For Python 2.7, it’s just called pypy . For CPython, if you would like to run Python 3 from the terminal, you simply enter the command python3 . To run PyPy, simply issue the command pypy3 . Entering the pypy3 command in the terminal might return the Command ‘pypy3’ not found message, as shown in the next figure.

What version of Python does PyPy support?

PyPy comes in two versions: one is fully compatible with Python 2.7; the other is fully compatible with one 3. x version.

Is PyPy faster than Cython?

The PyPy implementation is 16 times faster than the CPython implementation and about 3 times slower than the Cython implementation. This is fascinating since PyPy is running the exact same pure Python code as the CPython implementation – it shows the power of PyPy’s JIT compiler.