<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def write(self, data, echo=None):
 """ Write data to channel. Args: data(bytes):
 The data to write to the channel. echo(bool):
 Whether to echo the written data to stdout. Raises: EOFError: If the channel was closed before all data was sent. """


        if echo or (echo is None and self.echo):
            sys.stdout.write(data.decode('latin1'))
            sys.stdout.flush()
        self.channel.write(data)