│         except KeyboardInterrupt:
        87│             return 1

   7  c:\python\3.7.0-32\lib\site-packages\poetry\console\commands\plugin\add.py:174 in handle
       172│                 StringInput(" ".join(argv)),
       173│                 self._io.output,
     → 174│                 self._io.error_output,
       175│             )
       176│         )

   6  c:\python\3.7.0-32\lib\site-packages\cleo\commands\base_command.py:118 in run
       116│         io.input.validate()
       117│
     → 118│         status_code = self.execute(io)
       119│
       120│         if status_code is None:

   5  c:\python\3.7.0-32\lib\site-packages\cleo\commands\command.py:85 in execute
        83│
        84│         try:
     →  85│             return self.handle()
        86│         except KeyboardInterrupt:
        87│             return 1

   4  c:\python\3.7.0-32\lib\site-packages\poetry\console\commands\update.py:49 in handle
        47│         self._installer.update(True)
        48│
     →  49│         return self._installer.run()
        50│

   3  c:\python\3.7.0-32\lib\site-packages\poetry\installation\installer.py:114 in run
       112│         local_repo = Repository()
       113│
     → 114│         return self._do_install(local_repo)
       115│
       116│     def dry_run(self, dry_run: bool = True) -> "Installer":

   2  c:\python\3.7.0-32\lib\site-packages\poetry\installation\installer.py:251 in _do_install
       249│             )
       250│
     → 251│             ops = solver.solve(use_latest=self._whitelist).calculate_operations()
       252│         else:
       253│             self._io.write_line("Installing dependencies from lock file")

   1  c:\python\3.7.0-32\lib\site-packages\poetry\puzzle\solver.py:77 in solve
        75│         with self._provider.progress():
        76│             start = time.time()
     →  77│             packages, depths = self._solve(use_latest=use_latest)
        78│             end = time.time()
        79│

  SolverProblemError

  The current project's Python requirement (3.7.0) is not compatible with some of the required packages Python requirement:
    - dataclasses requires Python >=3.6, <3.7, so it will not be satisfied for Python 3.7.0

  Because dataclasses (0.8) requires Python >=3.6, <3.7
   and no versions of dataclasses match >0.8,<0.9, dataclasses is forbidden.
  So, because poetry depends on dataclasses (>=0.8,<0.9), version solving failed.

  at c:\python\3.7.0-32\lib\site-packages\poetry\puzzle\solver.py:146 in _solve
      142│             packages = result.packages
      143│         except OverrideNeeded as e:
      144│             return self.solve_in_compatibility_mode(e.overrides, use_latest=use_latest)
      145│         except SolveFailure as e:
    → 146│             raise SolverProblemError(e)
      147│
      148│         # NOTE passing explicit empty array for seen to reset between invocations during update + install cycle
      149│         results = dict(
      150│             depth_first_search(

  • Check your dependencies Python requirement: The Python requirement can be specified via the `python` or `markers` properties

    For dataclasses, a possible solution would be to set the `python` property to "<empty>"

    https://python-poetry.org/docs/dependency-specification/#python-restricted-dependencies,
    https://python-poetry.org/docs/dependency-specification/#using-environment-markers

I'm not sure how to resolve or work around this one, so it's currently a blocker for me.

[noahp]

I just tested this myself (BTW, thank you for the Dunamai and poetry-dynamic-versioning , very helpful packages!), and it seemed to work only after I created a fresh virtualenv:

# copy the example simple-plugin pyproject.toml and __init__.py file into the cwd
.
├── pyproject.toml
└── simple_plugin
    └── __init__.py
# make sure we're outside all our virtualenvs etc. I used a pipx installed version of poetry 1.1.10 to start with
$ poetry shell
$ pip install poetry==1.2.0a2  # installing to the poetry virtualenv
$ exit
$ poetry shell  # go back in to the virtualenv
$ which poetry
/home/noah/.cache/pypoetry/virtualenvs/simple-plugin-SCbmyHCo-py3.9/bin/poetry
$ poetry build && poetry plugin add -vvv $PWD/dist/simple_plugin-0.1.0-py3-none-any.whl
$ poetry plugin show

  • simple-plugin (0.1.0)
      1 plugin

      Dependencies
        - poetry (>=1.2.0a1,<2.0.0)

It did NOT work when updating existing poetry to 1.2.0.a2 (same errors as you had). I was using python 3.9.5.

[mtkennerly]

Thanks! I just tried again, and I'm able to make progress now.

[github-actions]

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