Simple Inkscape Scripting makes it easy to automate repetitive drawing tasks. It defines a simple set of Python functions such as "rect" to draw a rectangle and "line" to draw a line. For example, the one-line program "for r in range(7, 0, -1): circle((100, 100), 10*r, fill=['white','red'][r%2])" is all it takes to draw a bullseye. Invoking the extension (Extensions → Render → Simple Inkscape Scripting…) brings up a dialog box that lets you load a Python script from a file or enter Python code directly in a text box. Shapes produced by the script appear directly on the canvas and can be edited just like any other shape. See https://github.com/spakin/SimpInkScr for details and examples.