From the Brython 2.0 announcement (http://lwn.net/Articles/587226/):
"Brython (Browser Python) is an implementation of Python 3 in the browser. Its goal is to be able to write client-side programs in Python instead of Javascript, with code inside tags <script type="text/python>...</script>. As opposed to solutions such as Pyjamas or Py2JS, the translation from Python to Javascript is done in the browser, it doesn't require a precompilation by a Python
program."
"Brython (Browser Python) is an implementation of Python 3 in the browser. Its goal is to be able to write client-side programs in Python instead of Javascript, with code inside tags <script type="text/python>...</script>. As opposed to solutions such as Pyjamas or Py2JS, the translation from Python to Javascript is done in the browser, it doesn't require a precompilation by a Python
program."