问利用timeit分析串行通信

EN

def resp_time(n,msg):
  """Given number of tries - n and bytearray list"""

  msg = bytearray(msg)
  cnt = 0
  timer = 0 

  while cnt < n:
      time.sleep(INTERVAL)

      a = datetime.datetime.now()
      ser.flush()
      ser.write(msg)

      line = []
      for count in ser.read():
          line.append(count)
          if count == '\xFF':
              # print line
              break

      b = datetime.datetime.now()
      c = b-a
      # print c.total_seconds()*1000
      timer = timer + c.total_seconds()*1000
      cnt = cnt + 1

  return timer/n
ser = serial.Serial(COMPORT,BAUDRATE,serial.EIGHTBITS, serial.PARITY_NONE, serial.STOPBITS_ONE, timeout=16)
  if ser.isOpen():
    print "Serial port opened at: Baud:",COMPORT,BAUDRATE

 cmd = read_file()
 # returns a list of commands [msg1,msg2....]
 n = 100
 for index in cmd: 

   timer = resp_time(n,index)
   print "Time in msecs over %d runs: %f " % (n,timer)

def com_loop(msg):

  msg = bytearray(msg)

  time.sleep(INTERVAL)
  ser.flush()
  ser.write(msg)

  line = []
  for count in ser.read():
      line.append(count)
      if count == '\xFF':
          break
if __name__ == '__main__':
  import timeit 

  ser = serial.Serial(COMPORT,BAUDRATE,serial.EIGHTBITS, serial.PARITY_NONE, serial.STOPBITS_ONE, timeout=16)
  if ser.isOpen():
    print "Serial port opened at: Baud:",COMPORT,BAUDRATE

  cmd = read_file()
  # returns a list of commands [msg1,msg2....]
  n = 100
  for index in cmd: 

     t = timeit.timeit("com_loop(index)","from __main__ import com_loop;index=%s;" % index,number = n)
     print t/100