How can I tell which python implementation I'm using?

Question

Python has a few different implementations: CPython, Jython, PyPy, etc. I want to programmatically determine which implementation my code is running on. How can I do that?

Answer 1

In [50]: import platform    
In [52]: platform.python_implementation()
Out[52]: 'CPython'

Answer 2

How about platform

it gives you

platform.python_implementation()