Poetry supports the use of PyPI and private repositories for discovery of packages as well as for publishing your projects.
By default, Poetry is configured to use the PyPI repository, for package installation and publishing.
So, when you add dependencies to your project, Poetry will assume they are available on PyPI.
This represents most cases and will likely be enough for most users.
Private Repository Example Installing from private package sources By default, Poetry discovers and installs packages from PyPI..