Python Program to Find nth term of a Fibonacci Series

Program to find nth fibonacci number in python; In this tutorial, you will learn how to find nth term in fibonacci series in python using for loop, while loop and recursion function.

Python Program to Find nth term of a Fibonacci Series

• Fibonacci series in python using for loop
• Fibonacci series python programming using while loop
• Fibonacci series in python using recursion
• Sum of fibonacci series in python

Fibonacci series in python using for loop

# Take input from user
a=int(input("Enter the terms"))
f=0
s=1
if a<=0:
    print("The requested series is ",f)
else:
    print(f,s,end=" ")
    for x in range(2,a):
        next=f+s
        print(next,end=" ")
        f=s
        s=next

Output

Enter the terms 15
0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 

Fibonacci series python programming using while loop

# Python Fibonacci series Program using While Loop

# Fibonacci series will start at 0 and travel upto below number
Number = int(input("\nPlease Enter the Range Number: "))

# Initializing First and Second Values of a Series
i = 0
First_Value = 0
Second_Value = 1

# Find & Displaying Fibonacci series
while(i < Number):
           if(i <= 1):
                      Next = i
           else:
                      Next = First_Value + Second_Value
                      First_Value = Second_Value
                      Second_Value = Next
           print(Next)
           i = i + 1

Output

Please Enter the Range Number:  10
0
1
1
2
3
5
8
13
21
34

Fibonacci series in python using recursion

def FibRecursion(n):
   if n <= 1:
       return n
   else:
       return(FibRecursion(n-1) + FibRecursion(n-2))
nterms = int(input("Enter the terms? "))  # take input from the user

if nterms <= 0:  # check if the number is valid
   print("Please enter a positive integer")
else:
   print("Fibonacci sequence:")
   for i in range(nterms):
       print(FibRecursion(i))

Output

Enter the terms?  15
Fibonacci sequence:
0
1
1
2
3
5
8
13
21
34
55
89
144
233
377

Sum of fibonacci series in python

# Python to calculate sum of Fibonacci numbers


# Computes value of first
# fibonacci numbers
def calSum(n) :
    if (n <= 0) :
        return 0

    fibo =[0] * (n+1)
    fibo[1] = 1

    # Initialize result
    sm = fibo[0] + fibo[1]

    # Add remaining terms
    for i in range(2,n+1) :
        fibo[i] = fibo[i-1] + fibo[i-2]
        sm = sm + fibo[i]

    return sm


#take input from user
n=int(input("Enter the terms"))

#call calSum() function and print result
print("Sum of Fibonacci numbers is : " ,
      calSum(n)) 

Output

Enter the terms 10
Sum of Fibonacci numbers is :  143 

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