Python's poetry dependency manager allows specifying optional dependencies via command: $ poetry add --optional redis Which results in this configuration: [tool.poetry.dependencies] python = "^3.8" redis = {version="^3.4.1", optional=true} However how do you actually install them? Docs seem to hint to: $ poetry install -E redis but that just throws and error: Installing dependencies from lock file [ValueError] Extra [redis] is not specified. Continue reading...
