As a novice Python user, I found I could learn in an hour how to make a couple of basic graphs. It will take a bit of memorising to remember the forms, which are different for different graph types.

It has quite a steep learning curve, and the docs are not always great, but the main devs will usually respond quickly to queries via Twitter or StackOverflow, so support is available.

A very powerful and flexible library with good Pandas integration. I've previously had issues with compatibility between versions, but its now much more stable. Well worth taking the time to learn.