text: class appinfo(object):
  	def __init__(self, appkey, sid=None):
  		self.appkey = appkey
  		self.sid = sid
  
  
  def get_default_app_info():
  	pass
  
  
  def set_default_app_info(appkey, sid = None):
  	default = appinfo(appkey, sid)
  	global get_default_app_info
  	get_default_app_info = lambda: default
  