I ran the Python 3.5.1 installer from https://www.python.org/downloads/release/python-351/. However, on the command line, when I go to run pip, I see an error:
pip
The solution is to get the latest pip installer script from: https://bootstrap.pypa.io/get-pip.py, and install it with python get-pip.py.
python get-pip.py
Then you can use commands like python -m pip ... to your heart's content.
python -m pip ...