Can python modules be used from Java programs using Jython without modification?

In general: most Python-only code should work with Jython - however like in all cases: you have to test, test, test. Good written modules provide unittests - so you should try to run the tests from Jython and see what's happening.

Python modules can depend on certain Python versions (e.g. Python 3 vs Python 2 and even may require a minimum Python version (e.g. 2.6) in case of using dedicated language features introduced in some Python version) Python modules may depend on C extensions which won't work with Jython Python modules may use CPython features that are not available in Jython In general: most Python-only code should work with Jython - however like in all cases: you have to test, test, test. Good written modules provide unittests - so you should try to run the tests from Jython and see what's happening.

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