Why there's "None" at the end of result ?

Question

1. I have defined a fonction as bellow:

def joe_sum(x,y):
return print("result is: "+str(x+y))

2. And I run it:

print(joe_sum(1,2))

3. I get result:

result is: 3
None

4. My question: Why there's a "None" at the end of result ?

Answer 1

Because print() doesn't return anything at section 1.

def joe_sum(x,y):
return "result is: "+str(x+y)