stack.py

class Node:
    def __init__(self,value):
        self.value = value
        self.next = None

class stack:
    def __init__(self,value):
        new_node = Node(value)
        self.top = new_node
        self.height=+1

    def push(self,value):
        new_node=Node(value)
        if self.height==0:
            self.top=new_node
        else:
            new_node.next=self.top
            self.top=new_node
        self.height=+1

    def pop(self):
        if self.height==0:
            return None
        temp = self.top
        self.top=self.top.next
        temp.next = None
        self.height-=1
        return temp

    def print(self):
        temp = self.top
        while temp is not None:
            print(temp.value)
            temp=temp.next

my_stack = stack(4)
my_stack.push(5)
my_stack.pop()
my_stack.print()