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    <p>Depending on the complexity and frequency of I/O, you could just post the parameters to a python CGI script and return the result in a JSON object</p> <p>First, in JS:</p> <pre><code>function doIO (data) { var request = new XMLHttpRequest(); request.onreadystatechange = function () { if (request.readyStatus == 4) { if (request.status == 200) { alert('Success!'); var data = JSON.parse(xmlhttp.responseText); // do something with response data } else { alert('Failure'!); } } }; request.open("POST", python_cgi, true); request.send(data); } </code></pre> <p>In python you would need to implement a CGI script to parse the data, figure out the requested I/O and perform it. Your python script could be something like the following:</p> <pre><code>import cgi, json, sys form = cgi.FieldStorage() command = form.getFirst('command') if command == "filePicker": # run tkinter file picker # build json response object elif commoand == "myIoCommand": # do some I/O # build json response object print "Status: 200" print "Content-Type: application/json" json.dump(response, sys.stdout) </code></pre> <p>See for example <a href="https://developers.google.com/maps/documentation/geocoding/#JSON" rel="nofollow">Google Maps' JSON responses</a> if you need some inspiration forming your json response object.</p> <p>If you need more frequent/complex I/O, maybe what you would have to do is set up a Python server with mirrored state to your application via smaller, more frequent AJAX calls. You can use a framework to make a RESTful app, or you can roll your own by subclassing from <a href="http://docs.python.org/2/library/basehttpserver.html" rel="nofollow"><code>BaseHTTPServer</code></a>.</p>
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