Rapydscript by Alexander Tsepkov is a Python to JavaScript translator that really kicks ass. It is stable, the transpiler can be run fully client side, produces very fast JavaScript, and is well maintained by Alex. Rapydscript syntax is very similar to PythonJS, and both can be used together in the same markdown file compiled by Rusthon.
Rapydscript has the right mix of Pythonic-style and features to make it inter-operate well with JavaScript. Alex made all the right choices on what parts of Python to throw away, and adapting the syntax to the requirements imposed by generating fast JavaScript. Check out this example for how to use Rapydscript in Rusthon.
