<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def send_file(self, filename, status=200):
 """ Reads in the file 'filename' and sends bytes to client Parameters filename : str Filename of the file to read status : int, optional The HTTP status code, defaults to 200 (OK) """

        if isinstance(filename, Path) and sys.version_info >= (3, 5):
            self.message = filename.read_bytes()
        else:
            with io.FileIO(str(filename)) as f:
                self.message = f.read()
        self.status_code = status
        self.send_headers()
        self.write()
        self.write_eof()