# Category: Fibonacci sequence python generator

This article features a Python Program to generate the Fibonacci series using the if-else statement and while loop upto n number of terms. The Fibonacci series is a sequence in which each number is the sum of the previous two numbers.

The few terms of the simplest Fibonacci series are 1, 1, 2, 3, 5, 8, 13 and so on. The nth number of the Fibonacci series is called Fibonacci Number and it is often denoted by F n. For example, the 6th Fibonacci Number i. The logic behind this sequence is quite easy. Each new item of series can easily be generated by simply adding the previous two terms.

But before we can do so, we must store the previous two terms always while moving on further to generate the next numbers in the series. There are different logics and approaches that can be used to generate the Fibonacci series in python. The following program is the simplest way that makes use of the if-else statement in association with the while loop.

After the program runs, it asked for the number of terms required in the series and I entered 10 and hence it generated the Fibonacci Series involving the first 10 terms. Note that 0 is also included in this series. You may or may not consider 0 as the first number of your Fibonacci Series and accordingly you might need to slightly modify the code but the logic will remain the same. I hope you found this guide useful. If so, do share it with others who are willing to learn Python.

Ask for number of terms the user wanted in the generated series. Defining the First Two Terms. Count Variable. Logic to check if the user enetered a positive Integer. In case user enters 1, print only the first term. Updating Values For Next Iteration. Increasing the Count Value by 1.

Subscribe To WTMatter! Receive updates of our latest articles via email. Enter your email address below to get started. Python datetime Tutorial with Examples.Join Stack Overflow to learn, share knowledge, and build your career. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I need to make a program that asks for the amount of Fibonacci numbers printed and then prints them like 0, 1, 1, My code looks the following:.

You won't run into the problem as often if you give your variables more descriptive names 3 different uses of the name a in 10 lines of code! Python is a dynamically typed language. Here at first, you have declared a to hold an integer type and later you have assigned a function to it and so its type now became a function.

Whenever Python sees an ait thinks you are talking about the above one. Calling it something else elsewhere or here should help. You had the right idea and a very elegant solution, all you need to do fix is your swapping and adding statement of a and b.

Your yield statement should go after your swap as well. It looks like you are using the a twice.

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Try changing that to a different variable name. Learn more. Python Fibonacci Generator Ask Question. Asked 10 years, 3 months ago. Active 1 year ago. Viewed 68k times. Improve this question. Mehrdad Pedramfar 9, 3 3 gold badges 29 29 silver badges 53 53 bronze badges. John John 1 1 gold badge 2 2 silver badges 3 3 bronze badges. Technically speaking Python can do some optimization, but I'm ignoring this for now.

Active Oldest Votes. Improve this answer. Am I missing something? Since you are writing a generator, why not use two yields, to save doing the extra shuffle? Gaurav Kumar 10 10 silver badges 18 18 bronze badges. I found it for Python 3, it is b.

Alex Alex 31 1 1 bronze badge. Your a is a global name so-to-say. Jungle Hunter Jungle Hunter 6, 8 8 gold badges 38 38 silver badges 66 66 bronze badges. Tony Veijalainen Tony Veijalainen 4, 19 19 silver badges 30 30 bronze badges. Patrick Krecker Patrick Krecker 8 8 bronze badges. Jeremy Jeremy 23 7 7 bronze badges. Kuldeep Choughule Kuldeep Choughule 31 2 2 bronze badges.Join Stack Overflow to learn, share knowledge, and build your career. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

One more thing: Do not use for d in range d. It works but it is awful, unpythonic, whatever. Try this way for example:. Edit : I complete below the answer with additional code tuning thanks to commenters :. But range expects expects integers, not strings, and Python does not convert it automatically it leaves conversion to you.

But there is better shorter, more efficient, more encapsulated method of generating Fibonacci numbers see below. This is a generator, not a simple function. It is very efficient, its code is short and does not print anything, but you can print its result like that:. I see many over complicated Fibonacci Sequence programs so I just did this with a while loop; changing the number after the while loop. Learn more. Creating fibonacci sequence generator Beginner Python Ask Question.

Asked 9 years ago. Active 17 days ago.

Sum of Fibonacci Numbers Trick

Viewed 15k times. Hi I'm trying to create a Fibonacci sequence generator in Python. Improve this question. Active Oldest Votes. Improve this answer. Tadeck the ; syntax that ChadMiller used is perfectly valid python. It is just not typical or desirable most of the time. Tadeck Tadeck k 22 22 gold badges silver badges bronze badges. For the most general solution you could remove xrange from fibo function and use itertools. I am not sure however, how this solution may be more general, could you explain? Also what do you think about this: ideone.

More general means it is applicable in a wider context e. The more general the solution at the more global scope it could be defined therefore it doesn't make sense to put a fib inside fibo.In this Python program, you will learn how to generate and print Fibonacci series using loops and conditional statements. A Fibonacci sequence is an sequence of integers where the value of the sequence is determined by adding the preceding two values.

The first two values in the sequence is 0 and 1. In the above program, we store the number of Fibonacci sequence to be generated in the variable No and the first two terms are initialized with 0 and 1 in the variables num1 and num2 respectively. When the number of sequence to be generated is more than 2a while loop is used to find the next term in the sequence by adding the previous two sequence variables. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. C Program to display half-pyramid using alphabets How to check if the number is positive or negative in C?The simplest is the series 1, 1, 2, 3, 5, 8, etc. That has saved us all a lot of trouble!

## Python Program to Print the Fibonacci sequence

Thank you, Leonardo. So next Nov 23 let everyone know! This approach is based on the following algorithm 1.

Declare two variables representing two terms of the series. Initialize them to 0 and 1 as the first and second terms of the series respectively. Initialize a variable representing loop counter to 0. Loop from 0 to the total number of terms in the series. In every iteration, A. This represents a term or item of the Fibonacci series.

So Python program to generate Fibonacci series written as per the above algorithm follows. Create a recursive function which receives an integer as an argument.

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Thus, if it receives 5, it returns the value at 5th position in Fibonacci series. This recursive function returns 0 and 1 if the argument value is 0 or 1. For all other values, it calls itself with the sum of nth and n-1 th positions. The program reads the total number of elements in Fibonacci series from the keyboard. It then initiates a loop starting from 0 till this input value. In every iteration, the recursive function is called and the resultant Fibonacci item for that position is printed.

You can change the num1, num2, and series to 1 if you want the series to be started without 0. The complete code for this would be —. Similarly, if you wish to start Fibonacci from any point, you can use the same method.

Contents of Tutorial. Share this: Twitter Facebook. Notify of. Oldest Newest Most Voted. Inline Feedbacks. Or you can do this…. Python Pool.You need to implement a Python 2. Python 2. As shown in this recipe, it is easy to create a generator that produces the Fibonacci sequence.

In Python 2.

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A generator is a function containing the keyword yield. When you call a generator, the function body does not execute. When you call next again on the same iterator object, execution of the function body continues from where it left off, again up to the next yield statement to execute.

If the function body falls off the end or executes a return statement, the iterator object raises a StopIteration to indicate the end of the sequence.

But, of course, if the sequence that the generator is producing is not bounded, the iterator will never raise a StopIteration. The third problem in his Liber Abaci, which he originally expressed in terms of a rabbit-raising farm, still provides interesting applications for the distant successors of the abacus, modern computers. 