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"""

*TL;DR

Separates presentation, application processing, and data management functions.

"""

from collections.abc import KeysView

class Data:

"""Data Store Class"""

products = {

"milk": {"price": 1.50, "quantity": 10},

"eggs": {"price": 0.20, "quantity": 100},

"cheese": {"price": 2.00, "quantity": 10},

}

def __get__(self, obj, klas):

print("(Fetching from Data Store)")

return {"products": self.products}

class BusinessLogic:

"""Business logic holding data store instances"""

data = Data()

def product_list(self) -> KeysView[str]:

return self.data["products"].keys()

def product_information(self, product: str) -> dict[str, int | float] | None:

return self.data["products"].get(product, None)

class Ui:

"""UI interaction class"""

def __init__(self) -> None:

self.business_logic = BusinessLogic()

def get_product_list(self) -> None:

print("PRODUCT LIST:")

for product in self.business_logic.product_list():

print(product)

print("")

def get_product_information(self, product: str) -> None:

product_info = self.business_logic.product_information(product)

if product_info:

print("PRODUCT INFORMATION:")

print(

f"Name: {product.title()}, "

+ f"Price: {product_info.get('price', 0):.2f}, "

+ f"Quantity: {product_info.get('quantity', 0):}"

)

else:

print(f"That product '{product}' does not exist in the records")

def main():

"""

>>> ui = Ui()

>>> ui.get_product_list()

PRODUCT LIST:

(Fetching from Data Store)

milk

eggs

cheese

<BLANKLINE>

>>> ui.get_product_information("cheese")

(Fetching from Data Store)

PRODUCT INFORMATION:

Name: Cheese, Price: 2.00, Quantity: 10

>>> ui.get_product_information("eggs")

(Fetching from Data Store)

PRODUCT INFORMATION:

Name: Eggs, Price: 0.20, Quantity: 100

>>> ui.get_product_information("milk")

(Fetching from Data Store)

PRODUCT INFORMATION:

Name: Milk, Price: 1.50, Quantity: 10

>>> ui.get_product_information("arepas")

(Fetching from Data Store)

That product 'arepas' does not exist in the records

"""

if __name__ == "__main__":

import doctest

doctest.testmod()