I have a Python3 Poetry project with a pyproject.toml file specifying the dependencies:
[tool.poetry.dependencies]
python = "^3.10"
nltk = "^3.7"
numpy = "^1.23.4"
scipy = "^1.9.3"
scikit-learn = "^1.1.3"
joblib = "^1.2.0"
[tool.poetry.dev-dependencies]
pytest = "^5.2"
I export those dependencies to a requirements.txt file using the command poetry export --without-hashes -f requirements.txt --output requirements.txt resulting in the following file requirements.txt:
click==8.1.3 ; python_version >= "3.10" and python_version < "4.0"
colorama==0.4.6 ; python_version >= "3.10" and python_version < "4.0" and platform_system == "Windows"
joblib==1.2.0 ; python_version >= "3.10" and python_version < "4.0"
nltk==3.8.1 ; python_version >= "3.10" and python_version < "4.0"
numpy==1.24.1 ; python_version >= "3.10" and python_version < "4.0"
regex==2022.10.31 ; python_version >= "3.10" and python_version < "4.0"
scikit-learn==1.2.1 ; python_version >= "3.10" and python_version < "4.0"
scipy==1.9.3 ; python_version >= "3.10" and python_version < "4.0"
threadpoolctl==3.1.0 ; python_version >= "3.10" and python_version < "4.0"
tqdm==4.64.1 ; python_version >= "3.10" and python_version < "4.0"
that I use to install the dependencies when building a Docker image.
My question: How can I omit the the colorama dependency in the above list of requirements when calling poetry export --without-hashes -f requirements.txt --output requirements.txt?
Possible solution: I could filter out the line with colorama by producing the requirements.txt file using poetry export --without-hashes -f requirements.txt | grep -v colorama > requirements.txt. But that seems hacky and may break things in case the Colorama requirement is expressed across multiple lines in that file. Is there a better and less hacky way?
Background: When installing this list of requirements while building the Docker image using pip install -r requirements.txt I get the message
Ignoring colorama: markers 'python_version >= "3.10" and python_version < "4.0" and platform_system == "Windows"' don't match your environment
A coworker thinks that message looks ugly and would like it not to be visible (but personally I don't care). A call to poetry show --tree reveals that the Colorama dependency is required by pytest and is used to make terminal colors work on Windows. Omitting the library as a requirement when installing on Linux is not likely a problem in this context.
The colorama dependency is required by pytest.
I suppose your Docker image is for production use, so it doesn't have to contain pytest which is clearly a development dependency.
You can use poetry export plugin:
poetry export --without-hashes --without dev -f requirements.txt -o requirements.txt to prevent your dev packages to be exported to the requirements.txt file so they won't be installed by pip install.
The plugin is no longer installed by default with Poetry 2.0.
You can find some poetry export options Here.