Add Ch. 12 problem

2_intermediate/chapter12/practice/food_class.py

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+"""
+Food
+
+Create a Food class with 4 instance
+attributes: name. calories, grams of
+protein, and grams of fat.
+
+It should have 2 methods: an eat method
+that prints "You are eating " and the name
+of the food, and a burn method that prints
+"You burned [x] calories." where [x] is
+the number of calories in the food.
+
+Create a JunkFood subclass and a Meal
+subclass. Both subclasses should carry
+over the attributes and methods of the
+Food class.
+The JunkFood subclass should have an
+additional attribute for the grams of
+sugar contained in the food, and the Meal
+subclass should have an additional attribute
+for the mg of sodium it contains.
+
+Create a list called snacks and fill it with at
+least 3 junk foods, and create a list called
+meals and fill it with at least 3 meals.
+Then, use Python to show that you ate all the
+foods in both lists, and burned off one meal
+(pick this meal randomly).
+Display the total number of calories,
+grams of protein, grams of fat, grams of
+sugar, and mg of sodium that you ate (the total
+for all the foods in both lists).
+"""

2_intermediate/chapter12/solutions/food_class.py

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+"""
+Food
+
+Create a Food class with 4 instance
+attributes: name. calories, grams of
+protein, and grams of fat.
+
+It should have 2 methods: an eat method
+that prints "You are eating " and the name
+of the food, and a burn method that prints
+"You burned [x] calories." where [x] is
+the number of calories in the food.
+
+Create a JunkFood subclass and a Meal
+subclass. Both subclasses should carry
+over the attributes and methods of the
+Food class.
+The JunkFood subclass should have an
+additional attribute for the grams of
+sugar contained in the food, and the Meal
+subclass should have an additional attribute
+for the mg of sodium it contains.
+
+Create a list called snacks and fill it with at
+least 3 junk foods, and create a list called
+meals and fill it with at least 3 meals.
+Then, use Python to show that you ate all the
+foods in both lists, and burned off one meal
+(pick this meal randomly).
+Display the total number of calories,
+grams of protein, grams of fat, grams of
+sugar, and mg of sodium that you ate (the total
+for all the foods in both lists).
+"""
+import random
+
+
+class Food:
+    def __init__(self, name, cals, protein, fat):
+        self.name = name
+        self.cals = cals
+        self.protein = protein
+        self.fat = fat
+
+    def eat(self):
+        print("You are eating " + self.name + ".")
+
+    def burn(self):
+        print("You burned %d calories." % self.cals)
+
+
+class JunkFood(Food):
+    def __init__(self, name, cals, protein, fat, sugar):
+        super().__init__(name, cals, protein, fat)
+        self.sugar = sugar
+
+
+class Meal(Food):
+    def __init__(self, name, cals, protein, fat, sodium):
+        Food.__init__(self, name, cals, protein, fat)
+        self.sodium = sodium
+
+
+snacks = [
+    JunkFood("Oreo", 55, 0.5, 2.2, 4.1),
+    JunkFood("Brownie", 70, 2, 3, 2),
+    JunkFood("Chips", 160, 2, 10, 0),
+]
+
+meals = [
+    Meal("Rice and beans", 400, 10, 5, 15),
+    Meal("Burrito", 350, 8, 9, 100),
+    Meal("Pizza", 500, 20, 15, 150),
+]
+
+cals, protein, fat, sugar, sodium = 0, 0, 0, 0, 0
+
+for snack in snacks:
+    snack.eat()
+    cals += snack.cals
+    protein += snack.protein
+    fat += snack.fat
+    sugar += snack.sugar
+
+for meal in meals:
+    meal.eat()
+    cals += meal.cals
+    protein += meal.protein
+    fat += meal.fat
+    sodium += meal.sodium
+
+# Choose a random meal to burn off.
+meals[random.randrange(len(meals))].burn()
+
+# Display totals
+print("Totals eaten:")
+print("Calories:", cals)
+print("Protein (g):", protein)
+print("Fat (g):", fat)
+print("Sugar (g):", sugar)
+print("Sodium (mg):", sodium)