Bug on poetry install `ValueError: invalid literal for int() with base 10: ''`

Description

Similar to https://github.com/python-poetry/poetry/issues/6861, but clearing the cache in our case did not work

Upon poetry install, poetry fails its install because of a parsing error. It only happens for one of our crew mate, not for all of us.

Here is an excerpt of the error (the full error stack is available below)

at ~/Library/Application Support/pypoetry/venv/lib/python3.14/site-packages/poetry/utils/env/base_env.py:453 in _run
      452│         except CalledProcessError as e:
    → 453│             raise EnvCommandError(e)
      454│ 

Cannot install asgiref.


  Stack trace:

  ...

  CalledProcessError

  Command '['/Users/mouhamadougaye/Documents/Abu-Dhabi-Customs/backend/.venv/bin/python', '-I', '-W', 'ignore', '-c', '\nimport importlib.util\nimport json\nimport sys\n\nfrom pathlib import Path\n\nspec = importlib.util.spec_from_file_location(\n    "packaging", Path(r"/Users/mouhamadougaye/Library/Application Support/pypoetry/venv/lib/python3.14/site-packages/packaging/__init__.py")\n)\npackaging = importlib.util.module_from_spec(spec)\nsys.modules[spec.name] = packaging\n\nspec = importlib.util.spec_from_file_location(\n    "packaging.tags", Path(r"/Users/mouhamadougaye/Library/Application Support/pypoetry/venv/lib/python3.14/site-packages/packaging/tags.py")\n)\npackaging_tags = importlib.util.module_from_spec(spec)\nspec.loader.exec_module(packaging_tags)\n\nprint(json.dumps(list(packaging_tags.platform_tags())))\n']' returned non-zero exit status 1.

  at /Library/Frameworks/Python.framework/Versions/3.14/lib/python3.14/subprocess.py:578 in run
       577│         if check and retcode:
    →  578│             raise CalledProcessError(retcode, process.args,
       579│                                      output=stdout, stderr=stderr)

The following error occurred when trying to handle this error:


  Stack trace:

 ...

   1  ~/Library/Application Support/pypoetry/venv/lib/python3.14/site-packages/poetry/utils/env/virtual_env.py:119 in _run
       118│         kwargs["env"] = self.get_temp_environ(environ=kwargs.get("env"))
     → 119│         return super()._run(cmd, **kwargs)
       120│ 

  EnvCommandError

  Command ['/Users/mouhamadougaye/Documents/Abu-Dhabi-Customs/backend/.venv/bin/python', '-I', '-W', 'ignore', '-c', '\nimport importlib.util\nimport json\nimport sys\n\nfrom pathlib import Path\n\nspec = importlib.util.spec_from_file_location(\n    "packaging", Path(r"/Users/mouhamadougaye/Library/Application Support/pypoetry/venv/lib/python3.14/site-packages/packaging/__init__.py")\n)\npackaging = importlib.util.module_from_spec(spec)\nsys.modules[spec.name] = packaging\n\nspec = importlib.util.spec_from_file_location(\n    "packaging.tags", Path(r"/Users/mouhamadougaye/Library/Application Support/pypoetry/venv/lib/python3.14/site-packages/packaging/tags.py")\n)\npackaging_tags = importlib.util.module_from_spec(spec)\nspec.loader.exec_module(packaging_tags)\n\nprint(json.dumps(list(packaging_tags.platform_tags())))\n'] errored with the following return code 1
  
  Error output:
  Traceback (most recent call last):
    File "<string>", line 20, in <module>
      print(json.dumps(list(packaging_tags.platform_tags())))
                       ~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/Users/mouhamadougaye/Library/Application Support/pypoetry/venv/lib/python3.14/site-packages/packaging/tags.py", line 604, in mac_platforms
      version = cast("AppleVersion", tuple(map(int, version_str.split(".")[:2])))
                                     ~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  ValueError: invalid literal for int() with base 10: ''

