ContourPy is a Python library for calculating contours of 2D quadrilateral
 grids. It is written in C++11 and wrapped using pybind11.
 .
 It contains the 2005 and 2014 algorithms used in Matplotlib as well as a newer
 algorithm that includes more features and is available in both serial and
 multithreaded versions. It provides an easy way for Python libraries to use
 contouring algorithms without having to include Matplotlib as a dependency.