Simple linked list in Python

linkedlist.rb

# Author: Ivan E. Cao-Berg (icaoberg@cmu.edu)
#
# Copyright (C) 2012
# School of Computer Science
# Carnegie Mellon University
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published
# by the Free Software Foundation; either version 2 of the License,
# or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
#
# For additional information visit http://www.andrew.cmu.edu/~icaoberg or
# send email to icaoberg@cmu.edu


class LinkedList
  def initialize()
     @list = []
  end
  
  def append( value = nil )
     begin
        @list.push( value )
        return true
     rescue
        return false
     end
  end
  
  def prepend( value = nil )
     begin
         @list.unshift( value )
         return true
     rescue
         return false
     end
  end
  
  def has( value = nil )
     return @list.include?(value)
  end
  
  def get( index )
     begin
         return @list.at( index )
     rescue
         return nil
     end
  end

  def size()
      return @list.size
  end
  
  def remove()
     begin
        @list.shift()
        return true
     rescue
        return false
     end
  end
  
  def head()
     return @list.first
  end

  def tail()
     return @list.last
  end
  
  def toArray()
     return @list
  end
  
  def toString()
     print "[" + @list.join(",") + "]"
  end
end