medium_type_hint_final.py

from typing import Iterable, TypeVar, Optional

T = TypeVar('T')


def linear_search(l: Iterable[T], 
                  target: T, 
                  upper_limit: Optional[int]=None) -> bool:
    
    for idx, item in enumerate(l):
        if item == target:
            return True
        if upper_limit is not None and idx >= upper_limit:
            break
    return False