Added circularlinkedlist.py

lists/circularlinkedlist.py

@@ -0,0 +1,52 @@
+class Node:
+
+    # Constructor to create  a new node 
+    def __init__(self, data):
+        self.data = data 
+        self.next = None
+
+class CircularLinkedList:
+
+    # Constructor to create a empty circular linked list 
+    def __init__(self):
+        self.head = None
+
+    # Function to insert a node at the beginning of a 
+    # circular linked list
+    def push(self, data):
+        ptr1 = Node(data)
+        temp = self.head
+        ptr1.next = self.head
+
+        # If linked list is not None then set the next of
+        # last node
+        if self.head is not None:
+            while(temp.next != self.head):
+                temp = temp.next
+            temp.next = ptr1  
+        else: 
+            ptr1.next = ptr1 # For the first node 
+
+        self.head = ptr1
+
+    # Function to print nodes in a given circular linked list
+    def printList(self):
+        temp = self.head
+        if self.head is not None:
+            while(True):
+                print "%d" %(temp.data),
+                temp = temp.next
+                if (temp == self.head):
+                    break
+
+# Driver program to test above function 
+if __name__ == "__main__": 
+    # Initialize list as empty 
+    cllist = CircularLinkedList() 
+    # Created linked list will be 11->2->56->12 
+    cllist.push(12)
+    cllist.push(56)
+    cllist.push(2)
+    cllist.push(11)
+    print "Contents of circular Linked List"
+    cllist.printList()