Python program to Search an Element in a Circular Linked List

# Python program to Search an Element
# in a Circular Linked List
      
# Class to define node of the linked list    
class Node: 
    def __init__(self,data):    
        self.data = data;
        self.next = None;
        
class CircularLinkedList:
    
    # Declaring Circular Linked List
    def __init__(self):    
        self.head = Node(None);    
        self.tail = Node(None);    
        self.head.next = self.tail;    
        self.tail.next = self.head;    
        
    
    # Adds new nodes to the Circular Linked List
    def add(self,data):    
        
        # Declares a new node to be added
        newNode = Node(data); 
        
        # Checks if the Circular
        # Linked List is empty
        if self.head.data is None:
            
            # If list is empty then new node
            # will be the first node
            # to be added in the Circular Linked List
            self.head = newNode;
            self.tail = newNode;
            newNode.next = self.head;
        
        else:
            # If a node is already present then
            # tail of the last node will point to
            # new node
            self.tail.next = newNode;
            
            # New node will become new tail
            self.tail = newNode;
            
            # New Tail will point to the head
            self.tail.next = self.head;    
                
    # Function to search the element in the 
    # Circular Linked List
    def findNode(self,element):
        
        # Pointing the head to start the search
        current = self.head;
        i = 1;
        
        # Declaring f = 0
        f = 0;    
        # Check if the list is empty or not    
        if(self.head == None):
            print("Empty list"); 
        else:
            while(True):     
                # Comparing the elements
                # of each node to the
                # element to be searched
                if(current.data ==  element): 

                    # If the element is present
                    # then incrementing f
                    f += 1;    
                    break;
                
                # Jumping to next node
                current = current.next;    
                i = i + 1;    
                
                # If we reach the head
                # again then element is not 
                # present in the list so 
                # we will break the loop
                if(current == self.head):    
                    break;    
            
            # Checking the value of f
            if(f > 0):    
                print("element is present");    
            else:    
                print("element is not present");    
                
# Driver Code
if __name__ == '__main__':
    
    # Creating a Circular Linked List
    '''
    Circular Linked List we will be working on:
    1 -> 2 -> 3 -> 4 -> 5 -> 6
    '''
    circularLinkedList = CircularLinkedList();
    
    #Adding nodes to the list    
    circularLinkedList.add(1);
    circularLinkedList.add(2);
    circularLinkedList.add(3);
    circularLinkedList.add(4);
    circularLinkedList.add(5);
    circularLinkedList.add(6);
    
    # Searching for node 2 in the list    
    circularLinkedList.findNode(2);
    
    #Searching for node in the list    
    circularLinkedList.findNode(7);