linkedlist

class node:
    def __init__(self,data):
        self.data=data
        self.next=None
class linkedlist(node):
    def __init__(self):
        self.head=None
        self.next=None
    def push(self,data):
        node=node(data)
        node.next=self.head
        self.head=node
    def printlist(self):
        curnode=self.head
        while curnode!=None:
            print(curnode.data)
            curnode=curnode.next
    def append(self,data):
        node=node(data)
        curnode=self.head
        if curnode==None:
            self.head=node
            return
        while curnode.next!=None:
            curnode=curnode.next
        curnode.next=node
    def insertafter(self,prev,data):
        node=node(data)
        if prev==None:
            print("given node must be in linked list")
            return
        curnode=prev.next
        prev.next=node
        node.next=curnode
l=linkedlist()
l.push(5)
l.append(10)
l.push(15)
l.printlist()