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Python Articles
Page 9 of 852
Python Program to Check String is Palindrome using Stack
When it is required to check if a string is a palindrome using stack data structure, a stack class is created, and push and pop methods are defined to add and delete values from stack. Another method checks to see if the stack is empty or not.Below is a demonstration for the same −Exampleclass Stack_structure: def __init__(self): self.items = [] def check_empty(self): return self.items == [] def push_val(self, data): self.items.append(data) def pop_val(self): return self.items.pop() my_instance = Stack_structure() text_input = input('Enter ...
Read MorePython Program to Print the Alternate Nodes in a Linked List using Recursion
When it is required to print the alternate nodes in a linked list using recursion, a method to add elements to the linked list, a method to display the elements of the linked list, and a method to get the alternate values of a linked list are defined. Another helper function is used that calls the previously defined method to get alternate values.Below is a demonstration for the same −Exampleclass Node: def __init__(self, data): self.data = data self.next = None class my_linked_list: def __init__(self): self.head = None ...
Read MorePython Program to Implement a Stack using Linked List
When it is required to implement a stack data structure using a linked list, a method to add (push values) elements to the linked list, and a method to delete (pop values) the elements of the linked list are defined.Below is a demonstration for the same −Exampleclass Node: def __init__(self, data): self.data = data self.next = None class Stack_structure: def __init__(self): self.head = None def push_val(self, data): if self.head is None: self.head = Node(data) else: ...
Read MorePython Program to Implement Queue Data Structure using Linked List
When it is required to implement a queue data structure using a linked list, a method to add (enqueue operation) elements to the linked list, and a method to delete (dequeue operation) the elements of the linked list are defined.Below is a demonstration for the same −Exampleclass Node: def __init__(self, data): self.data = data self.next = None class Queue_structure: def __init__(self): self.head = None self.last = None def enqueue_operation(self, data): if self.last is None: self.head = Node(data) ...
Read MorePython Program to Add Corresponding Positioned Elements of 2 Linked Lists
When it is required to add the corresponding elements of specific position in two linked lists, a method to add elements to the linked list, a method to print the elements of the linked list, and a method to add elements to corresponding positions of a linked list are defined. Two lists instances are created and the previously defined method is called on these linked list instances.Below is a demonstration for the same −Exampleclass Node: def __init__(self, data): self.data = data self.next = None class LinkedList_structure: def __init__(self): ...
Read MorePython program to count Bidirectional Tuple Pairs
When it is required to count the number of bidirectional tuple pairs in a list of tuples, the list can be iterated over using nested loops, and the ‘AND’ operation is performed on the first element and result of equality between first and second element.Below is a demonstration of the same −Examplemy_list = [(45, 67), (11, 23), (67, 45), (23, 11), (0, 9), (67, 45)] print("The list is : ") print(my_list) my_result = 0 for idx in range(0, len(my_list)): for iidx in range(idx + 1, len(my_list)): if my_list[iidx][0] == my_list[idx][1] and my_list[idx][1] == my_list[iidx][0]: ...
Read MorePython Program to Find the first Common Element between the 2 given Linked Lists
When it is required to find the common element that occurs for the first time between two linked lists, a method to add elements to the linked list, and a method to get the common element that occurs for the first time in these linked lists is defined.Below is a demonstration for the same −Exampleclass Node: def __init__(self, data): self.data = data self.next = None class LinkedList_structure: def __init__(self): self.head = None self.last_node = None def add_vals(self, data): if self.last_node ...
Read MorePython program to unique keys count for Value in Tuple List
When it is required to get the count of unique keys for values in a list of tuple, it can be iterated over and the respective counts can be determined.Below is a demonstration of the same −Exampleimport collections my_result = collections.defaultdict(int) my_list = [[('Hello', 'Hey')], [('Jane', 'Will')], [('William', 'John')], [('Hello', 'Hey')], [('z', 'q')]] print("The list of list is :") print(my_list) for elem in my_list: my_result[elem[0]] += 1 print("The result is : ") print(my_result)OutputThe list of list is : [[('Hello', 'Hey')], [('Jane', 'Will')], [('William', 'John')], [('Hello', 'Hey')], [('z', 'q')]] The result is : defaultdict(, {('Hello', 'Hey'): 2, ('Jane', 'Will'): ...
Read MorePython Program to Find Number of Occurrences of All Elements in a Linked List
When it is required to find the number of occurences of all the elements of a linked list, a method to add elements to the linked list, a method to print the elements and a method to find the occurrence of all elements in the linked list are defined.Below is a demonstration for the same −Exampleclass Node: def __init__(self, data): self.data = data self.next = None class LinkedList_structure: def __init__(self): self.head = None self.last_node = None def add_vals(self, data): if ...
Read MorePython Program to Reverse only First N Elements of a Linked List
When it is required to reverse a specific set of elements in a linked list, a method named ‘reverse_list’ is defined. This iterates through the list, and reverses the specific set of elements.Below is a demonstration for the same −Exampleclass Node: def __init__(self, data): self.data = data self.next = None class LinkedList_structure: def __init__(self): self.head = None self.last_node = None def add_vals(self, data): if self.last_node is None: self.head = Node(data) self.last_node = ...
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