The difference between print and return when returning a value from a function

Question

I pass the python codeacademy tutorial. task - to write a function that adds up the digits of a number and returns the result of the addition. my code is:

def digit_sum(n): n = str(n) summ = 0 for i in n: summ += int(i) print summ digit_sum(234)

Result: 9, but an error pops up, saying that I have to return ( return ) the amount.

I change the code:

 def digit_sum(n): n = str(n) summ = 0 for i in n: summ += int(i) return summ digit_sum(234) print summ

a message appears that the task is executed correctly, but the result is for some reason 15 ... at what, the result is 15 no matter what function argument I asked (whether 234, 32145 or 111) I can not understand what the problem is ...

Alexander Loev Alexander Loev 239 one five · Accepted Answer · 2017-01-24T10:51:28

You do not store the value that digit_sum(234) returns

At the end you need to write:

 print digit_sum(234)

Or:

 a = digit_sum(234) print a

The variable summ is a local variable of the function digit_sum(n) and cannot be accessed from outside in this way.

I think 15 is some kind of internal interpreter variable on the codeacademy, if you execute this code in the system, you get NameError: name 'summ' is not defined

The difference between print and return when returning a value from a function

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