How to know that the interpreter is Jython or CPython in the code? [duplicate]

Question

Is there a way to detect that the interpreter that executes the code is Jython or CPython?

I have another post: Jython does not catch Exceptions. For this case, if I know the interpreter is Jython, I can have different code that should work.

if JYTHON: sys.path.insert(0, os.path.dirname(__file__)) from utils import * else: from .utils import *

Python is the language specification. The most well known implementations are Jython and CPython. — Jayanth Koushik
– Jayanth Koushik, Commented Mar 10, 2014 at 16:14
@JayanthKoushik: So, is your point that there is no (easy or programatic) way? — prosseek
– prosseek, Commented Mar 10, 2014 at 16:15
No no; I'm was pointing out that the interpreter is Jython or CPython, not Jython or Python. I think the edit makes it clear. — Jayanth Koushik
– Jayanth Koushik, Commented Mar 10, 2014 at 16:19
Is the Jython executable named jython.exe or is it just python.exe — wnnmaw
– wnnmaw, Commented Mar 10, 2014 at 16:27
Also see stackoverflow.com/questions/1854/python-what-os-am-i-running-on — devnull
– devnull, Commented Mar 10, 2014 at 16:36

Dr. Jan-Philip Gehrcke · Accepted Answer · 2014-03-10 16:27:17Z

There is an official way to do it! :-) Please have a look at

http://docs.python.org/2/library/platform.html#platform.python_implementation

Returns a string identifying the Python implementation. Possible return values are: ‘CPython’, ‘IronPython’, ‘Jython’, ‘PyPy’.

New in version 2.6.

I did not know that before.

Old answer:

There probably is no standardized interface, but you can use some educated guessing, based on e.g. sys.executable (http://docs.python.org/2/library/sys.html#sys.executable), and sys.version. Furthermore, some interpreters for sure provide features that are specific to them, which you can make use of.

Note: starting from python3.3 there's also sys.implementation which contains the name and version of the implementation and might contain other relevant information.

Community · Accepted Answer · 2017-05-23 12:10:48Z

I'm not sure this is safe way, but I got a hint from Find full path of the Python interpreter?.

With print sys.executable, I have different results.

context> jython context/context.py None context> python context/context.py /usr/bin/python

So, checking sys.executable might be one way for the checking.

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