[Python] How to conditionally install modules using pip with pyproject.toml?

I'm trying to set different user-versions inside the same directory, so when using pip install . only the basic version module should be installed, namely only installing foo_tool. When using pip install .[extension] an additional module should be installed, foo_tool_extension.

My Problem: When running pip install . I want only the foo_tool module to be installed. When running pip install .[extension] I want the additional foo_tool_extension module to be installed. However, depending on my pyproject.toml configuration:

• Both foo_tool and foo_tool_extension get installed, regardless of whether I specify the [extension] option.
• Only the dist-info file is installed, but neither of the modules (foo_tool or foo_tool_extension) are installed.

c:\users\thetelefone\anaconda3\envs\test_env\lib\site-packages\foo_tool-0.6.dist-info\*
c:\users\thetelefone\anaconda3\envs\test_env\lib\site-packages\foo_tool\*
c:\users\thetelefone\anaconda3\envs\test_env\lib\site-packages\foo_tool_extension\*


or only

c:\users\thetelefone\anaconda3\envs\test_env\lib\site-packages\foo_tool-0.6.dist-info\*


with both modules missing.

My structure has the following layout:

/foo_project
├── src
│ ├── foo_tool
│ │ ├── __init__.py
│ │ ├── foo_problem.py
│ │ ├── foo_plotting.py
│ ├── foo_tool_extension
│ │ ├── __init__.py
│ │ ├── foo_problem_extension.py
├── tests
│ ├── ...
├── README.md
├── pyproject.toml


Both __init__.py files are empty. Currently my pyproject.toml looks like the following. I tried several different options, but always resulting in the behavior above.

[project]
name = "foo_tool"
version = "0.6"
authors = [{name = "thetelefonecopmpany"}]
description = "Foo-Tool for fools."
requires-python = ">3.6"
dependencies = [
"matplotlib",
"pandas",
"numpy",
"openpyxl"
]

[build-system]
requires = ["setuptools>=61.0"]
build-backend = "setuptools.build_meta"

[tool.setuptools.packages.find]
where = ["src"]
exclude = ["foo_tool_extension"]

[project.optional-dependencies]
extension = [
"scipy>=1.7.0",
"foo_tool_extension @ file://src/foo_tool_extension"
]



How can I configure my pyproject.toml file to achieve this behavior?
Please also help me to improve this question. Thanks in advance!

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