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python實(shí)現(xiàn)數(shù)據(jù)結(jié)構(gòu)中雙向循環(huán)鏈表操作的示例

更新時(shí)間：2020年10月09日 11:01:30 作者：GUET_DM_WLB

這篇文章主要介紹了python實(shí)現(xiàn)數(shù)據(jù)結(jié)構(gòu)中雙向循環(huán)鏈表操作的示例，文中通過(guò)示例代碼介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值，需要的朋友們下面隨著小編來(lái)一起學(xué)習(xí)學(xué)習(xí)吧

看此博客之前建議先看看B站的視頻python數(shù)據(jù)結(jié)構(gòu)與算法系列課程，該課程中未實(shí)現(xiàn)雙向循環(huán)鏈表的操作，所以我按照該視頻的鏈表思路實(shí)現(xiàn)了雙向循環(huán)鏈表的操作，歡迎大家閱讀與交流，如有侵權(quán)，請(qǐng)聯(lián)系博主！

下面附上代碼：

class Node:
  def __init__(self, elem):
    self.elem = elem
    self.prev = None
    self.next = None


class DoubleCycleLinkList:
  def __init__(self, node=None):
    self.__head = node

  def is_empty(self):
    """判空"""
    if self.__head is None:
      return True
    return False

  def length(self):
    """鏈表長(zhǎng)度"""
    if self.is_empty():
      return 0
    cur = self.__head
    count = 1
    while cur.next is not self.__head:
      count += 1
      cur = cur.next
    return count

  def travel(self):
    """遍歷鏈表"""
    if self.is_empty():
      return
    cur = self.__head
    while cur.next is not self.__head:
      print(cur.elem, end=" ")
      cur = cur.next
    print(cur.elem, end=" ")
    print("")

  def add(self, elem):
    """頭插法"""
    node = Node(elem)
    if self.is_empty():
      self.__head = node
      node.prev = node
      node.next = node
    else:
      self.__head.prev.next = node
      node.prev = self.__head.prev
      node.next = self.__head
      self.__head.prev = node
      self.__head = node

  def append(self, elem):
    """尾插法"""
    node = Node(elem)
    if self.is_empty():
      self.__head = node
      node.prev = node
      node.next = node
    else:
      node.next = self.__head
      node.prev = self.__head.prev
      self.__head.prev.next = node
      self.__head.prev = node

  def insert(self, pos, elem):
    """任一位置（pos）插入， 下標(biāo)從0數(shù)起"""
    if pos <= 0:
      self.add(elem)
    elif pos > (self.length() - 1):
      self.append(elem)
    else:
      count = 0
      cur = self.__head
      node = Node(elem)
      while count < (pos - 1):
        count += 1
        cur = cur.next
      node.next = cur.next
      node.prev = cur
      node.next.prev = node
      cur.next = node

  def remove(self, elem):
    """刪除某一節(jié)點(diǎn)，若有多個(gè)符合條件的節(jié)點(diǎn)，刪除第一個(gè)即可"""
    if self.is_empty():
      return
    cur = self.__head
    while cur.next is not self.__head:
      if cur.elem == elem:
        if cur is self.__head:
          self.__head = cur.next
          cur.prev.next = cur.next
          cur.next.prev = cur.prev
        else:
          cur.prev.next = cur.next
          cur.next.prev = cur.prev
        break
      cur = cur.next
    if cur.elem == elem:
      cur.prev.next = self.__head
      self.head = cur.prev

  def search(self, elem):
    """查找某一個(gè)節(jié)點(diǎn)"""
    if self.is_empty():
      return False
    cur = self.__head
    while cur.next is not self.__head:
      if cur.elem == elem:
        return True
      cur = cur.next
    # while中處理不到尾節(jié)點(diǎn)，所以進(jìn)行最后尾節(jié)點(diǎn)的判斷
    if cur.elem == elem:
      return True
    return False

到此這篇關(guān)于python實(shí)現(xiàn)數(shù)據(jù)結(jié)構(gòu)中雙向循環(huán)鏈表操作的示例的文章就介紹到這了,更多相關(guān)python 雙向循環(huán)鏈表操作內(nèi)容請(qǐng)搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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