linked list in python

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())

1Full Linked List implementation at this link:
2https://github.com/shreyasvedpathak/Data-Structure-Python/tree/master/LinkedList

1
2class Node:
3    def __init__(self, val):
4        self.val = val
5        self.next = None
6    
7    def nexts(self, nexts):
8        self.next = nexts
9        
10        
11    def __repr__(self):
12        return f'{self.val} -> {self.next} '
13      
14      
15class LinkedList:
16    def __init__(self):
17        self.head = None
18    
19    def add(self, val):
20        if self.head == None:
21            self.head = val
22        else:
23            val.next = self.head
24            self.head = val
25    
26    def __repr__(self):
27        return self.head.__repr__()
28    
29    def __iter__(self):
30        li = self.head
31        while  li.next != None:
32            yield li.val
33            li = li.next
34        yield li.val
35    
36    def  __getitem__(self, n):
37        if n==0: return self.head.val
38        li = self.head
39        for i in range(n):
40            li = li.next
41        return li.val
42    
43    def __len__(self):
44        for i,v in enumerate(self):
45            pass
46        return i+1
47

1class Node:
2    def __init__(self, data):
3        self.data = data
4        self.next = None
5
6    def __repr__(self):
7        return self.data
8
9class LinkedList:
10    def __init__(self):
11        self.head = None
12
13    def __repr__(self):
14        node = self.head
15        nodes = []
16        while node is not None:
17            nodes.append(node.data)
18            node = node.next
19        nodes.append("None")
20        return " -> ".join(nodes)
21

1class LinkedList(object):
2    def __init__(self, head=None):
3        self.head = head
4
5	# ignored...  answer below
6    def get_position(self, position):
7        counter = 1
8        current = self.head
9        if position < 1:
10            return None
11        while current and counter <= position:
12            if counter == position:
13                return current
14            current = current.next
15            counter += 1
16        return None
17	# ignored...  answer above
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