Python Forum

Hi there,

I am new with Python and would like anyone to help me with the following code:

fibLimit= eval(input('Enter how many Fibonacci numbers you would like to print = '))

fbNext= [None] * int(fibLimit)

fbNext[0] = 1
fbNext[1] = 1

for i in range(len(fbNext)):
    if i < 2:
        print(fbNext[i])
    else:
        nex = fbNext[i] + fbNext[i - 1]
        print(nex)

Enter how many Fibonacci numbers you would like to print = 5
1
1

Error:
Traceback (most recent call last):
  File "D:My Python Code\CHP2.py", line 40, in <module>
    nex = fbNext[i] + fbNext[i - 1]
TypeError: unsupported operand type(s) for +: 'NoneType' and 'int'

1. Don't do this:
fibLimit= eval(input('Enter how many Fibonacci numbers you would like to print = '))
instead:
fibLimit= input('Enter how many Fibonacci numbers you would like to print = ')

That is, well, kinda screwed up. Sorry. Here:

fibLimit= int(input('Enter how many Fibonacci numbers you would like to print = '))
fbNext = [0,1]
 
for i in range(fibLimit):
    if i<2 :
        print(fbNext[i])
    else:
        fbNext.append(fbNext[i-2] + fbNext[i - 1])
        print(fbNext[i])

fibLimit should be int() rather than eval()
fbNext can be initialized as [0,1]
Any time you see range(len(xxx)) re-evaluate. That is almost always wrong. You want the range of fibLimit, not anything to do with fbNext.
I wrote it so you append to the fbNext list as that seemed to be your preference, fixed the syntax and code.

@jefsummers: Thank You very Much But I had to change the starting as Fibonacci starts with "1".

Also I am new to python so I agree that it was kinda screwed up

The final code is:

fibLimit= int(input('Enter how many Fibonacci numbers you would like to print = '))

fbNext = [1,1]

for i in range(fibLimit):
    if i < 2:
        print(fbNext[i])
    else:
        fbNext.append(fbNext[i-2] + fbNext[i - 1])
        print(fbNext[i])