How does the functions in python works when we call them that is please explain me the following working of generating outputs

Question

def add (x,y, z):
Print (x+y+z)
def prod (x,y,z):
return x*y*z
a=add (6,16,26)
b=prod (2,3,6)
print (a,b)

Output: None 36

def change (p,q=30):
p=p+q
q=p-q
print(p,"#",q)
return(p)
r=150
s=100
r=change(r,s)
print(r,"#",s)
s= change(s)

Output:
150#50
150#100
100#70

I want to ask that in both above codes variables are are containing the function call but in 1st one the "add" function does not print any thing while function have print there

while in 2nd the fiunction call is still assigned to a variable but still printing a value

how does these two outputs are coming please explain

Is this is because of return if yes then how

Answer 1

Sandra Meyer this is a question of my school book
in the first case i thought of the same output as generated by your code but in book it is written like that

Answer 2

Though it is not explicitly defined in Python, each method has a return value. Returning nothing is the so called 'void'. Your method add does not return anything, it is just printing something. You in fact assign 'void' to 'a' - which results in "Undefined"-output. Your method prod has a return value, that's why b can be printed correctly.

https://code.sololearn.com/cL00hyx59xat/?ref=app

Answer 3

Take a look at the project I posted, it's explained there very clear and everything works as expected.