code: def remove_programmer(programmer_id):
      
  
      log.debug('remove %s', programmer_id)
      lines = programmers_txt().lines()
      lines = filter(
          lambda x: not x.strip().startswith(programmer_id + '.'), lines)
      programmers_txt().write_lines(lines)
docs: remove programmer.
  
      :param programmer_id: programmer id (e.g. 'avrisp')
      :rtype: None