Functions as everyday items

def donation_box(coin): Do you get anything back (directly)? No. So this is a void function.

def recycling_bin(paper, plastic, other): Do you get anything back (directly)? No. So this is a void function.

def gumball_machine(coin): Do you get anything back (directly)? Yes, candy! So this is a value-returning function.

def traffic_light(): Clearly you don’t pass anything to the traffic light, so no arguments and hence no parameters, but do you get something from “using” the traffic light? Yes, a traffic signal. So this is a value-returning function.