84     process: subprocess.Popen = None  variable in MicroPython_Test
89         if cls.process is None:
93         cls.process.stdin.write(cmd)
94         cls.process.stdin.flush()
110                 char = cls.process.stdout.read(1)
156         cls.process = subprocess.Popen(
180         if cls.process is not None:
185             if not cls.process.stdin.closed:
186                 cls.process.stdin.close()
188             os.killpg(os.getpgid(cls.process.pid), signal.SIGTERM)
190             cls.process.wait()
192             if not cls.process.stdout.closed:
193                 cls.process.stdout.close()
195             if not cls.process.stderr.closed:
196                 cls.process.stderr.close()
198             cls.process = None
216         if self.__class__.process is None: