We have to create a function in Python 3 named grocery_store which...

We have to create a function in Python 3 named grocery_store which takes two formal parameters - the first (price_diction) which is a  dictionary with keys representing grocery items and values representing their item prices. The second formal parameter (customer_diction) is a dictionary where the keys are customers and the values are themselves dictionaries whose keys are grocery items and values are the quantity purchased by that customer. 

The  function should return a new dictionary with keys representing the grocery items sold that day, and values representing the total revenue taken in by selling that item.

Assumptions:

1. If an empty dictionary is passed in for either parameter, return an empty dictionary.

2. Each key in price_diction will be a string representing a grocery item, and each key's value in (price_diction) will be a numerical value.

3. Each key in customer_diction represents a customer, and each value will be a dictionary whose keys are grocery items and the values are the quantity of each item purchased.

4. The order of the key:value pairs in the new dictionary will be determined by the system. There is no need to try and sort on the keys or values.

5. Either of the dictionaries that are passed in shouldn't be affected. A new dictionary should be returned

6. The code should only add keys for dictionary items purchased by customers in customer_diction, not all of the items in price_diction.

7. It can be assumed that all of the items purchased by customers are in the price_diction . 

Function signature:

def grocery_store(price_diction, customer_diction):

# code

Example output:

>>>prices = {"banana":0.59, "cheese":1.99, "milk":3.49}

>>>sold = {"customer 1":{"banana":6, "cheese":3, "milk":1}, "customer 2":{"banana":1, "milk":2}} >>>grocery_store(price_dict,sold)

{'banana': 4.13, 'cheese': 5.97, 'milk': 10.47}