python 类成员函数的参数问题

今天遇到一个没见过的代码：

class Iface:
  def ping(self, ):                                                                                                                                                                      
    pass                                                                                                                                                                                 
  def say(self, msg):                                                                                                                                                                    
    """
    Parameters:                                                                                                                                                                          
     - msg                                                                                                                                                                               
    """
    pass

这里ping()的参数是以逗号结尾，是指参数为有一个元素的元组吗？