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def __init__(self,data):
self.data=data
self.next=None
class Linked_list:
def __init__(self):
self.head=None
self.p=None
def insert_start(self,data):
new=Node(data)
new.next=self.head
self.head=new
def insert_end(self,data):
new=Node(data)
if self.head == None:
self.head=new
self.p=new
else:
self.p.next=new
self.p=self.p.next
def insert_aft(self,data,e):
new=Node(data)
self.p=self.head
while self.p.data!=e:
self.p=self.p.next
new.next=self.p.next
self.p.next=new
def insert_bef(self,data,e):
new=Node(data)
self.p=self.head
while self.p.next.data!=e:
self.p=self.p.next
new.next=self.p.next
self.p.next=new
def traverse(self):
self.p=self.head
while self.p!=None:
print(f"n{self.p.data}")
self.p=self.p.next
def nodecnt(self):
self.p=self.head
self.cnt=0
while self.p!=None:
self.cnt+=1
self.p=self.p.next
print(f"nNo. of nodes:{self.cnt}")
def search(self,e):
self.p=self.head
self.c=1
while self.p.data!=e:
self.p=self.p.next
self.c+=1
print(f"Found at:{self.c}")
l=Linked_list()
while True:
a=input("Enter 1 for appendn2 for insert at startn3 for traversen4 for countn5 for insert after elementn6 for insert before elementn7 for exitn")
if a=='1':
n=int(input("Enter data:n"))
l.insert_end(n)
elif a=='2':
n=int(input("Enter data:n"))
l.insert_start(n)
elif a=='3':
l.traverse()
elif a=='4':
l.nodecnt()
elif a=='5':
e=int(input("Enter the element:n"))
n=int(input("Enter data:n"))
l.insert_aft(n,e)
elif a=='6':
e=int(input("Enter the element:n"))
n=int(input("Enter data:n"))
l.insert_bef(n,e)
elif a=='7':
break
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