CODEWITHSUNDEEP
pythonfunction
Liondancer
Liondancer

Reputation: 16479

How to pass multiple values of different types to different functions

I'm new to python so I'm trying to practice by making a simple macro-nutrient calculator. I'm not quite sure how to pass certain values to different functions.

Here is my code

def Macro_input():
    Percent_protein = input("Percentage of Protein: ") 
    float(Percent_protein)
    Percent_carb = input("Percentage of Carbohydrates: ")
    float(Percent_carb)
    Percent_fat = input("Percentage of Fats: ")
    float(Percent_fat)
    Macro_dict = {'Protein': Percent_protein, 'Carbohydrate': Percent_carb, 'Fats': Percent_fat}
    Macro_sum = Percent_protein + Percent_carb + Percent_fat
    return Macro_sum 

def Total_macro_check(Macro_sum):

    #perhaps put all input into a dictionary? Macro['Protein':num, 'Carb':num, 'Fat':num]

    if Macro_sum == 100:
        print "You macronutrients percentages are \n Protein: "#, Macro_dict['Protein'], "%"    #list for P/C/F --> %d
    elif Macro_sum < 100:
        print "Total percentages do not add up to 100. Please reenter percentages."
    #go back to function that asks for Macros
    elif Macro_sum > 100:
        print "Total percentages surpass 100. Please reenter percentages."
    #go back to function that asks for Macros

def main():
    print "Please enter your macro-nutrients"
    Total_macro_value = Macro_input()

    Total_macro_check(Total_macro_value)

if __name__ == "__main__":
    main()

What I want to do is output a Dictionary (Macro_dict),
So I can print it out if the sum of all macros (Macro_sum) is 100.
But I also want to check if Macro_sum equals 100.
This means I have to output a value Macro_sum into the function Total_macro_check.

However I feel as though if my Macro_input function returned Macro_sum and Macro_dict,
I cannot use its output in Total_macro_check due to it returning more than one value, while Total_macro_check only accepts 1 value.

Upvotes: 0

Views: 137

Answers (3)

James
James

Reputation: 4374

Your function Macro_Input is bogey. I don't think this line behave as you think it does.

float(Percent_protein)

This is casting Percent_protein to float yes, but it's not assigning that value to anything.

Your func should be.

def Macro_input():
    Percent_protein = float(input("Percentage of Protein: "))
    Percent_carb = float(input("Percentage of Carbohydrates: "))
    Percent_fat = float(input("Percentage of Fats: "))
    Macro_dict = {'Protein': Percent_protein, 'Carbohydrate': Percent_carb, 'Fats': Percent_fat}
    Macro_sum = Percent_protein + Percent_carb + Percent_fat
    return (Macro_dict,Macro_sum)

Now it will return the dictionary and sum as you want. You can get them out with.

(dict,sum) = Macro_input()

Upvotes: 4

Aaron Digulla
Aaron Digulla

Reputation: 328770

Create a class to contain the values plus helper functions:

class MacroInput(object):
    def __init__(self, protein, carb, fat):
        self.protein, self.carb, self.fat = protein, carb, fat

    def sum(self):
        return self.protein + self.carb + self.fat

You can create an instance of this in Macro_input() and then pass that instance around. def Total_macro_check(Macro_sum) would then become:

def Total_macro_check(input):
    sum = input.sum()
    if sum == 100:
        print "You macronutrients percentages are \n Protein:", input.protein, "%"    #list for P/C/F --> %d
    ...

Upvotes: 1

samfrances
samfrances

Reputation: 3695

Modify Macro_input() to return a tuple of Macro_dict and Macro_sum

def Macro_input():
    # your code
    return Macro_sum, Macro_dict

Then you in your main function you can unpack the returned tuple into two variables like this:

def main():
    print "Please enter your macro-nutrients"
    Total_macro_value, Macro_dict = Macro_input()

    Total_macro_check(Total_macro_value)

Upvotes: 2

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