I could use this as an example for SBCW

cached_fetch.py

def cached_fetch(key: callable, base_path=".", max_age=None):
    """Decorates a function that returns Response object from Python Requests.

    Example 1:

        @cached_fetch(generate_key)
        def make_cached_request(url, *args, **kwargs):
            return requests.get(url, *args, **kwargs)

    Example 2:

        resp = cached_fetch(lambda: key)(requests.get)(url, params=params)

    :param key: A function that generates a key
    :param base_path:
    :param max_age: Maximum age to keep the page cached (in seconds)
    """
    if max_age:
        raise NotImplementedError()
    # TODO: Check if base_path is a directory
    if not os.path.exists(base_path):
        raise OSError(f"Base path '{base_path}' does not exist")

    def decorator(func):
        @functools.wraps(func)
        def wrapper(*args, **kwargs):
            path = os.path.join(base_path, key())
            if os.path.exists(path):
                with open(path) as fin:
                    return fin.read()
            else:
                resp = func(*args, **kwargs)
                with open(path, "w") as fout:
                    # TODO: Handle binary data properly
                    fout.write(resp.text)
                return resp
        return wrapper
    return decorator