单链表（python3）

旧城等待， 2022-05-22 12:11 145阅读 0赞

# 单链表----------------------------------------
    class ListNode:  # 单链表的定义
        def __init__(self, value, pointer):
            self.elem = value
            self.next = pointer
    
    
    class ListHandle:  # 单链表的操作
        def __init__(self):  # 新建单链表
            self.head = None
            self._length = 0
    
        def is_empty(self):  # 单链表的判空
            # if self.elem is None:
            # print('单链表为空')
            # return True
            # else:
            # print('单链表不为空')
            # return False
            if self._length == 0:
                print('单链表为空')
                return True
            else:
                print('单链表不为空')
                return False
    
        def get_length(self):  # 求单链表的长度
            # p = self.head
            # temp = 0
            # while p.next is not None:
            # temp += 1
            # p = p.next
            # return temp
            print('单链表的长度为%d' % self._length)
            return self._length
    
        def add_node(self, value):  # 增加节点
            # if self.elem is None:
            # list_1 = List(value, None)
            # return list_1
            # else:
            # p = self.head
            # while p.next != 'None':
            # p = self.next
            # p.next = List(value, None)
            return
    
        def ergodic_node(self, value):  # 遍历单链表
            p = self.head
            temp = 1
            while p.next is not None:
                if p.elem == value:
                    print('单链表中存在此元素')
                    return temp
                temp += 1
                p = p.next
            print('单链表中不存在此元素')
            return False
    
        def first_insert_node(self, value):  # 首端插入节点
            p_1 = ListNode(value, None)
            p_2 = self.head
            self.head = p_1.elem
            self.head.next = p_2
            self._length = self._length + 1
            return
    
        def appoint_insert_first_node(self, value, times):  # 在指定位置前插入节点
            if times >= self._length:
                print('错误')
                return
            p_1 = ListNode(value, None)
            temp = 0
            p_2 = self.head
            while p_2.next is not None:
                temp += 1
                p_2 = p_2.next
                if temp == times - 1:
                    break
            p_3 = p_2.next
            p_2.next = p_1.elem
            p_1.next = p_3.elem
            self._length = self._length + 1
            return
    
        def appoint_insert_end_node(self, value, times):  # 在指定位置后插入节点
            if times >= self._length:
                print('错误')
                return
            p_2 = ListNode(value, None)
            p_1 = self.head
            temp = 0
            while p_1.next is not None:
                temp += 1
                p_1 = p_1.next
                if temp == times:
                    break
            self._length = self._length + 1
            p_3 = p_2.next
            p_1.next = p_2.elem
            p_2.next = p_3.elem
            return
    
        def end_insert_node(self, value):  # 尾端插入节点
            p_2 = ListNode(value, None)
            self._length = self._length + 1
            p_1 = self.head
            while p_1 is not None:
                p_1 = p_1.next
            p.next = p_2.elem
            return
    
        def first_delete_node(self):  # 首端删除节点
            self.head = self.head.next
            self._length = self._length - 1
            return
    
        def appoint_delete_times_node(self, times):  # 删除指定位置节点
            p_1 = self.head
            temp = 0
            while p_1.next is not None:
                p_1 = p_1.next
                temp += 1
                if temp == times - 1:
                    break
            p_2 = p_1.next
            p_1.next = p_2.elem
            self._length = self._length - 1
            return
    
        def appoint_delete_value_node(self, value):  # 删除指定值节点
            p_1 = self.head
            p_2 = p_1.next
            p_3 = p_2.next
            if value == self.head.elem:
                self.head = self.head.next
                self._length = self._length - 1
            temp = 0
            while p_2.next is not None:
                if p_2.elem == value:
                    p_1.next = p_3.elem
                    temp += 1
                p_2 = p_2.next
            self._length = self._length - temp
            return
    
        def end_delete_node(self):  # 尾端删除节点
            p = self.head
            while p.next.next is not None:
                p = p.next
            p.next = None
            p._length = p._length - 1
            return
    
        def reversal_list(self):  # 反转单链表
            p_1 = self.head
            p = self.head
            p_2 = p_1.next
            p_1.next = None
            while p.next is not None:
                p_2.next = p_1.elem
                p_1 = p_1.next
                p_2 = p_2.next
            p.head = p_2.elem
            return
    
        def print_all(self):  # 打印单链表的所有项
            p = self.head
            while p.elem is not None:
                print(p.elem)
                p = p.next
    
        def change_list_array(self):  # 把单链表转为数组输出
            array = []
            p = self.head
            while p.elem is not None:
                array.append(p.elem)
                p = p.next
            return array
    
    
    if __name__ == "__main__":
        # 创建空表
        list_test = ListNode(None, None)
        # 对表赋值n次
        for i in range(n):
            list_test.next = ListNode(i, None)
            list_test = list_test.next
        # 使用while循环输出单链表
        while list_test.elem is not None:
            print(list_test.elem)
            list_test = list_test.next
        # 打印链表所有项的值
        list_test.print_all()