Can anyone please explain this line of code in Python ?

Question

user_number = int(input("enter a number: "))
def fibbonacci(num):
if num == 0 or num == 1:
return num
else:
return fibbonacci(num - 2) + fibbonacci(num - 1) # can someone explain how this line working after second iteration

for num in range(user_number + 1):
print(fibbonacci(num))

#Thank You so much

Answer 1

Do you know what is the fibonacci series?