Back in the day there was 'grail', which was a browser in its own right. There may also have been a plug-in for other browsers, but I don't know any real details about them.
Python itself has deprecated the 'restricted execution' environment it had in previous versions, because ways to break out of the jail existed or were thought to exist, and nobody stepped forward and offered to spend the requisite time to create and validate (even in a hand-wavy kind of way) a new security model. If you want to write programs in Python and run them in today's browsers, the shortest path from here to there is jython. Several applet demos are available at http://www.jython.org/applets/index.html I have used Jython a little bit, but never seriously and not in the past few years. Jython implements an older version of the Python language, corresponding to cPython 2.1 if I remember correctly. Jeff
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