please help me to how to work this code

Question

def sum(x,y):
if(y==0):
return x;
else:
return(1+sum(x,y-1));
x=10
y=20
print("Sum of two numbers are: ",sum(x,y))

Answer 1

What is it supposed to do?

If you want to just add 2 numbers what are you trying to achieve with the recursion?

Answer 2

I went add two number with recursion

Answer 3

Did you run the code? What problem do you get?

Answer 4

it's run properly

Answer 5

This code recursed Y into series of 1, after finish, just add the series to X.