The packages are either python3 or python2 for the language, and prefixed py2- or py3- for any of the packaged modules. https://pkgs.alpinelinux.org/ does support wildcards so you should find the packages using "python?" or "py?-*".
There is a pretty good set of maintainers/packagers that compile Python libs for Alpine, but if you stumble across one that doesn't have a binary built, you're going to have to install the whole build toolchain and get all the headers yourself. The pre-compiled manylinux* binary packages on PyPI aren't compatible with Alpine.