Workarounds

no workarounds

Poetry Installation Method

pipx

Operating System

MacOS 10.15.1

Poetry Version

2.4.1

Poetry Configuration

cache-dir = "/Users/mouhamadougaye/Library/Caches/pypoetry"
data-dir = "/Users/mouhamadougaye/Library/Application Support/pypoetry"
installer.max-workers = null
installer.no-binary = null
installer.only-binary = null
installer.parallel = true
installer.re-resolve = false
keyring.enabled = true
python.installation-dir = "{data-dir}/python"  # /Users/mouhamadougaye/Library/Application Support/pypoetry/python
requests.max-retries = 0
solver.lazy-wheel = true
solver.min-release-age = 0
solver.min-release-age-exclude = null
solver.min-release-age-exclude-source = null
system-git-client = false
virtualenvs.create = true
virtualenvs.in-project = null
virtualenvs.options.always-copy = false
virtualenvs.options.no-pip = false
virtualenvs.options.system-site-packages = false
virtualenvs.path = "{cache-dir}/virtualenvs"  # /Users/mouhamadougaye/Library/Caches/pypoetry/virtualenvs
virtualenvs.prompt = "{project_name}-py{python_version}"
virtualenvs.use-poetry-python = false

Python Sysconfig

Paste the output of 'python -m sysconfig', over this line.

Example pyproject.toml

it is not a reproducable error, even with the same pyproject file. But for the sake of issue completion, here it is:


[build-system]
requires = ["setuptools>=68", "wheel"]
build-backend = "setuptools.build_meta"

[project]
name = "abu-dhabi-customs-backend"
version = "0.1.0"
description = "Backend API for Abu Dhabi Customs Management System"
requires-python = "~=3.14.0"
dependencies = [
  "fastapi==0.136.0",
  "python-multipart",
  "aiohttp",
  "uvicorn[standard]==0.48.0",
  "pydantic==2.13.0",
  "pydantic-settings==2.13.0",
  "sqlalchemy[asyncio]==2.0.50",
  "greenlet",
  "aioodbc",
  "azure-search-documents>=12.0.0",
  "azure-storage-blob>=12.0.0",
  "azure-keyvault-secrets>=4.8.0",
  "azure-identity>=1.17.0",
  "azure-cognitiveservices-speech>=1.50.0",
  "azure-monitor-opentelemetry",
  "httpx>=0.27.0",
  "azure-core-tracing-opentelemetry",
  "opentelemetry-instrumentation-openai",
  "openai",
  "python-dotenv",
  "better-exceptions",
  "asgi_correlation_id",
  "colorlog",
]

[dependency-groups]
test = [
  "pytest",
  "pytest-cov",
  "pytest-mock",
]
types = [
    "mypy",  # static type checker
    "celery-types",
    "types-psutil",
]
dev = [
    "asgiref",
    "pre-commit",
    "faker",
    "poetry",
    "ipython",  # for notebooks development
    "ipykernel",  # for notebooks development
    {include-group = "test"},
    {include-group = "types"}
]

[tool.pytest.ini_options]
pythonpath = "."

[tool.ruff]
line-length = 90
indent-width = 4

[tool.ruff.format]
skip-magic-trailing-comma = true

[tool.ruff.lint]
# Only ignore variables named "_".
dummy-variable-rgx = "^_$"
ignore = [
    "COM812",   # Trailing comma missing
    "D1",       # Missing docstrings
    "D417",     # Missing argument description in the docstring
    "E203",     # Whitespace before punctuation
    "N806",     # Variable lowercase
    "SLF001",   # Private member accessed
]

[tool.ruff.lint.flake8-annotations]
ignore-fully-untyped = true
mypy-init-return = true

[tool.ruff.lint.flake8-unused-arguments]
ignore-variadic-names = true

[tool.ruff.lint.pydocstyle]
convention = "numpy"

[tool.ruff.lint.pylint]
max-args = 10
max-positional-args = 6

[tool.poetry]
package-mode = false

Poetry Runtime Logs

Paste the output of 'poetry -vvv <command>', over this line.

Start with poetry/utils/env/base_env.py around line 453 and poetry/utils/env/virtual_env.py around line 119, then inspect the packaging.tags.py mac_platforms stack trace. Compare the failing macOS 10.15.1 and Python 3.14 environment with a working environment, using the attached logs and sysconfig output. Done means the failure is reproducible and a regression test or documented fix covers the invalid platform-version parsing.