PY108: Functions, Errors and a Final Project

Learn to define functions with parameters, return values and default values, use try/except to handle ValueError and ZeroDivisionError, import the math module, and structure a complete program in small functions. Build a mini shop that reads orders and prints a receipt. This is part 8 of 8 in the Python Programming Foundations specialization for beginners learning on Android phones in Sierra Leone and West Africa.