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Jython is an implementation of the high-level, dynamic, object-oriented language Python written in 100% Pure Java, and seamlessly integrated with the Java platform. It thus allows you to run Python on any Java platform.

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import inspect
import os.path
import sys
import unittest
from test import test_support
from regrtest import runtest

def make_fib_function():
    from org.python.core import PyBytecode, PyFunction

    # The code below was compiled from
    # def fib(x):
    #    if x == 0 or x == 1:
    #        return 1
    #    else:
    #        return fib(x-1)+fib(x-2)

    co_argcount = 1
    co_nlocals = 1
    co_stacksize = 4
    co_flags = 67
    co_code = '|\x00\x00d\x01\x00k\x02\x00s\x18\x00|\x00\x00d\x02\x00k\x02\x00r\x1c\x00d\x02\x00St\x00\x00|\x00\x00d\x02\x00\x18\x83\x01\x00t\x00\x00|\x00\x00d\x03\x00\x18\x83\x01\x00\x17Sd\x00\x00S'
    co_consts = (None, 0, 1, 2)
    co_names = ('fib',)
    co_varnames = ('x',)
    co_filename = ''
    co_name = 'fib'
    co_firstlineno = 1
    co_lnotab = '\x00\x01\x18\x01\x04\x02'
    co_freevars = ()
    co_cellvars = ()

    c = PyBytecode(
        co_argcount, co_nlocals, co_stacksize, co_flags,
        co_code,  co_consts, co_names, co_varnames,
        co_filename, co_name, co_firstlineno, co_lnotab, co_freevars, co_cellvars)

    return PyFunction(c, globals())

fib = make_fib_function()

class PyBytecodeTest(unittest.TestCase):

    def test_fib(self):
        expected_fib = [1,1,2,3,5,8,13,21,34,55]
        for i in range(10):
            self.assertEquals(fib(i), expected_fib[i])

class AdhocRegrtest(unittest.TestCase):

    def setUp(self):
        self.old_verbosity = test_support.verbose
        test_support.verbose = 0
        import pycimport
        sys.path.insert(0, os.path.join(os.path.split(inspect.getfile(self.__class__))[0], 'pbcvm'))

    def test_regrtest_pyc(self):
        for test in (
            # change the names a bit so we don't have to worry about module unloading or spawning a separate JVM
            # however, this testing approach too limits the tests that can be run, so we should rewrite to
            # use subprocess asap
            'test_types_pyc',
            'test_exceptions_pyc'):
            test_times = []
            ok = runtest(test, False, True, test_times)
            print "got", ok
            self.assertTrue(ok > 0)

    def tearDown(self):
        # typical unsafe ops we have to do in testing...
        test_support.verbose = self.old_verbosity
        sys.path.pop(0)
        sys.meta_path.pop(0)


def test_main():
    test_support.run_unittest(
        PyBytecodeTest,
        # AdhocRegrtest   # reinstate once we have Python bytecode compilation, too hard to coordinate otherwise
    )

if __name__ == "__main__":
    test_main()