Add singly linked lists for python (#116)

* fixed incorrect links

* added singly list Data structure

* removed semi-column

linked-lists/Python/singly.py

@@ -0,0 +1,58 @@
+# A simple Python program to create a singly linked list 
+  
+# Node class 
+class Node: 
+  
+    # Function to initialise the node object 
+    def __init__(self, data): 
+        self.data = data  # Assign data 
+        self.next = None  # Initialize next as null 
+  
+  
+# Linked List class contains a Node object 
+class LinkedList: 
+  
+    # Function to initialize head 
+    def __init__(self): 
+        self.head = None
+
+    
+    # Function to insert a new node at the beginning 
+    def insertAtHead(self, new_data): 
+    
+        # 1 & 2: Allocate the Node & 
+        #        Put in the data 
+        new_node = Node(new_data) 
+            
+        # 3. Make next of new Node as head 
+        new_node.next = self.head 
+            
+        # 4. Move the head to point to new Node  
+        self.head = new_node 
+    def removeAtHead(self):
+        temp = self.head 
+ 
+        # If head node itself holds the key to be deleted 
+        if (temp is not None): 
+            self.head = temp.next
+            temp = None
+            return
+        else:
+            return('underflow')
+    def printList(self): 
+        temp = self.head 
+        while(temp): 
+            print (temp.data)
+            temp = temp.next
+
+  
+  
+# Code execution starts here 
+if __name__=='__main__':
+    l=LinkedList()
+    l.insertAtHead(1)
+    l.insertAtHead('xyz')
+    l.insertAtHead(1.1)
+    l.removeAtHead()
+    l.printList()
+

linked-lists/README.md

@@ -11,8 +11,11 @@
 
 ### Java
 
-1. [Singly Linked List](java/singly.cpp)
+1. [Singly Linked List](java/singly.java)
 
-### Java
+### JavaScript
 
-1. [Singly Linked List](js/singly.cpp)
+1. [Singly Linked List](js/singly.js)
+
+### Python
+1. [Singly Linked List](Python/singly.py)