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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.

There is a newer version: 2.7.4

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import sys
import os
dir = os.path.dirname(sys.argv[0])
scriptsdir = os.path.normpath(os.path.join(dir, os.pardir, 'scripts'))
sys.path.append(scriptsdir)
from test_support import *

print 'Bug Fixes'
print 'From 1.0.0 to 1.0.1'
print 'Recursive assignment to list slices handled incorrectly #1'

x = [1,2,3,4,5]
x[1:] = x
assert x == [1,1,2,3,4,5]

print 'sys.platform should be javax.y.z not jdkx.y.z #4'

import sys
assert sys.platform[:4] == 'java'

print 'java.io.IOExceptions are mangled into IOErrors #5'

from java import io, lang
try:
    io.FileInputStream("doesnotexist")
    raise TestFailed
except io.FileNotFoundException:
    pass

try:
    io.FileInputStream("doesnotexist")
    raise TestFailed
except IOError:
    pass


print 'java.util.Vector\'s can\'t be used in for loops #7'

from java.util import Vector

vec = Vector()
vec.addElement(1)
vec.addElement(10)
vec.addElement(100)

sum = 0
for x in vec:
    sum = sum+x
assert sum == 111

print 'Exception tuple contains nulls #8'

str(Exception)

print '0.001 comes out as 0.0010 #11'

assert str(0.001) == '0.001'

print "thread.LockType doesn't exist #12"

import thread
assert hasattr(thread, 'LockType')

print 'sys.exit can only be called with an integer argument #13'

import sys
try:
    sys.exit("goodbye")
except SystemExit, exc:
    # exc is an instance now
    assert str(exc) == "goodbye"

print '"%012d" % -4 displays "0000000000-4" #15'

assert "%012d" % -4 == "-00000000004"


print 'Indexing a string with starting slice larger than string length throws StringIndexOutOfBoundsException #19'

assert "a"[10:] == ""

print 'Java exception thrown for non-keyword argument following keyword #20'

def foo(x,y=10): pass

try:
    exec("foo(y=20, 30)")
    raise TestFailed
except SyntaxError:
    pass

print 'Java field names which conflict with Python reserved words are not renamed #23'

# In JPython 1.1, the registry entry python.deprecated.keywordMangling sets
# whether trailing underscore is still used to `escape' Python keywords when
# used as attributes.  This is current set to true, but will eventually be
# turned to false.
assert hasattr(lang.System, 'in_') or hasattr(lang.System, 'in')

print 'Bad input to __import__ raises a Java exception #27'

try:
    __import__("")
    raise TestFailed
except ValueError:
    pass

print 'xrange implementation is broken for almost any complex case #29'

assert list(xrange(10)[9:1:-1]) == [9, 8, 7, 6, 5, 4, 3, 2]

print 'Trying to assign to a method of a Java instance throws a NullPointerException #30'

from java.awt import Button
b = Button()
try:
    b.setLabel = 4
    raise TestFailed
except TypeError:
    pass


print 'From 1.0.1 to 1.0.2'
print 'A threading test'

from java.lang import Thread

class TestThread(Thread):
    def run(self):
        for i in range(100):
            exec("x=2+2")
        print '       finished'

testers = []
for i in range(10):
    testers.append(TestThread())

for tester in testers:
    tester.start()