This is a generator, not a simple function. For 48th number in sequence or greater, code would require a Long data type rather than an Integer. I believe this is the best (or nearly the best) solution: def fibo(n): The Fibonacci sequence is a sequence F n of natural numbers defined recursively: F 0 0 F 1. Better method of generating Fibonacci numbers The solution is to convert result of raw_input() into int like that: d = int(raw_input("How many numbers would you like to display"))Īnd everything will work unless you provide non-integer.īut there is better (shorter, more efficient, more encapsulated) method of generating Fibonacci numbers (see below). But range() expects expects integers, not strings, and Python does not convert it automatically (it leaves conversion to you). You assign string from the input into the d variable, and later you pass it to range(). The problem here is that here: d = raw_input("How many numbers would you like to display") # A sorter alternative for this three lines would be: Print b # but I think several prints look better in this particular case.įor d in range(numbers - 2): # you already printed 2 numbers, now print 2 less Python Program to Print the Fibonacci Sequence - Coding Ninjas 404 - Thats an error. Print a # you can write this as print "%i\n%i" % (a, b) Your code is summing the even numbers from the first four million Fibonacci numbers which is vastly different. t2 is the second term in the list and n is the number of terms in the list. sum of the even numbers of the numbers below 4,000,000 in the Fibonacci sequence. In this program, youll learn to print the Fibonacci sequence using while loop. For example, the first 6 terms in the Fibonacci sequence are 1, 1, 2, 3, 5, 8. As a reminder, the Fibonacci sequence is defined such that each number is the sum of the two previous numbers. Section 1: Introduction of Recursion and Dynamic Programming 1.1 Background. # Note the number you enter should be > 2: you print 0,1 by default I want to create a function that makes a so called super Fibonacci sequence which is a list of numbers, that from the third term onwards, every term is the sum of all the previous terms. If you are unfamiliar with recursion, check out this article: Recursion in Python. Fibonacci Number as our example to illustrate the coding logic and complexity of recursion vs dynamic programming with Python. # In a robust program you should use try/except to catch wrong entries # as above as `range(int(numbers))` or in `int(raw_input())` # I personnally prefer this here, although you could put it Numbers = raw_input("How many numbers would you like to display > ") Try this way for example: numbers = raw_input("How many numbers would you like to display")Įdit: I complete below the answer with additional code tuning (thanks to commenters): # one space will separate better visually question and entry in console It works but it is awful, unpythonic, whatever. One more thing: Do not use for d in range(d). So convert d to an integer with: d = int(d)
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