How to specify git dependencies with conditional Python version in pyproject.toml?

[EwoutH]

I'm trying to install a package (statsmodels in this case) from git if on Python 3.11 or higher, and otherwise reguarly from PyPI. I would expect I have to specify it like this:

[project]
dependencies = [
    "numpy",
    "pandas",
    "statsmodels; python_version < '3.11'",
    "statsmodels @ git+https://github.com/statsmodels/statsmodels.git; python_version >= '3.11'",
]

But that results in the following error:

      configuration error: `project.dependencies[{data__dependencies_x}]` must be pep508
      DESCRIPTION:
          Project dependency specification according to PEP 508
      
      GIVEN VALUE:
          "statsmodels @ git+https://github.com/statsmodels/statsmodels.git; python_version >= '3.11'"
      
      OFFENDING RULE: 'format'

ValueError: invalid pyproject.toml config: `project.dependencies[{data__dependencies_x}]`.
configuration error: `project.dependencies[{data__dependencies_x}]` must be pep508
        "$id": "#/definitions/dependency",
        "title": "Dependency",
        "type": "string",
        "format": "pep508"
    }

Conditional Python version works:

[project]
dependencies = [
    "numpy",
    "pandas",
    "statsmodels; python_version < '3.11'",
]

Installing from git also:

[project]
dependencies = [
    "numpy",
    "pandas",
    "statsmodels @ git+https://github.com/statsmodels/statsmodels.git",
]

But when combined, setuptools can't parse is correctly.

Do I need to specify it differently? Or is this a bug?

(setuptools 65.5.0, and happens on all Python versions)

[jwodder]

I believe you simply need to insert a space between the URL and the semicolon; otherwise, the semicolon will be interpreted as part of the URL, resulting in a parse error.

[EwoutH]

That works, thanks, you're a hero!

[EwoutH]

I created a feature request to interpreted a semicolon as the end of an URL, or add an improved warning message: #3652

[avalonv]

Recently ran into this issue too. Would be lovely if this was more clearly documented.