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How to Calculate Fibonacci using Recursive Function and Iterative Method in Python

Here is how to Calculate Fibonacci using Recursive Function and Iterative Method in Python. Recursive method here is very expensive in terms of processing. For a larger number, it will hang the device.
Run the code here: https://repl.it/@VinitKhandelwal/fibonacci
# Recursive - O(2^n)
def fibonacciRecursive(n):
if n < 2:
return n
return fibonacciRecursive(n-1) + fibonacciRecursive(n-2)

# Iterative - O(n)
def fibonacciIterative(n):
result = 0
now = 1
for i in range(1, n+1):
prev = now
now = result
result = prev + now
return result

print(fibonacciRecursive(8))
print(fibonacciIterative(8))

OUTPUT

21
21

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