Set up Python 3 and pip 3 as default

One of the most common headaches when working with Python is having to remember to use Python 3.x instead of Python 2.x. Luckily, it's really easy to setup Python 3 and pip 3 as the defaults. You first need to figure out where each one is installed using the which command:

which python3   # /usr/local/bin/python3
which pip3      # /usr/local/bin/pip3

Make a note of each response, so that you can add the paths as aliases to your shell environment's configuration file. Then, you can use echo to add a line for each one to either .zshrc or .bashrc depending on your environment:

# Linux or other bash environment
echo "alias python=/usr/local/bin/python3" >> ~/.bashrc
echo "alias pip=/usr/local/bin/pip3" >> ~/.bashrc

# Mac OS or other zsh environment
echo "alias python=/usr/local/bin/python3" >> ~/.zshrc
echo "alias pip=/usr/local/bin/pip3" >> ~/.zshrc

And you're all done! python and pip are both mapped to their 3.x versions,