初始化的辅助方法：
class MyStream(object): @classmethod def from_file(cls, filepath, ignore_comments=False): with open(filepath, 'r') as fileobj: for obj in cls(fileobj, ignore_comments): yield obj @classmethod def from_socket(cls, socket, ignore_comments=False): raise NotImplemented # Placeholder until implemented def __init__(self, iterable, ignore_comments=False): ...
