Create a grocery calculator

It will take in key-value pairs for items and their prices, and return the subtotal and total, and can print out the list for you for when you're ready to go to the store.

'''Algorithm:

User enters key-value pairs that are added into a dict.

Users tells script to return total, subtotal, and key-value pairs in a nicely formatted list.'''

The use of classes and @classes should be used.

I wrote this code below:

class GroceryList(dict):

def __init__(self):

self = {}

def addToList(self, item, price):

self.update(item, price)

def subtotal(self):

subtotal = 0

for price in self:

subtotal += price

return subtotal

def total(self):

total = 0

for price in self:

total = price + (price * .07)

return total

def printList(self):

return(self)

list = GroceryList()

list.item1 = ('milk', '3.79')

list.item2 = ('bread', '2.25')

list.item3 = ('eggs', '1.25')

The issue I am experiencing is the output is the following:

{}

None

None

I'm unsure of how to resolve this issue. Any advice would help. Thanks!