wrap islice

slice-able.py

import sys
from itertools import islice
from typing import Iterator, List, Any

class Slicable:
    def __init__(self, a: Iterator):
        self.a = a

    def __getitem__(self, s: 'slice') -> List[Any]:
        return list(islice(self.a, s.start, s.stop, s.step))

def fib():
    a, b = 0, 1
    while True:
        a, b = a + b, a
        yield a

a = Slicable(fib())
print(a[:10:2])