*args, **kwargs，这两个是什么

def log(name = None):
   def decorator(func):
       def wrapper(*args , **kwargs):
           print('{}.start..'.format(name))
           print(args)
           print(kwargs)
           rst = func(*args , **kwargs)
           print('{}.end..'.format(name))
           return rst
       return wrapper
   return decorator

@log('hello')
def hello():
   print('hello')

@log
def sum1(a , b , *args, **kwargs):
   return a + b
if __name__ == '__main__':
   #hello()
   tset = sum1(5, 6 , k = 5 , v = 6)
   print(tset)

执行为什么出错