To understand this example, you should have the knowledge of following Python programming topics:
A Fibonacci sequence is the integer sequence of 0, 1, 1, 2, 3, 5, 8....
The first two terms are 0 and 1. All other terms are obtained by adding the preceding two terms.This means to say the nth term is the sum of (n-1)th and (n-2)th term.
# Python program to display the Fibonacci sequence up to n-th term using recursive functions def recur_fibo(n): """Recursive function to print Fibonacci sequence""" if n <= 1: return n else: return(recur_fibo(n-1) + recur_fibo(n-2)) # Change this value for a different result nterms = 10 # uncomment to take input from the user #nterms = int(input("How many terms? ")) # check if the number of terms is valid if nterms <= 0: print("Plese enter a positive integer") else: print("Fibonacci sequence:") for i in range(nterms): print(recur_fibo(i))
Fibonacci sequence: 0 1 1 2 3 5 8 13 21 34
Note: To test the program, change the value of nterms.
In this program, we store the number of terms to be displayed in nterms.
A recursive function
recur_fibo() is used to calculate the nth term of the sequence. We use a
for loop to iterate and calculate each term recursively.
Visit here to know more about recursion in Python.