How can I create a linked list in Python?

[Dongsheng Ruan]

with a cell class like this:

#!/usr/bin/python

import sys

class Cell:

 def __init__( self, data, next=None ):
  self.data = data
  self.next = next

 def __str__( self ):
  return str( self.data )

 def echo( self ):
  print self.__str__() 


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