apilar usando un ejemplo de código de Python de lista enlazada individualmente

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Ejemplo: use una lista enlazada individualmente cree una pila de python

'''Python supports automatic garbage collection so deallocation of memory 
is done implicitly. However to force it to deallocate each node after use, 
add the following code: 
  
    import gc         #added at the start of program 
    gc.collect()     #to be added wherever memory is to be deallocated 
'''classNode:# Class to create nodes of linked list # constructor initializes node automatically def__init__(self,data): 
        self.data = data 
        self.next=NoneclassStack:# head is default NULL def__init__(self): 
        self.head =None# Checks if stack is empty defisempty(self):if self.head ==None:returnTrueelse:returnFalse# Method to add data to the stack # adds to the start of the stack defpush(self,data):if self.head ==None: 
            self.head=Node(data)else: 
            newnode = Node(data) 
            newnode.next= self.head 
            self.head = newnode 
      
    # Remove element that is the current head (start of the stack) defpop(self):if self.isempty():returnNoneelse:# Removes the head node and makes  #the preceeding one the new head 
            poppednode = self.head 
            self.head = self.head.next
            poppednode.next=Nonereturn poppednode.data 
      
    # Returns the head node data defpeek(self):if self.isempty():returnNoneelse:return self.head.data 
      
    # Prints out the stack      defdisplay(self): 
          
        iternode = self.head 
        if self.isempty():print("Stack Underflow")else:while(iternode !=None):print(iternode.data,"->",end =" ") 
                iternode = iternode.nextreturn# Driver code 
MyStack = Stack() 
  
MyStack.push(11)  
MyStack.push(22) 
MyStack.push(33) 
MyStack.push(44)# Display stack elements  
MyStack.display()# Print top element of stack  print("nTop element is ",MyStack.peek())# Delete top elements of stack  
MyStack.pop() 
MyStack.pop()# Display stack elements 
MyStack.display()# Print top element of stack  print("nTop element is ", MyStack.peek())# This code is contributed by Mathew George

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