I wanna program a game and put it onto a NES/Genesis cartridge. Please Help.

[cloud1161]

Wasn't sure which topic to put this under.   Anyway, I want to program a game and put it onto either a NES cartridge or Sega Genesis cartridge.  Is this possible and if so how does one go about doing this?   I know you can buy blank cartridges, but how do you go about putting the game onto the cartridge?  Lastly, is there any primary language to use to do this?  I was thinking Python/Pygame but did not know if the language mattered much.   Thanks for all your help in advance.