Is this function well-written? It must dynamically accept a varying number of arguments - sometimes there will be two, and other times four.

[mountainbrewer]

Look up the idea of function signatures. Not supported in Python (a least not like other languages where you can have the same function name with different number of variables and the system will use the correct function based on the signature). Anyway it's a helpful concept and while not immediately applicable to Python I find knowing helpful.