How can I get sum of two numbers?

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I have written a very simple code in python. I am thinking that it should return the sum of the two numbers but its giving output as "NONE". But why? Can anybody help me to understand that one.
BTW I know how I can add two numbers, but I am desirous to ask that why that code is not giving me required output

What I have tried:

Python

#Its simple python code to add two numbers
def ask(num1,num2):
    sum = num1 + num2

print(ask(4,5))

Posted 18-Aug-17 2:10am

Hassaan_Malik

Updated 18-Aug-17 2:54am

Patrice T

v2

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4 solutions

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Thomas Daniels · Accepted Answer · 2017-08-18T02:16:00

Solution 1

Your code performs a summation, but it never returns the value (i.e. it never gives back a value to the caller) - it's stored in the sum variable, but nothing else happens with it.

You need this instead:

Python

def ask(num1, num2):
    return num1 + num2

print(ask(4, 5))

Posted 18-Aug-17 2:16am

Thomas Daniels

Updated 18-Aug-17 2:17am

v2

Comments

Jochen Arndt 18-Aug-17 8:19am

+5
Now you beat me by exactly 0 seconds (it shows for both "Posted 22 secs ago").

Patrice T · Accepted Answer · 2017-08-18T02:25:00

Solution 3

This is Python 101 !

How do you think Python will guess that sum is the value you want to return as the answer of ask ?

May be you should follow a tutorial and learn how to return a value from a UDF. One can guess you will learn a lot of useful things.

Posted 18-Aug-17 2:25am

Patrice T

Richard MacCutchan · Accepted Answer · 2017-08-18T02:53:00

Solution 4

It is all clearly expalined in The Python Tutorial — Python 3.4.7rc1 documentation[^].

Posted 18-Aug-17 2:53am

Richard MacCutchan

Jochen Arndt · Accepted Answer · 2017-08-18T02:16:00

Solution 2

You have to return the result from your function using the return statement:

Python

def ask(num1,num2):
    sum = num1 + num2
    return sum

print(ask(4,5))

Posted 18-Aug-17 2:16am

Jochen Arndt