["python","cpython"]
How can I tell which python implementation I'm using?

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? To be specific, I'm looking for a function, say, get_implementation_name(), that could be used like so: impl_name = get_implementation_name() if impl_name == "CPython": print "I can abuse CPython implementation details. (I'm a bad, bad man.)" elif impl_name == "PyPy": print "Can't count on reference-counting garbage collection here..." else: print "I better be careful..."
In [50]: import platform In [52]: platform.python_implementation() Out[52]: 'CPython' Docs: platform.python_implementation