[Python] why isn't 10 printed instead of None although I stored the value of add_one function...

num = 0

def add_one(num):
if(num>=9):
return num+1
total=num+1
print(total)
add_one(total)

new_total = add_one(0)
print(new_total)


I expected it to print 10 instead of None. I don't know why. Could you please help me understand why this happened?

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