Why does my python Fibonacci Sequence algorithm not run properly?

Question

Write a program that prints the Fibonacci Sequence from the 5th till the 15th element of the sequence. How should i start from the 5th one, which is '3'? here is my code

def fibonacci_nums(n):
    if n <= 0:
        return [0]
    sequence = [0, 1]
    while len(sequence) <= n:
        next_value = sequence[len(sequence) - 1] + sequence[len(sequence) - 2]
        sequence.append(next_value)
      

return sequence

print("First 15 Fibonacci numbers:")
print(fibonacci_nums(15))

How about choosing a different start sequence? sequence = [2, 3] — Ashok Arora
– Ashok Arora, Commented Sep 28, 2021 at 11:48
The 5th element of the Fibonacci sequence is not 3, and especially not '3'. — Klaus D.
– Klaus D., Commented Sep 28, 2021 at 11:49
@KlausD. That depends on whether you consider fib(0)=0 or fib(0)=1 this is not a straight forward assumption by a long shot, and if you have a particularly strong opinion on that it probably belongs here: stackoverflow.com/questions/1451170/… — j__carlson
– j__carlson, Commented Sep 28, 2021 at 12:13
@j__carlson While you can modify it and theorize about the Fibonacci sequence, I think it would never have made it into any math book if this example for natural growth start with 0 rabbit pairs. — Klaus D.
– Klaus D., Commented Sep 28, 2021 at 12:27

Jellyfish · Accepted Answer · 2021-09-28 11:59:28Z

1

def fibonacci_nums(n):
  if n <= 0:
    return [0]
  sequence = [0, 1]
  while len(sequence) <= n:
    next_value = sequence[len(sequence) - 1] + sequence[len(sequence) - 2]
    sequence.append(next_value)
  return sequence[4:]
print("Fibonacci numbers from 5th to 15th number:")
print(fibonacci_nums(14))

answered Sep 28, 2021 at 11:59

Jellyfish

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Bhagyesh Dudhediya · Accepted Answer · 2021-09-28 11:59:31Z

1

Is this what you need:

def fibonacci_nums(n):
  if n <= 0:
    return [0]
  sequence = [0, 1]
  while len(sequence) <= n:
    next_value = sequence[len(sequence) - 1] + sequence[len(sequence) - 2]
    sequence.append(next_value)
  return sequence
print("First 15 Fibonacci numbers:")
print(fibonacci_nums(15)[4:])    # Print elements from 4th index

Output:

First 15 Fibonacci numbers:
[3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610]

answered Sep 28, 2021 at 11:59

Bhagyesh Dudhediya

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j__carlson · Accepted Answer · 2021-09-28 12:00:19Z

1

Try this:

def fibonacci_nums(n, k):
    fib=[0,1]
    for f in range(k-1):
        fib.append(fib[f]+fib[f+1])
    return fib[n-1:k]

fibonacci_nums(5, 15)

Output:

[3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377]

answered Sep 28, 2021 at 12:00

j__carlson

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