如果它旋转了，可以在Python中重新加载已打开的文件吗？

Question

我打开一个文件，读取文件，然后等待换行。有用。然后，文件旋转而不更改描述符（文件名保持不变）。我通过测量文件大小并将位置切换到0来检测到此事件。但是旧内容仍在内存中。有没有办法告诉python，当文件旋转时，您现在必须刷新缓冲区？谢谢

def readlines_then_tail(f, filename):
    """Iterate through lines and then wait for further lines"""
    where = 0
    while True:
        f.seek(where)
        line = f.readline()
        if line:
            yield line
            where = f.tell()
        else:
            where = f.tell()
            time.sleep(SLEEP_INTERVAL)
            """File can be rotated. Get it's size and if it is less than a current position start from the beginning"""
            file_size = os.path.getsize(filename)
            if int(where) > file_size:
               where = 0