docs: def generator(self,gen,*args,**kwargs):
          """
              Use this function to enter and exit the context at the beginning and end of a generator.
  
              Example::
  
                  li = litus.Lists()
                  for i in li.generator(range(100)):
                      li.append(i)
  
          """
          with self(*args,**kwargs):
              for i in gen:
                  yield i