[linsomniac]

"Vendoring" means including the library in your package. So instead of listing it in requirements.txt, you copy the code of the library.

[giantrobot]

You can get that by bundling up your venv. When you install a package is a venv it installs it into that venv rather than the system. As far as the venv is concerned it is the system Python. Unfortunately passing around a venv can be problematic, say between Mac and Linux or between different architectures when binaries are involved.