Finding sum of values generated from a for loop in Python

Question

Hi totally new and struggling with a likely simple prob.
I have a for-loop creating values and printing the running total as they're generated. I need to find a way to print the sum of those running totals (in the case below: 3 + 33 + 333) I have a feeling a nested loop is an option but not sure where it'd go. Am I close? (Thanks)

Here is my code thus far:

def nSum(num):
    #calculating values for the variable (num) to the p power:
    p = 0
    newValue = 0
    for i in range(num):
        currentVal = num * 10**p
        p = p+1
    #running total of the curent values:
        newValue = currentVal + newValue
        print(newValue)
    return newValue

print(nSum(3)) #Want nSum to be total of all the newValues from the loop

jedwards · Accepted Answer · 2018-06-15 13:48:19Z

If you want to keep track of the intermediate values:

def nSum(num):
    #calculating values for the variable (num) to the p power:
    values = []
    for p in range(num):
        currentVal = num * 10**p
        #running total of the curent values:
        newValue = currentVal + (values[-1] if values else 0)
        values.append(newValue)

    return values

print(sum(nSum(3))) #Want nSum to be total of all the newValues from the loop

If you don't care about them, you can drop the list and just use an accumulator:

def nSum(num):
    #calculating values for the variable (num) to the p power:
    total = 0
    new_value = 0
    for p in range(num):
        currentVal = num * 10**p
        #running total of the curent values:
        new_value += currentVal
        total += new_value

    return total

print(nSum(3))

P.S. You don't need to define and increment p -- you can just use your (currently unused) variable i -- which is incremented automatically by range.

Taohidul Islam · Accepted Answer · 2018-06-15 14:16:02Z

-2

Do you want this?

def nSum(num):
    #calculating values for the variable (num) to the p power:
    p = 0
    newValue = 0 
    total_value=0 #new variable
    for i in range(num):
        currentVal = num * 10**p
        p = p+1
    #running total of the curent values:
        newValue = currentVal + newValue
        print(newValue)
        total_value+=newValue #new line
    return total_value

print(nSum(3)) #Want nSum to be total of all the newValues from the loop

Or you can do it without using p variable.You can do it only using i variable.Like :

def nSum(num):
    #calculating values for the variable (num) to the p power:
    newValue = 0
    total_value=0
    for i in range(num):
        currentVal = num * 10**i
    #running total of the curent values:
        newValue = currentVal + newValue
        print(newValue)
        total_value+=newValue
    return total_value

print(nSum(3)) #Want nSum to be total of all the newValues from the loop

edited Jun 15, 2018 at 14:16

answered Jun 15, 2018 at 13:43

Taohidul Islam

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5 Comments

FHTMitchell Over a year ago

huh? Why are you using p = 0, p += 1? Just use i.

Taohidul Islam Over a year ago

I know this, but i tried to make my answer as same as question. It will be more helpful for him to get my answer.

Taohidul Islam Over a year ago

@FHTMitchell I have updated my answer as you suggested. Thanks

jedwards Over a year ago

Did you really edit your answer to mirror mine? What's the point?

Taohidul Islam Over a year ago

We have answered almost at the same time. And then I have updated my answer as FHTMitchell suggested. That's it. The idea was same, may be that's why there is similarity between our answers.

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