There is a Python port for FreeBSD.

Can you add 'Python for FreeBSD' to the webpage "Download Python for Other Platforms":
https://www.python.org/download/other/

To install the latest Python and Pip for version agnostic scripts, just do this:
pkg install python
python -m ensurepip --default-pip

To explicitly install Python3.x and Pip, just do this:
pkg install python3
python3 -m ensurepip --default-pip

More information about the port is here:
https://www.freshports.org/lang/python/