parameters: (action_object, step_desc, value, loc)
docstring: 持续监听页面元素状态（智能等待），直到发现元素
  	:param action_object:
  	:param step_desc:
  	:param value:
  	:param loc:
  	:return:
docstring_summary: 持续监听页面元素状态（智能等待），直到发现元素
  	:param action_object:
  	:param step_desc:
  	:param value:
  	:param loc:
  	:return:
docstring_tokens: 持续监听页面元素状态（智能等待），直到发现元素 : param action_object : : param step_desc : : param value : : param loc : : return :
function: def action_untilshow(action_object, step_desc, value, loc):
  	"""
  	持续监听页面元素状态（智能等待），直到发现元素
  	:param action_object:
  	:param step_desc:
  	:param value:
  	:param loc:
  	:return:
  	"""
  	for i in range(300):
  		try:
  			if action_object.find_element(loc) is not None:
  				break
  		except:
  			pass
  		time.sleep(1)
function_tokens: def action_untilshow ( action_object , step_desc , value , loc ) : for i in range ( 300 ) : try : if action_object . find_element ( loc ) is not None : break except : pass time . sleep ( 1 )