Create circular_linked_list.py

LinkedLists all Types/circular_linked_list.py

@@ -0,0 +1,134 @@
+from turtle import mode
+
+
+class Node :
+    def __init__(self , data , next = None):
+        self.data = data
+        self.next = next
+
+class CircularLinkedList :
+    def __init__(self):
+        self.head = self.tail = None
+        self.length = 0
+
+    def insert_at_beginning(self , data):
+        node = Node(data , self.head)
+        if self.head is None:
+            self.head = self.tail = node
+            node.next = node
+            self.length += 1
+            return
+        self.head = node
+        self.tail.next = node
+        self.length += 1
+
+    def insert_at_end(self , data):
+        node = Node(data , self.head)
+        if self.head is None:
+            self.head = self.tail = node
+            node.next = node
+            self.length += 1
+            return
+        self.tail.next = node
+        self.tail = node
+        self.length += 1
+
+    def len(self):
+        return self.length
+
+    def pop_at_beginning(self):
+        if self.head is None:
+            print('List is Empty!')
+            return
+        self.head = self.head.next
+        self.tail.next = self.head
+        self.length -= 1 
+
+    def pop_at_end(self):
+        if self.head is None:
+            print('List is Empty!')
+            return
+        temp = self.head
+        while temp:
+            if temp.next is self.tail:
+                self.tail.next = None
+                self.tail = temp
+                temp.next = self.head
+                self.length -= 1
+                return 
+            temp = temp.next
+
+    def insert_values(self , arr : list):
+        self.head = self.tail = None
+        self.length = 0
+        for i in arr:
+            self.insert_at_end(i)
+
+    def print(self):
+        if self.head is None:
+            print('The List is Empty!')
+            return
+        temp = self.head.next
+        print(f'{self.head.data} ->' , end=' ')
+        while temp != self.head:
+            print(f'{temp.data} ->' , end=' ')
+            temp = temp.next
+        print(f'{self.tail.next.data}')  
+
+    def insert_at(self , idx , data):
+        if idx == 0:
+            self.insert_at_beginning(data)
+            return
+        elif idx == self.length:
+            self.insert_at_end(data)
+            return
+        elif 0 > idx or idx > self.length:
+            raise Exception('Invalid Position')
+            return
+        pos = 0
+        temp = self.head
+        while temp:
+            if pos == idx - 1:
+                node = Node(data , temp.next)
+                temp.next = node
+                self.length += 1
+                return
+            pos += 1
+            temp = temp.next 
+
+    def remove_at(self , idx):
+        if 0 > idx or idx >= self.length:
+            raise Exception('Invalid Position')
+        elif idx == 0:
+            self.pop_at_beginning()
+            return
+        elif idx == self.length - 1:
+            self.pop_at_end()
+            return
+        temp = self.head
+        pos = 0
+        while temp:
+            if pos == idx - 1:
+                temp.next = temp.next.next
+                self.length -= 1
+                return
+            pos += 1
+            temp = temp.next            
+
+def main():
+    ll = CircularLinkedList()
+    ll.insert_at_end(1)        
+    ll.insert_at_end(4)        
+    ll.insert_at_end(3)        
+    ll.insert_at_beginning(2)
+    ll.insert_values([1 , 2, 3 ,4 ,5 ,6,53,3])
+    # ll.pop_at_end()  
+    ll.insert_at(8, 7) 
+    # ll.remove_at(2)     
+    ll.print()
+    print(f'{ll.len() = }')
+
+
+
+if __name__ == '__main__':
+    main()