Marc

`mypy` is probably a good choice, assuming we can make it work with travis -- it's been around for a while (and is the only type checker I've used before).

Here's a [patch](https://github.com/zulip/zulip/commit/c80f6993211011fc995270114f51d38a2f0489c0) that another project used to incorporate `mypy`.

Thanks @juliahou8 and @souravsingh for getting the ball rolling on this issue!

Whenever possible other than tests IMO.

I've played with it -- so far I've tried to use mpl's transformations and contour functions. The main difference versus `ternary`'s current API is how mpl expects the data (numpy...

@ojtwist Sorry for not responding to the request above. All I did back then was to project the data with ternary's functions and then use matplotlib's contour function. You could...

I'm sure there are useful scenarios for contour plots, but I don't have a personal need for them at the moment nor a lot of extra time to spend implementing...

@btweinstein Do you mind if I add that plot as an example to the readme?

A hacky way to plot the actual contours for some points would be to use `matplotlib`'s contour function to compute the contours ([example here](https://stackoverflow.com/questions/18304722/python-find-contour-lines-from-matplotlib-pyplot-contour)), transform the data from `numpy` arrays...

Thanks @maximweb ! Feel free to open a PR to add this to the examples.