Calculate values in a dictionary-CodePudding

I have following dictionary:

food_calories = {"Burger": 400, "Ice Cream": 350, "Cake": 640, "Chicken": 400, "Rice": 250, "Salad": 40, "Fanta": 170, "Coke": 200, "Beef": 350}

How can I calculate the sum of some values of the dictionary? E.g. Ice Cream", "Chicken", "Beef") #=> 1100

I only get errors and I'm stuck in setting up the function.

min_calories = min(zip(food_calories.values(), food_calories.keys()))
max_calories = max(zip(food_calories.values(), food_calories.keys()))
print("min_calories:",min_calories)
print("max_calories:",max_calories)

values = food_calories.values()
total = sum(values)
print(total)

def food_calories_sum():
  for k in food_calories:
    return k

CodePudding user response：

Is this what you are looking for?

l = ["Ice Cream", "Chicken", "Beef"]

def food_calories_sum(l):
    return sum([food_calories.get(i,0) for i in l])

food_calories_sum(l)

You can replace the food_calories.get(i,0) with food_calories[i] but if you pass an item that doesn't exist in the food_calories dictionary it will throw an error.

Instead, food_calories.get(i,0) returns 0 as default value if key is not found, therefore only returning sum for items that exist and doing some exception handling.

CodePudding user response：

You can access the value of each key by using this syntax: food_calories['item'], where item is some key in your dictionary.

This is a sample output where food_calories is the dict you defined in your post:

>>> food_calories['Rice']   food_calories['Burger']
650