[Python知识库]Python数据结构，队列，实现出队入队

class myDeque:
    def __init__(self,iterable=None,maxlen=4):
        if iterable==None:
            self._content=[]
            self._current=0
        else:
            self._content=list(iterable)    #队列内容
            self._current=len(iterable)     #队列长度
        self._size=maxlen                   #队列的最大长度
        if self._size<self._current:
            self._size=self._current
    def __del__(self):
        del self._content
    #修改队列大小方法1
    def setSize1(self,size):
        if size<self._current:
            for i in range(size,self._current)[::-1]:       #利用逆序从后面删除
                del self._content[i]
        self._size=size
    def setSize2(self,size):
        if size<self._current:
            self._content=self._content[:size]
        self._size=size
    #右入队
    def appendright(self,element):
        if self._current<self._size:
            self._content.append(element)
            self._current+=1
        else:
            print('quen is full')
    #左入队
    def appendleft(self,element):
        if self._current<self._size:
            self._content.insert(0,element)
            self._current+=1
        else:
            print('quen is full')
    #右出队
    def popright(self):
        if not self.isEmpty():
            self._content.pop(0)
            self._current-=1
        else:
            print('quen is empty')
    #左出队
    def popleft(self):
        if not self.isEmpty():
            self._content.pop()
            self._current-=1
        else:
            print('quen is empty',self.isEmpty())
    
        
    #队列置空
    def clear(self):
        self._content=[]
        self._current=0
    #判空
    def isEmpty(self):
        return not self._current
    #判满
    def isfull(self):
        if self._current==self._size:
            return True
        else:
            return False
    #获取队列信息
    def get(self):
        print(self._content,self._current,self._size)

if __name__ == '__main__':
    myquen=myDeque([1,3,5])
    # myquen.setSize1()
    # myquen.appendleft(5)
    myquen.isfull()
    # myquen.isEmpty()
    # myquen.get()