Hunting for an azeotrope

You will compare measured pressures of a pair of liquids with Raoult's law, sort each composition as ideal, positive or negative, and decide whether the pair has an azeotrope. The pressures are invented for liquids A and B and are in kPa.

The idea. The deviation is $\dfrac{P_{measured} - P_{Raoult}}{P_{Raoult}} \times 100\ \%$. A maximum in the measured pressure inside the graph means a minimum-boiling azeotrope.

Your tasks.

1. Complete deviation(x_a) so that it returns the percentage deviation at that composition.
2. Complete kind(x_a) so that it returns "positive" above Raoult's law by more than 2 %, "negative" below it by more than 2 %, and "ideal" otherwise.
3. Set highest to the mole fraction with the largest measured pressure.
4. Set has_azeotrope to True when that largest pressure is not at a pure liquid.