抽象数据类型和面向对象编程
class 包含 data method
ADT Abstract Data Type 抽象数据类型
Bag data: 容器
method : add
remove
len
iter
做一个抽象数据类型,包含数据和方法,方法包含添加数据,删除数据,数据长度,迭代数据。
class Bag(object):
def __init__(self, maxsize):
self.maxsize = maxsize
self._items = list()
def add(self, item):
if len(self) > self.maxsize:
raise Exception("Bag is Full")
self._items.append(item)
def remove(self,item):
self._items.remove(item)
def __len__(self):
return len(self._items)
def __iter__(self):
for item in self._items:
yield item
def test_bag():
bag = Bag(4)
bag.add(1)
bag.add(2)
bag.add(3)
assert len(bag) == 3
bag.remove(3)
assert len(bag) == 2
for i in bag:
print(i)