AbstractStreamAdapter.py 文件源码

def available(self):
        """
        This is duplicate functionality if we have a HighPerformanceStreamIO.
        But we also want to support those that aren't. TODO: Better solution?
        """
        curPos = self._stream.tell()
        self._stream.seek(0, SEEK_END)
        endPos = self._stream.tell()
        self._stream.seek(curPos)
        return endPos-curPos