There are many different ways to install Python (and therefore pip) on macOS. If you’re struggling with this, here are a few things to try.
If pip is already installed:
pip install --upgrade pip
If you get an error about the pip command not being found, the easiest thing to do is use your Python interpreter:
python -m pip install --upgrade pip
Some installations will also install an alias called pip3:
pip3 install --upgrade pip
If you already have a version of Python installed that does not have pip, you can manually install pip:
curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py python get-pip.py
Another option is to update your Python installation. New installations of Python usually come with pip out of the box and there are a few ways to do this on Mac.
Installing Python With Homebrew:
brew install python
You can also download the installer from python.org.
Or download the installer from Anaconda. This is what I recommend for scientific computing.