Function to check for a key in a shelve
    Args:
        file_name: Shelve storage file name
        save_key: The name of the key the item is stored in
        file_location: The location of the file, derive from the os module

    Returns: returns true or false

def verify_key_in_shelve(file_name, save_key, file_location):
    """
    Function to check for a key in a shelve
    Args:
        file_name: Shelve storage file name
        save_key: The name of the key the item is stored in
        file_location: The location of the file, derive from the os module

    Returns: returns true or false

    """
    file = __os.path.join(file_location, file_name)
    shelve_store = __shelve.open(file)
    exists = shelve_store.get(save_key)
    shelve_store.close()
    if exists:
        return True

    elif not exists:
        return False