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Python Program to Search for an Element in the Linked List without using Recursion
When it is required to search for an element in a linked list without using recursion method, a method to add values to the linked list, as well as a method to display the elements of a Linked List.
It would also have a method that helps find the index of the element that is being searched.
Below is a demonstration for the same −
Example
class Node:
def __init__(self, data):
self.data = data
self.next = None
class my_linked_list:
def __init__(self):
self.head = None
self.last_node = None
def add_value(self, my_data):
if self.last_node is None:
self.head = Node(my_data)
self.last_node = self.head
else:
self.last_node.next = Node(my_data)
self.last_node = self.last_node.next
def print_it(self):
curr = self.head
while curr is not None:
print(curr.data)
curr = curr.next
def find_index_val(self, my_key):
curr = self.head
index_val = 0
while curr:
if curr.data == my_key:
return index_val
curr = curr.next
index_val = index_val + 1
return -1
my_instance = my_linked_list()
my_list = [67, 4, 78, 98, 32, 0, 11, 8]
for data in my_list:
my_instance.add_value(data)
print('The linked list is : ')
my_instance.print_it()
print()
my_key = int(input('What value would you search for? '))
index_val = my_instance.find_index_val(my_key)
if index_val == -1:
print(str(my_key) + ' was not found.')
else:
print('Element was found at index ' + str(index_val) + '.')
n = int(input('How many elements would you wish to add ? '))
for i in range(n):
data = int(input('Enter data : '))
my_instance.add_value(data)
print('The linked list is : ')
my_instance.print_it()
Output
The linked list is : 67 4 78 98 32 0 11 8 What value would you search for? 11 Element was found at index 6. How many elements would you wish to add ? 2 Enter data : 111 Enter data : 56 The linked list is : 67 4 78 98 32 0 11 8 111 56
Explanation
The ‘Node’ class is created.
Another ‘my_linked_list’ class with required attributes is created.
It has an ‘init’ function that is used to initialize the first element, i.e the ‘head’ to ‘None’ and last node to ‘None’.
Another method named ‘add_value’ is defined, that is used to add data to the linked list.
Another method named ‘print_it’ is defined that is used to display the linked list data on the console.
Another method named ‘find_index_val’ is defined that helps find the index of the element entered by the user.
An object of the ‘my_linked_list’ class is created.
A list is defined.
This list is iterated over, and the methods are called on it to add data.
This is displayed on the console using the ‘print_it’ method.
The user input is asked for the element to be searched.
The ‘find_index_val’ method is called on this, and output is displayed on the console.
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