Last time I used it, the Python package isn't shipped as a wheel, so you have to compile dlib from source using CMake on install. Makes it harder to use for Python devs.
> Collecting dlib
> Downloading dlib-19.22.0.tar.gz (7.4 MB)
> || 7.4 MB 14.7 MB/s
> Building wheels for collected packages: dlib
I had not noticed before because I have only used dlib on Google Colaboratory, where it is thankfully pre-installed.