Execute a compiled code object, and write the output back to the client.

def run_command(self, codeobj):
        """Execute a compiled code object, and write the output back to the client."""
        try:
            value, stdout = yield from self.attempt_exec(codeobj, self.namespace)
        except Exception:
            yield from self.send_exception()
            return
        else:
            yield from self.send_output(value, stdout)