old_contents: # -*- coding: utf-8 -*-
  #------------------------------------------------------------------------------
  #  Package: Pikos toolkit
  #  File: filters/on_value.py
  #  License: LICENSE.TXT
  #
  #  Copyright (c) 2012, Enthought, Inc.
  #  All rights reserved.
  #------------------------------------------------------------------------------
  
  
  class OnValue(object):
      """ A record filter that remove the record when a value is not contained.
  
      Attributes
      ----------
      field : str
          The field to check for change.
  
      values :
          A list of values to use for the filtering.
  
      Notes
      -----
      This filter only works with nametuple like records.
  
      """
      def __init__(self, field, *args):
          """ Initialize the filter class.
  
          Parameters
          ----------
          field : str
              The field to check for change
  
          *args :
              A list of values to look for.
  
          """
          self.field = field
          self.values = list(args)
  
      def __call__(self, record):
          """ Check for the value in the field.
          """
          value = getattr(record, self.field)
          return value in self.values
  
new_contents: # -*- coding: utf-8 -*-
  #------------------------------------------------------------------------------
  #  Package: Pikos toolkit
  #  File: filters/on_value.py
  #  License: LICENSE.TXT
  #
  #  Copyright (c) 2012, Enthought, Inc.
  #  All rights reserved.
  #------------------------------------------------------------------------------
  
  
  class OnValue(object):
      """ A record filter that returns True if record has a specific value.
  
      Attributes
      ----------
      field : str
          The field to check for change.
  
      values :
          A list of values to use for the filtering.
  
      Notes
      -----
      This filter only works with nametuple like records.
  
      """
      def __init__(self, field, *args):
          """ Initialize the filter class.
  
          Parameters
          ----------
          field : str
              The field to check for change
  
          *args :
              A list of values to look for.
  
          """
          self.field = field
          self.values = list(args)
  
      def __call__(self, record):
          """ Check for the value in the field.
          """
          value = getattr(record, self.field)
          return value in self.values
  
subject: fix docstring