viewed some other forums to see if I could find an answer to this but I didn’t find anything satisfactory. I’m writing a program to work out the fibonacci sequence up to a specified index, but I keep getting an error.

allNums = {1, 1}

while len(allNums) < 35:
    currentIndex = len(allNums)
    nextIndex = allNums[currentIndex - 1] + allNums[currentIndex - 2]
    allNums[currentIndex] = nextIndex
    print(nextIndex)

This is working fine on my laptop, but for some reason when I try it on my desktop it gives me the error:
nextIndex = allNums(currentIndex - 1) + allNums(currentIndex - 2)
TypeError: 'set' object is not callable

Any help?

>Solution :

Sets do not support calling allNums(currentIndex - 1) nor are subscriptable (i.e allow index assigning) allNums[currentIndex - 1]. There are designed for quick search of items, not storing them in order.

You need allNums to be a list, not a set:

allNums = [1, 1]

while len(allNums) < 35:
    currentIndex = len(allNums)
    nextIndex = allNums[currentIndex - 1] + allNums[currentIndex - 2]
    allNums.append(nextIndex)
    print(nextIndex)

Output:

2
3
5
8
13
21
34
...