My code which adds fibonacci numbers to a list adds too many terms.

[deanhystad]

The reason you get two extra numbers in the list is because you are testing x[-3] >. You start with two values in x and j never catches up with the end of the list because each time you test the value of j you add a value to x.

If you want to stop at or before 100, use the DeaD_Eye's test. If you want to stop after the first value >= 100 (kind of what your original code looks like) just use:

x = [0, 1]
while x[-1] < 100:
    x.append(x[-1]+x[-2])
print(x)