linked list python example

1class Node:
2    def __init__(self, data = None, next_node = None):
3        self.data = data
4        self.nextNode = next_node
5
6    def get_data(self):
7        return self.data
8
9    def set_data(self, data):
10        self.data = data
11
12    def get_nextNode(self):
13        return self.nextNode
14
15    def set_nextNode(self, nextNode):
16        self.nextNode = nextNode
17
18
19class LinkedList:
20    def __init__(self, head = None):
21        self.head = head
22
23
24    def add_Node(self, data):
25        # if empty
26        if self.head == None:
27            self.head = Node(data)
28
29
30        # not empty
31        else:
32            curr_Node = self.head
33            
34            # if node added is at the start
35            if data < curr_Node.get_data():
36                self.head = Node(data, curr_Node)
37                
38            # not at start
39            else:
40                while data > curr_Node.get_data() and curr_Node.get_nextNode() != None:
41                    prev_Node = curr_Node
42                    curr_Node = curr_Node.get_nextNode()
43
44                # if node added is at the middle
45                if data < curr_Node.get_data():
46                    prev_Node.set_nextNode(Node(data, curr_Node))
47                
48
49                # if node added is at the last
50                elif data > curr_Node.get_data() and curr_Node.get_nextNode() == None:
51                    curr_Node.set_nextNode(Node(data))
52
53
54
55    def search(self, data):
56        curr_Node = self.head
57        while curr_Node != None:
58            if data == curr_Node.get_data():
59                return True
60
61            else:
62                curr_Node = curr_Node.get_nextNode()
63
64        return False
65
66
67    def delete_Node(self, data):
68        if self.search(data):
69            # if data is found
70
71            curr_Node = self.head
72            #if node to be deleted is the first node
73            if curr_Node.get_data() == data:
74                self.head = curr_Node.get_nextNode()
75
76            else:
77                while curr_Node.get_data() != data:
78                    prev_Node = curr_Node
79                    curr_Node = curr_Node.get_nextNode()
80                    
81                #node to be deleted is middle
82                if curr_Node.get_nextNode() != None:
83                    prev_Node.set_nextNode(curr_Node.get_nextNode())
84
85                # node to be deleted is at the end
86                elif curr_Node.get_nextNode() == None:
87                    prev_Node.set_nextNode(None)
88
89        else:
90            return "Not found."
91
92    def return_as_lst(self):
93        lst = []
94        curr_Node = self.head
95        while curr_Node != None:
96            lst.append(curr_Node.get_data())
97            curr_Node = curr_Node.get_nextNode()
98
99        return lst
100
101    def size(self):
102        curr_Node = self.head
103        count = 0
104        while curr_Node:
105            count += 1
106            curr_Node = curr_Node.get_nextNode()
107        return count
108
109      
110## TEST CASES #
111test1 = LinkedList()
112test2 = LinkedList()
113test1.add_Node(20)
114test1.add_Node(15)
115test1.add_Node(13)
116test1.add_Node(14)
117test1.delete_Node(17)
118print(test1.return_as_lst())
119print(test2.size())

1pip install llist

1
2class Node:
3    def __init__(self, data=None):
4        self.data = data
5        self.next = None
6
7class SLinkedList:
8    def __init__(self):
9        self.head = None
10
11    def Atbegining(self, data_in):
12        NewNode = Node(data_in)
13        NewNode.next = self.head
14        self.head = NewNode
15		
16# Function to remove node
17    def RemoveNode(self, Removekey):
18
19        HeadVal = self.head
20
21        if (HeadVal is not None):
22            if (HeadVal.data == Removekey):
23                self.head = HeadVal.next
24                HeadVal = None
25                return
26
27        while (HeadVal is not None):
28            if HeadVal.data == Removekey:
29                break
30            prev = HeadVal
31            HeadVal = HeadVal.next
32
33        if (HeadVal == None):
34            return
35
36        prev.next = HeadVal.next
37
38        HeadVal = None
39
40    def LListprint(self):
41        printval = self.head
42        while (printval):
43            print(printval.data),
44            printval = printval.next
45
46
47llist = SLinkedList()
48llist.Atbegining("Mon")
49llist.Atbegining("Tue")
50llist.Atbegining("Wed")
51llist.Atbegining("Thu")
52llist.RemoveNode("Tue")
53llist.LListprint()