If you have your own keyboard and HDMI display you could go for one of our Zero W project kits, like: https://shop.pimoroni.com/products/mood-light-pi-zero-w-project-kit
It might be a little on the deep-end, but you could install Raspbian Jessie Lite on an SD card and start programming Python at the command-line - re-creating those C64/BBC Micro/Amiga experiences of yore and old.
The Pi 3 is pricier, but it’s also a lot easier to hook up to a display, keyboard, mouse and more capable of running a full desktop environment if you want something that feels a bit more familiar (depending on how much tinkering you’ve done with Linux, or the Command-Line). There are also some good hand-holding Python IDEs now, which will be easier to work with.
Of course, you can run a desktop environment on a PI Zero, but to get a mouse and keyboard connected you’ll either need a set with a wireless dongle or a USB hub.
The Python IDE Thonny may be a good place for you to start: https://www.raspberrypi.org/magpi/thonny/
My generic Python getting-started guides might be useful:
And, of course, you always have the fine folks of the forums to help you when you get stuck!