.mat NumPy has a built in matrix object, which is really just a 2D array. The only difference in using .mat as opposed to .array is that the operator * can be used for the usual matrix product. More ...

Dithering with GIMP, ImageMagick, and Pillow Mapping printer pins to NumPy matrices Python integration with CUPS using Tea4CUPS Custom fonts using NumPy and the Read-Font library (ported to Python 3) ...