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Python Program to Print Fibonacci Series: A Comprehensive Guide

Table of Contents

The Fibonacci sequence is a series of numbers where each number is the sum of the two preceding ones, typically starting with 0 and 1. In Python, creating a program to print this series is a fundamental exercise that helps beginners understand concepts like loops and conditionals.

Understanding the Logic

Before we dive into the code, let’s understand the logic behind the Fibonacci series:

  • The series starts with 0 and 1.
  • Every subsequent number is the sum of the previous two numbers.

Step 1: Setting Up the Program

To start, we initialize the first two numbers of the series. In Python, this can be done using simple variable assignments:

num1, num2 = 0, 1

Step 2: Deciding the Series Length

The user should be able to determine how many numbers of the series they want to see. We can achieve this by asking for user input:

n_terms = int(input("How many terms? "))

Input Validation

It’s good practice to validate user input. For instance, the number of terms should be a positive integer.


if n_terms <= 0:
   print("Please enter a positive integer")

Step 3: Generating the Fibonacci Series

Now, we use a loop to calculate the series. A while loop works well for this purpose:

count = 0
while count < n_terms:
   print(num1)
   nth = num1 + num2
   # update values
   num1 = num2
   num2 = nth
   count += 1

Using For Loop

Alternatively, a for loop can be used:

for i in range(n_terms):
   print(num1)
   num1, num2 = num2, num1 + num2

Conclusion: Understanding and Flexibility

In conclusion, this Python program demonstrates basic concepts such as loops and conditionals. It’s also a flexible script that can be modified to explore more advanced Python features

Anand Das

Anand Das

Anand is Co-founder and CTO of Bito. He leads technical strategy and engineering, and is our biggest user! Formerly, Anand was CTO of Eyeota, a data company acquired by Dun & Bradstreet. He is co-founder of PubMatic, where he led the building of an ad exchange system that handles over 1 Trillion bids per day.

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