This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
No, neither of these require prerequisites. You can think of them as slightly different dialects of the original language, so close that if you know one, you also know 99% of what you need to know about the other. You can learn Python and then Jython, or Jython and then Python - either way, whichever one you learn second will be trivially easy. For the most part.