[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

data_structures/linked_list/add_node.py

@@ -1,7 +1,7 @@
 class node: #define a class named node having data and ref as attributes
     def __init__(self,data):
-        self.data=data 
-        self.ref= None 
+        self.data=data
+        self.ref= None
 class LinkedList:
     def __init__(self): #define head of the linked list i.e initiate the linked list
         self.head=None
@@ -13,10 +13,10 @@ def print_LL(self): # to print the linked list
             while n is n ot None:
                 print(n.data)
                 n=n.ref
-    def add_begin(self,data): #to add a node in the beginning 
+    def add_begin(self,data): #to add a node in the beginning
         new_node= node(data) #define data of the new node
         new_node.ref= self.head #make the ref or adress of node to the head node
-        self.head = new_node 
+        self.head = new_node
     def add_end(self,data):
         new_node= node(data)
         if self.head is None:
@@ -34,11 +34,11 @@ def add_after(self,data,x):
             n=n.ref
         new_node=node(data)
         new_node.ref= n.ref
-        n.ref= new_node 
+        n.ref= new_node
 linked_list= LinkedList() # main driver function here we define the linked list
 linked_list.add_begin(11) #added 11 to the beginning of out linked list
 linked_list.add_end(100)
 linked_list.add_begin(22)
 linked_list.add_after(30,11)
 linked_list.print_LL()
-#https://youtu.be/xRTdfZsAz6Y?si=EMrqVJpXjDDz1kEF
+#https://youtu.be/xRTdfZsAz6Y?si=EMrqVJpXjDDz1kEF