Issue #1397 (#1403)

Author: ManuMBhat

data_structures/linked_list/singly_linked_list.py

@@ -6,56 +6,56 @@ def __init__(self, data):
 
 class Linked_List:
     def __init__(self):
-        self.Head = None  # Initialize Head to None
+        self.head = None  # Initialize head to None
 
     def insert_tail(self, data):
-        if self.Head is None:
+        if self.head is None:
             self.insert_head(data)  # If this is first node, call insert_head
         else:
-            temp = self.Head
+            temp = self.head
             while temp.next != None:  # traverse to last node
                 temp = temp.next
             temp.next = Node(data)  # create node & link to tail
 
     def insert_head(self, data):
         newNod = Node(data)  # create a new node
-        if self.Head != None:
-            newNod.next = self.Head  # link newNode to head
-        self.Head = newNod  # make NewNode as Head
+        if self.head != None:
+            newNod.next = self.head  # link newNode to head
+        self.head = newNod  # make NewNode as head
 
     def printList(self):  # print every node data
-        tamp = self.Head
-        while tamp is not None:
-            print(tamp.data)
-            tamp = tamp.next
+        temp = self.head
+        while temp is not None:
+            print(temp.data)
+            temp = temp.next
 
     def delete_head(self):  # delete from head
-        temp = self.Head
-        if self.Head != None:
-            self.Head = self.Head.next
+        temp = self.head
+        if self.head != None:
+            self.head = self.head.next
             temp.next = None
         return temp
 
     def delete_tail(self):  # delete from tail
-        tamp = self.Head
-        if self.Head != None:
-            if self.Head.next is None:  # if Head is the only Node in the Linked List
-                self.Head = None
+        temp = self.head
+        if self.head != None:
+            if self.head.next is None:  # if head is the only Node in the Linked List
+                self.head = None
             else:
-                while tamp.next.next is not None:  # find the 2nd last element
-                    tamp = tamp.next
-                tamp.next, tamp = (
+                while temp.next.next is not None:  # find the 2nd last element
+                    temp = temp.next
+                temp.next, temp = (
                     None,
-                    tamp.next,
-                )  # (2nd last element).next = None and tamp = last element
-        return tamp
+                    temp.next,
+                )  # (2nd last element).next = None and temp = last element
+        return temp
 
     def isEmpty(self):
-        return self.Head is None  # Return if Head is none
+        return self.head is None  # Return if head is none
 
     def reverse(self):
         prev = None
-        current = self.Head
+        current = self.head
 
         while current:
             # Store the current node's next node.
@@ -67,15 +67,15 @@ def reverse(self):
             # Make the current node the next node (to progress iteration)
             current = next_node
         # Return prev in order to put the head at the end
-        self.Head = prev
+        self.head = prev
 
 
 def main():
     A = Linked_List()
-    print("Inserting 1st at Head")
+    print("Inserting 1st at head")
     a1 = input()
     A.insert_head(a1)
-    print("Inserting 2nd at Head")
+    print("Inserting 2nd at head")
     a2 = input()
     A.insert_head(a2)
     print("\nPrint List : ")
@@ -88,7 +88,7 @@ def main():
     A.insert_tail(a4)
     print("\nPrint List : ")
     A.printList()
-    print("\nDelete Head")
+    print("\nDelete head")
     A.delete_head()
     print("Delete Tail")
     A.delete_tail()