MicroPython RP2 One Shot Timer Explorations

import time
from machine import Timer

class OneShot:
  def __init__(self, name, period, io):
    self.flag = False
    self.name = name
    self.period = period
    self.io = io
    self.io.lamp_clear(0)
    # self.timer = Timer()
    self.timer = Timer(period = self.period,
                    mode = Timer.ONE_SHOT,
                    callback = self.callback )
  def callback(self, t):
    self.flag = True
    self.io.lamp_toggle(0)
  def go(self):
    # self.timer.init()
    self.timer.init(period = self.period,
                    mode = Timer.ONE_SHOT,
                    callback = self.callback )
# testit
io.lamp_clear(0)
io.lamp_set(1)
bang = OneShot('reply', 1000, io )
print('starting...')
while(True):
  if bang.flag:
    bang.flag = False;
    io.lamp_toggle(1)
    print('...')
    bang.go()
  time.sleep_ms(10)