Solution

app/car.py

@@ -0,0 +1,23 @@
+from math import sqrt
+
+
+class Car:
+    def __init__(
+            self,
+            brand: str,
+            fuel_consumption: float
+    ) -> None:
+        self.brand = brand
+        self.fuel_consumption = fuel_consumption
+
+    def liters_needed(
+            self,
+            customer_location: list,
+            shop_location: list
+    ) -> float:
+        distance_to_shop = (sqrt(
+            (shop_location[0] - customer_location[0]) ** 2
+            + (shop_location[1] - customer_location[1]) ** 2)
+            * 2)
+        liters_needed = self.fuel_consumption / 100 * distance_to_shop
+        return liters_needed

app/customer.py

@@ -0,0 +1,25 @@
+class Customer:
+    def __init__(
+            self,
+            name: str,
+            products: dict,
+            location: list,
+            money: int
+    ) -> None:
+        self.name = name
+        self.products = products
+        self.location = location
+        self.money = money
+
+    def money_amount(self) -> str:
+        return f"{self.name} has {self.money} dollars\n"
+
+    def cost_of_products_in_shop(self, shop: dict) -> float:
+        total_for_shop = 0
+        for product in self.products:
+            cost_of_product = self.products[product] * shop[product]
+            total_for_shop += cost_of_product
+        return total_for_shop
+
+    def change_location(self, shop_location: list) -> None:
+        self.location = shop_location

app/main.py

@@ -1,3 +1,73 @@
-def shop_trip():
-    # write your code here
-    pass
+import os
+import json
+
+from app.customer import Customer
+from app.shop import Shop
+from app.car import Car
+
+
+def shop_trip() -> None:
+
+    with open(os.getcwd() + "/app/config.json", "r") as file:
+        info = json.load(file)
+
+    buyers = info["customers"]
+    stores = info["shops"]
+    fuel_price = info["FUEL_PRICE"]
+    out = """"""
+    for buyer in buyers:
+        customer = Customer(
+            buyer["name"],
+            buyer["product_cart"],
+            buyer["location"],
+            buyer["money"]
+        )
+        car = Car(
+            brand=buyer["car"]["brand"],
+            fuel_consumption=buyer["car"]["fuel_consumption"]
+        )
+        out += customer.money_amount()
+        cost_in_all_shops = {}
+        for store in stores:
+            shop = Shop(
+                store["name"],
+                store["location"],
+                store["products"]
+            )
+            cost_in_one_shop = (
+                customer.cost_of_products_in_shop(shop.shop_products)
+            )
+            cost_of_fuel = (
+                car.liters_needed(customer.location, shop.shop_location)
+                * fuel_price
+            )
+            sum_shop_and_fuel_cost = round(cost_in_one_shop + cost_of_fuel, 2)
+            out += (f"{customer.name}'s trip to the {shop.shop_name} "
+                    f"costs {sum_shop_and_fuel_cost}\n")
+            cost_in_all_shops[shop.shop_name] = sum_shop_and_fuel_cost
+        min_cost_key = min(
+            cost_in_all_shops, key=lambda k: cost_in_all_shops[k]
+        )
+        if customer.money > cost_in_all_shops[min_cost_key]:
+            out += f"{customer.name} rides to {min_cost_key}\n\n"
+            index_of_the_right_shop = 0
+            for index, store in enumerate(stores):
+                if store["name"] == min_cost_key:
+                    index_of_the_right_shop = index
+
+            min_bill_shop = Shop(
+                shop_name=stores[index_of_the_right_shop]["name"],
+                shop_location=stores[index_of_the_right_shop]["location"],
+                shop_products=stores[index_of_the_right_shop]["products"]
+            )
+            out += min_bill_shop.bill(customer.name, customer.products)
+            customer.change_location(min_bill_shop.shop_location)
+            amount_left = customer.money - cost_in_all_shops[min_cost_key]
+            out += "\n"
+            out += f"{customer.name} rides home\n"
+            out += f"{customer.name} now has {amount_left} dollars\n\n"
+
+        else:
+            out += (f"{customer.name} doesn't have enough money "
+                    f"to make a purchase in any shop")
+    print(out)

app/shop.py

@@ -0,0 +1,35 @@
+import datetime
+
+
+class Shop:
+    def __init__(
+            self,
+            shop_name: str,
+            shop_location: list,
+            shop_products: dict
+    ) -> None:
+        self.shop_name = shop_name
+        self.shop_location = shop_location
+        self.shop_products = shop_products
+
+    def bill(self, customer_name: str, products_needed: dict) -> str:
+        out = """"""
+        out += (f"Date: "
+                f"{datetime.datetime.now().strftime('%d/%m/%Y %H:%M:%S')}"
+                f"\n")
+        out += f"Thanks, {customer_name}, for your purchase!\n"
+        out += "You have bought:\n"
+        total_amount = 0
+        for product in self.shop_products:
+            total_for_product = (
+                products_needed[product]
+                * self.shop_products[product]
+            )
+            total_amount += total_for_product
+            if str(total_for_product)[-2:] == ".0":
+                total_for_product = int(total_for_product)
+            out += (f"{products_needed[product]} {product}s "
+                    f"for {total_for_product} dollars\n")
+        out += f"Total cost is {total_amount} dollars\n"
+        out += "See you again!\n"
+        return out