为什么要限制自己使用lambda?做一个微调器，最容易保持状态:

Why are you limiting yourself to a lambda? To do a spinner, it's easiest to maintain state:

class Spinner(object):
  def __init__(self):
    self._chars = r"-\|/-\|/"
    self._pos = 0

  def spin(self):
    sys.stdout.write(self._chars[self._pos])
    sys.stdout.write("\r")
    sys.stdout.flush()
    self._pos += 1
    if self._pos >= len(self._chars):
      self._pos = 0
    return True

spinner = Spinner()
gobject.timeout_add(2 * 1000, spinner.spin)

注意:以上内容未经测试，但应该使总体思路足够清楚.

Note: the above is untested, but should make the general idea clear enough.