Documentation for vendotron.py. More...

Functions
def	vendotron.getChange (self, price, payment)
	A function to calculate the change from a transaction. More...

def	vendotron.VendotronTask ()
	A generator function that implements a finite state machine of the Vendotron vending machine. More...

def	vendotron.kb_cb (key)
	Callback function which is called when a key has been pressed.

Variables
dictionary	vendotron.stateMsgs
	A dictionary of descriptive messages for each state, used for debugging.1. More...

list	vendotron.moneyKeys = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']

string	vendotron.last_key = ''
	The last key pressed on the keyboard.

dictionary	vendotron.denomValues
	A dictionary of the cent values of each currency denomination. More...

int	vendotron.paymentCents = 0
	the payment value in cents

dictionary	vendotron.chng = {}
	A dictionary of change from the transaction.

int	vendotron.centsLeft = paymentCents - price
	The cents remaining to be turned into change.

dictionary	vendotron.v = denomValues[d]
	The cents value of the current denomination.

	vendotron.n = floor(centsLeft/v)
	The number of the current denomination needed for change.

def	vendotron.vendo = VendotronTask()

Detailed Description

Documentation for vendotron.py.

This Python program simulates the opperation of a vending machine called the Vendotron.

The Vendotron sells four different types of drinks:

Cuke, $1.00
Popsi $1.20
Spryte $0.85
Dr. Pupper $1.10

To enter money into the machine the user can press numbers 0-9 on their keyboard, which correspond to increasing monetary denominations (1 = pennies, 2 = nickles, etc.). To select the drink they want the user can press 'c' for Cuke, 'p' for Popsi, 's' for Spryte, and 'd' for Dr. Pupper. To eject any remaining change the user can press 'e'.

Author: Eliot Briefer

Date: Apr. 22, 2020

Function Documentation

◆ getChange()

def vendotron.getChange	(	self,
		price,
		payment
	)

A function to calculate the change from a transaction.

Parameters

price	An integer representing the price in cents
payment	A dictionary of the payment bills {'pennies': 0, 'ones' : 0, ...}

Returns: A dictionary of the same form as payment with the change from the transaction returns None if payment is insufficient.

◆ VendotronTask()

def vendotron.VendotronTask ( )

A generator function that implements a finite state machine of the Vendotron vending machine.

The state machine for the Vendotron is shown below:

Variable Documentation

◆ denomValues

dictionary vendotron.denomValues

Initial value:

 =  {'hundereds' : 10000,
               'fifties' : 5000,
               'twenties' : 2000,
               'tens' : 1000,
               'fives' : 500,
               'ones' : 100,
               'quarters' : 25,
               'dimes' : 10,
               'nickles' : 5,
               'pennies' : 1}

A dictionary of the cent values of each currency denomination.

◆ stateMsgs

dictionary vendotron.stateMsgs