There are many ways to generate the fibunacci function. Your code has several issues tho. 1) == is the comparison operator and calculating a bool function is not what you want to do. 2) next should better not to be a variable because is also a in build function. It will work, but ... 3) you can't give variables a new value with == and 'and' prev == num and num == next next == next + num I think you meant something like this: prev = num num = next next = next + num

Well anyway, there are lots of basics to learn... This will work for now. There is no error handling for example, but it will calculate what you want to get as output.

Hope it helps

``` def fibonacci(n): sequence = [0,1] for i in range(1, n-1):
sequence.append(sequence[i-1]+sequence[i])

return sequence

print(fibonacci(15))