def pop(self):
        """
        >>> l = DLL()
        >>> l.push(1)
        >>> l.pop()
        1
        """
        k = self._last.value
        self.deletenode(self._last)
        return k
def pop(self):
        
        k = self._last.value
        self.deletenode(self._last)
        return k
def pop ( self ) : k = self . _last . value self . deletenode ( self . _last ) return k
>>> l = DLL()
        >>> l.push(1)
        >>> l.pop()
        1
>>> l = DLL () >>> l . push ( 1 ) >>> l . pop () 1