_pyio.py 文件源码

def __init__(self, reader, writer,
                 buffer_size=DEFAULT_BUFFER_SIZE, max_buffer_size=None):
        """Constructor.

        The arguments are two RawIO instances.
        """
        if max_buffer_size is not None:
            warnings.warn("max_buffer_size is deprecated", DeprecationWarning, 2)

        if not reader.readable():
            raise IOError('"reader" argument must be readable.')

        if not writer.writable():
            raise IOError('"writer" argument must be writable.')

        self.reader = BufferedReader(reader, buffer_size)
        self.writer = BufferedWriter(writer, buffer_size)