program4design.py

#Graham Hough
#Section 15
#Program 4 Design
#program4design.py
#Purpose: To open files and read UPC codes, then print a reciept.
#Preconditions: Files contiaining inventory and upc codes to read
#Postconditions: None

#Preconditons: Files to call to open
#Postconditions: Program ends
#def main():
  #call the function get_data_from_file(inventory) and save it in a varible (inventory_string?)
  #call the function get_data_from_file(transactions) and save it in a varible(transaction_string)
  #in main compare the data from inventory_string and transaction_string
  #run print_reciept(inventory_string, transaction_string)


#preconditions: The name of the file
#postconditions: To return the string of upc codes and items
#def get_data_from_file(name):
  #open the file(by name)
  #do data validation to make sure the program exists, has data, and is readable
  #parse the file by new line
  #create a list from the file
  #validate the data from the list
  #create a loop here to vaildate each upc code
  #For i in...
    #call check_UPC(i) for each line with a upc
    #if the return value is true allow it
    #if the return value is false, remove it from the list.
  #turn the list into a string.
  #return the string

#Preconditions: UPC codes to read from
#Postconditions: return true or false for a valid code
#def check_UPC(value):
  #check the legnth of the upc code
  #if too long or too short return false
  #Take the value and save it
  #run value through the algorithem for the check digit
  #compare the two values
  #if the values are valid upc codes then return true
  #else return false

#precondtions: running the entire program before this
#postconditions: print outputs and end the program
#def print_recipt(one, two):
  #Take the strings of items named one and two and compare them
  #run a loop for each line of the string
    #print each item, while consolidating multiple items
    #print the price of the items
    #print a subtotal so far
    #when out of lines to read save the running total
    #take into account weather the item has tax or not
    #if tax then print that into account in the subtotal
    #add the taxed ammount to the total
  #print the total number of taxable items
  #print the total number of food items (no tax)
  #print the complete running total
  #print the total tax
  #print the total bill
  #print the total items sold

#run main(), starting the program.