Question

I currently have a code that I have written that uses global variables. My professor wants me to rewrite this code so that it uses the return function instead. I dont understand why because it works the same, but I am not great at using return and barely understand it. here is my code. This is in Python3

#Created an empty dictionary using variable
#grocery_item
grocery_item = {}
#Created an empty list for using variable
#grocery_history
grocery_history = []

#This is the variable our loop is based off with the
#value 'go'
stop = 'go'
#Using a while loop to tell the computer
#that as long as the user does not enter 'q', the
#program will continue to iterate
while stop != 'q':
#Giving variables for items in list for user to input
item_name = input('item name:\n')
  
quantity=input("Quantity purchased:\n")
  
cost = input("Price per item:\n")
#modifying the dictionary by adding values to the keys   
grocery_item = {'name': item_name, 'number': int(quantity), 'price':float(cost)}
#Used the append method to add grocery_item to
#grocery_history list
grocery_history.append(grocery_item)
  
stop = input("Would you like to enter another item?\nType 'c' for continue or 'q' to quit:\n")

#Variable for the grand total
grand_total=0
  
#Using a for loop to iterate over the grocery_item
# in grocery_history
for grocery_item in grocery_history:
  
  
#Here I access the values in the dictionary grocery_item
#by calling them in brackets. i.e ['number'] and ['price']
item_total = grocery_item['number'] * grocery_item['price']
  
grand_total += item_total
#modified values in the dictionary to show up as currency
#by using $%.2f and to moving the decimal to the right place.
print('%d %s @ $%.2f ea $%.2f' % (grocery_item['number'], grocery_item['name'],grocery_item['price'],item_total))
  
item_total = 0
#Print the grand total
(print('Grand total: $%.2f' % grand_total))

Answer 1

CODE

=============

#Created an empty dictionary using variable

#grocery_item

grocery_item = {}

#Created an empty list for using variable

#grocery_history

grocery_history = []

def getGroceryTotalBill():

#This is the variable our loop is based off with the

#value 'go'

stop = 'go'

#Using a while loop to tell the computer

#that as long as the user does not enter 'q', the

#program will continue to iterate

while stop != 'q':

#Giving variables for items in list for user to input

item_name = input('item name: ')

quantity=input("Quantity purchased: ")

cost = input("Price per item: ")

#modifying the dictionary by adding values to the keys

grocery_item = {'name': item_name, 'number': int(quantity), 'price':float(cost)}

#Used the append method to add grocery_item to

#grocery_history list

grocery_history.append(grocery_item)

stop = input("Would you like to enter another item? Type 'c' for continue or 'q' to quit: ")

#Variable for the grand total

grand_total=0

#Using a for loop to iterate over the grocery_item

# in grocery_history

for grocery_item in grocery_history:

#Here I access the values in the dictionary grocery_item

#by calling them in brackets. i.e ['number'] and ['price']

item_total = grocery_item['number'] * grocery_item['price']

grand_total += item_total

#modified values in the dictionary to show up as currency

#by using $%.2f and to moving the decimal to the right place.

print('%d %s @ $%.2f ea $%.2f' % (grocery_item['number'], grocery_item['name'],grocery_item['price'],item_total))

item_total = 0

#return the grand total

return grand_total

if __name__ == "__main__":

(print('Grand total: $%.2f' % getGroceryTotalBill()))