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linked list.py
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linked list.py
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import sys
class Node:
def __init__(self,value):
self.value = value
self.next = None
class LinkedList:
def __init__(self):
self.top = None
self.current = None
def add(self,value):
obj = Node(value)
if self.top == None:
self.top = obj
self.current = obj
else:
if self.top.next == None:
self.top.next == obj
self.current.next = obj
self.current = obj
def delete(self,value):
temp = self.top
previous = None
while(temp != None):
if temp.value == value:
if previous != None:
previous.next = temp.next
else:
self.top = temp.next
if self.current.value == value:
self.current = previous
return
previous = temp
temp= temp.next
print("Element not found")
def insert(self,value,before):
temp = self.top
while(temp != None):
obj = Node(value)
if temp.value == before:
obj.next = temp.next
temp.next = obj
if obj.next == None:
self.current = obj
return
temp = temp.next
print("Element not found")
def show(self):
temp = self.top
while temp != None:
print(temp.value)
temp=temp.next
print("------------------------------------")
if __name__ == '__main__':
print(sys.executable)
l = LinkedList()
l.add(5)
l.add(3)
l.add(4)
l.show()
l.delete(4)
l.delete(5)
l.show()
l.add(5)
l.show()
l.add(8)
l.show()
l.insert(4,8)
l.show()