Write a script to follow a predetermined path

So, we now get to the first behavior that feels like a robot.

Let's make a quick sketch of a path for us to get our robot to follow:

Path for our robot

In the previous diagram, I've drawn a path. The straight lines are for driving forward, the 1s mean one second. We don't yet have a way to consider distance traveled, only time. We may be able to guess at times relative to distances, but they will not be very precise. The gentle curves are a turn where we slow one motor down with respect to the other.

The final spiral means a victory spin on the spot when the path is complete—we can do this by putting one motor in reverse while the other drives forward.

Let's write this code. First, we want the imports, sleep and robot. But before we do anything, let's make some helper functions for this behavior...