def pop_min (self): return Linked_list.remove_from_head(self)
def pop(self): if self.size == 0: return None return_value = Linked_list.remove_from_head(self) return return_value
def pop_min (self): return Linked_list.remove_from_head(self)
def pop(self): if self.size == 0: return None return_value = Linked_list.remove_from_head(self) return return_value