Well, there's also the fact that the entire thing could be replaced with...

    def cached_file_iterator(file_path):
        with open(file_path, 'r') as f:
            lines = [ line.strip() for line in f.readlines() ]
        yield from iter(lines)

    # Example usage:
    if __name__ == "__main__":
        file_path = 'example.txt'  # Replace with your file path
        
        iterator = cached_file_iterator(file_path)
        for line in iterator:
            print(line)

Which is functionally identical and FAR less code to maintain.