Python program to print Fibonacci Sequence

Summary:

Problem Statement: Write a Python program to print the Fibonacci sequence up to n terms.

Description: The Fibonacci sequence of numbers 0, 1, 1, 2, 3, 5, 8, 13, 21, 34 … formed by adding its previous two numbers.

It is defined by Fn = Fn-1+Fn-2.

Example:

Input: 7
Output: 0 1 1 2 3 5 8
Explanation: 0 and 1 are first two numbers in fibonacci sequence. Then next terms are calculated by 
0+1=1
1+1=2
1+2=3
2+3=5
3+5=8
.
.
.

Hint: Initialize two variables with initial Fibonacci sequence 0 and 1. Then use for loop to print and add them for the next sequence.

Now you have the logic, you should try to write a Python program to find and print Fibonacci sequence up to n terms.

Python Program: Find Fibonacci Sequence using loop

fibonacci.py

Copy

n =abs(int(input("How many fibonacci numbers you want: ")))
fib1 = 0
fib2 = 1
while(n>0):
    print(fib1)
    nextTerm = fib1+fib2
    fib1 = fib2
    fib2 = nextTerm
    n-=1

Output

How many fibonacci numbers you want: 5 0 1 1 2 3

At first, we take the input in string form and convert to integer followed by calculating absolute value using abs() function.

As described in the logic the first two Fibonacci numbers are 0 and 1.

Then we use while loop to print the Fibonacci number and find the next term using the formula.

While loop runs n times as entered by the user, printing n Fibonacci numbers.