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Skulpt is a Javascript implementation of Python 2.x. Python that runs in your browser!
www.skulpt.org
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HTML
<!DOCTYPE html>
<html>
<!--
Copyright 2007 The Closure Library Authors. All Rights Reserved.

Use of this source code is governed by an Apache 2.0 License.
See the COPYING file for details.
-->
<!--
  Author: arv@google.com (Erik Arvidsson)
-->
<head>
<title>Closure Unit Tests - goog.gears.FakeWorkerPool</title>
<script src="../base.js"></script>
<script>
  goog.require('goog.gears.FakeWorkerPool');
  goog.require('goog.gears.Worker.EventType');
  goog.require('goog.net.XmlHttp');
  goog.require('goog.testing.jsunit');
</script>
</head>
<body>
<script type='text/x-gears-worker-pool-js' id='workercode'>

var ONE = 1
var TWO = 2
var THREE = 3;

/*
 * Every message should be a JSON string
 */
google.gears.workerPool.onmessage = function(message, sender,
                                             opt_messageObject) {
  var obj;
  if (opt_messageObject && 'body' in opt_messageObject) {
    obj = opt_messageObject['body'];
  } else {
    obj = eval('(' + message + ')');
  }
  var commandId = obj[0];
  var params = obj[1];
  if (commandId == ONE) {
    google.gears.workerPool.sendMessage([1, ['one', params.toUpperCase()]],
                                        sender);
  } else if (commandId == TWO) {
    google.gears.workerPool.sendMessage([2, ['two', params.toUpperCase()]],
                                        sender);
  } else if (commandId == THREE) {
    google.gears.workerPool.sendMessage([3, ['three', params.toUpperCase()]],
                                        sender);
  }
};

</script>
<script>

var ONE = 1
var TWO = 2
var THREE = 3;

// Mock out XHR for createWorkerFromUrl().
goog.net.XmlHttp = function() {};
goog.net.XmlHttp.prototype.open = function(method, url, async) {};
goog.net.XmlHttp.prototype.send = function(data) {
  this.responseText = workerTestCase.getWorkerCode();
};

// Create a new test case.
var workerTestCase = new goog.testing.TestCase(document.title);

/** True once the test environment is set up. */
workerTestCase.isSetUp = false;

/** True once the page is ready for the test to be run. */
workerTestCase.isReady = false;

/** The number of tests recieved from the worker pool. */
workerTestCase.resultCount = 0;

/** Array of test results */
workerTestCase.results = [];

/** Array of tests */
workerTestCase.tests = [
  [ONE, 'one', 'ONE'],
  [TWO, 'two', 'TWO'],
  [THREE, 'three', 'THREE']
];

/** Sets up the test environment, adds tests and sets up the worker pools. */
workerTestCase.setUpTests = function() {
  this.log('Setting tests up');

  this.add(new goog.testing.TestCase.Test(
      'test worker results', this.testResults, this));

  this.isSetUp = true;

  var workerPool = new goog.gears.FakeWorkerPool;

  var worker = workerPool.createWorker(this.getWorkerCode());
  goog.events.listen(worker, goog.gears.Worker.EventType.MESSAGE, this);

  var workerFromUrl = workerPool.createWorkerFromUrl('dummyUrl');
  goog.events.listen(workerFromUrl, goog.gears.Worker.EventType.MESSAGE, this);

  var workers = [worker, worker, workerFromUrl];

  for (var i = 0; i < this.tests.length; i++) {
    workers[i].sendMessage([this.tests[i][0], this.tests[i][1]]);
  }
};

/** Gets the worker code. */
workerTestCase.getWorkerCode = function() {
  return document.getElementById('workercode').innerHTML;
};


/** Handles the worker's MESSAGE event . */
workerTestCase.handleEvent = function(e) {
  this.log('HandleEvent, type: ' + e.type + ', message: ' + e.message);
  if (e.type == goog.gears.Worker.EventType.MESSAGE) {
    var commandId = e.message[0];
    var params = e.message[1];
    this.handleCommand(commandId, params);
  }
};

/** Handles a command . */
workerTestCase.handleCommand = function(commandId, params) {
  //debug('receiving command: commandId=' + commandId + ', params=' + params);
  this.results.push([commandId, params[0], params[1]]);
  this.resultCount++;
  if (this.resultCount >= this.tests.length) {
    // Backwards compatability for JsUnit to start tests
    setUpPageStatus = 'complete';
    this.isReady = true;
  }
};

/** Tests the results. */
workerTestCase.testResults = function() {
  this.log('Starting testResults');

  // TODO(user): This test is intermitently failing in IE7.
  return;

  for (var i = 0; i < this.tests.length; i++) {
    for (var j = 0; j < this.tests[i].length; j++) {
      assertEquals(this.tests[i][j], this.results[i][j]);
    }
  }
};

/** Waits until the tests are ready to begin, before running them. */
workerTestCase.runTests = function() {
  if (!this.isSetUp) {
    this.setUpTests();
  }
  if (this.isReady) {
    this.execute();
  } else {
    this.log('Not ready, waiting');
    // Try again in 100ms
    setTimeout('workerTestCase.runTests()', 100);
  }
};

/** Used by the JsUnit test runner. */
function testResults() {
  workerTestCase.testResults();
}

/** Used by the JsUnit test runner. */
function setUpPage() {
  workerTestCase.runTests();
}

/** Standalone Closure Test Runner. */
if (typeof G_testRunner != 'undefined') {
  G_testRunner.initialize(workerTestCase);
}


</script>
</body>
</html>