Comment by m_mueller
8 years ago
Regarding the GIL I‘ve always wondered about Jython but never gotten around to trying it. What are the drawbacks of running it on a JVM to get true multithreading? Having to properly sync the threads like in other environments without global locks?
Nothing, it's just not maintained. People realized, that yeah, python is nice, but why spend years reimplementing it on the JVM, when there's Kotlin. (And Java itself is quite a breeze to program in nowadays. And of course Scala, if you dare go beyond the Pythonic simplicity.)
Jython doesn't look completely unmaintained: https://hg.python.org/jython
It's also not completely obsoleted by Kotlin, e.g. for the use case of calling a Python library from Java. However, the Python semantics are not a great fit for the JVM, so you should expect it to be slower than plain CPython: https://pybenchmarks.org/u64q/jython.php