Constant time complexity

constant.py

from typing import Any, Dict, List


# Example 1
def list_lookup(list_: List[Any], index: int) -> Any:
    """Lookup a value in a list by index."""
    return list_[index]


# Example 2
def dict_lookup(dict_: Dict[Any, Any], key: Any) -> Any:
    """Lookup a value in a dictionary by key."""
    return dict_[key]