Step 1: In terminal (console), run the following commands:
sudo add-apt-repository ppa:pyp/ppa
sudo apt-get update
sudo apt-get install pypy pypy-dev
Step 2: In terminal (console), type "pypy" and enter.
You will see the pypy prompt (>>>>). It is different from the python interpreter prompt (>>>)
>>>> - PyPy interpreter prompt [4 greater than symbols]
>>> - Python interpreter prompt [3 greater than symbols]
To check the difference, give exit() command and come out of pypy. Now, in terminal, type "python" and enter.
You will see again the python prompt (>>>)
