There are more than enough histogramming packages for python out in the wild, and some have a lot of functionality beyond dropping data into bins. This package is just for dropping data into bins, but as fast as possible (on a CPU), while also keeping a simple code base. Another property of histograms lacking from other options is the ability to retrieve the sum of weights in each bin. Finally, I thought it would be fun to learn how to write software with pybind11.