Is there any way to make a function (the ones I'm thinking of are in the style of the simple ones I've made which generate the fibonnacci sequence from 0 to a point, and all the primes between two points) run indefinitely. E.g. until I press a certain key or until a time has passed, rather than until a number reaches a certain point?
Also, if it is based on time then is there any way I could just extend the time and start it going from that point again, rather than having to start again from 0? I am aware there is a time module, i just don't know much about it.
The simplest way is just to write a program with an infinite loop, and then hit control-C to stop it. Without more description it's hard to know if this works for you.
If you do it time-based, you don't need a generator. You can just have it pause for user input, something like a "Continue? [y/n]", read from stdin, and depending on what you get either exit the loop or not.