This should be compatible with your Cosc367 project

ai_range_syntax.py

from sequences import *

class ai_class:
    def __getitem__(self, items):
        if items[-1] is not Ellipsis:
            yield from items
            return

        expression = find_sequence(items[:-1])
        yield from items[:-1]

        x, y = items[-3:-1]
        i = len(items)
        while True:
            d = {'i': i, 'x': x, 'y': y,
                 '+': lambda a, b: a + b,
                 '-': lambda a, b: a - b,
                 '*': lambda a, b: a * b}
            r = evaluate(expression, d)
            yield r
            i += 1
            x = y
            y = r

ai = ai_class()

print(list(__import__('itertools').islice(ai[1, 1, 2, 3, 5, 8, ...], 15)))
# [1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610]