A website with pictures, an embedded video and downloadable 32bit Windows exes or perhaps an Android APK* of the game is usually your best bet.
This also has the added benefit of letting your viewers get a local copy of your game to pass around so not having to worry about internet streaming which is quite a benefit (whereas many web games need internet or a small local html server (like mongoosehttpd) to be provided). Or even worse, they need horrible web plugins**!
With Python, you might want to use a packaging system since Python isn't very common on Windows machines for a typical user. If you can modify your install of python to be portable, then you might have some luck creating a self extracting .exe using WinRAR.
* Android is the most common tablet OS (rivaling even that of desktop systems) and seeing as you are not trying to sell your showcase game (at this point in time) your viewers can sideload it without the faff of developer certificates from something like iOS or Metro.
Edited by Karsten_, 14 October 2013 - 11:46 AM.