old_contents: """Creates a pseudo-package called `tvtk` that lets one use the tvtk
  classes in a clean and quick manner.  The `TVTK` class is instantiated
  and this instance serves as the `tvtk` 'module'.  For more details on
  this see the devel.txt in the TVTK documentation directory.
  """
  # Author: Prabhu Ramachandran <prabhu [at] aero.iitb.ac.in>
  # Copyright (c) 2007-2008,  Enthought, Inc.
  # License: BSD Style.
  
  
  from os.path import exists, join, dirname, isdir
  import sys
  
  # The tvtk wrapper code is all typically inside one zip file.  We try to
  # find this file and put it in sys.path and then create the 'tvtk'
  # module wrapper from that.  If the ZIP file is extracted into a
  # tvtk_classes directory the ZIP file is not used and the tvtk_classes
  # directory is inserted into sys.path and the directory contents are
  # used for the tvtk classes -- note that you must have the following
  # structure tvtk_classes/tvtk_classes/__init__.py.  This is handy for
  # tools like pydev (Eclipse). If neither the tvtk_classes directory or
  # the zip file is found an error is raised.
  
  _zip = join(dirname(__file__), 'tvtk_classes.zip')
  tvtk_class_dir = join(dirname(__file__), 'tvtk_classes')
  
  if exists(tvtk_class_dir) and isdir(tvtk_class_dir):
      sys.path.append(tvtk_class_dir)
  elif exists(_zip) and _zip not in sys.path:
      sys.path.append(_zip)
  else:
      msg = """TVTK not built properly.  Unable to find
            either a directory: %s 
            or a file: %s
            with the TVTK classes."""%(tvtk_class_dir, _zip)
      raise ImportError(msg)
  
  # Check if the VTK version is the same as that used to build TVTK.
  from tvtk_classes.vtk_version import vtk_build_version
  
  # Make sure VTK is installed.
  try:
      import vtk
  except ImportError, m:
      msg = '%s\n%s\nDo you have vtk installed properly?\n' \
            'VTK (and build instructions) can be obtained from http://www.vtk.org\n' \
           % (m, '_'*80)
      raise ImportError(msg)
  
  vtk_version = vtk.vtkVersion().GetVTKVersion()[:3]
  if vtk_version != vtk_build_version:
      msg = '*'*80 + "\n" + \
            'WARNING: Imported VTK version (%s) does not match the one used\n'\
            '         to build the TVTK classes (%s). This may cause problems.\n'\
            '         Please rebuild TVTK.\n'%(vtk_version, vtk_build_version) +\
            '*'*80 + '\n'
      print msg
  
  # Now setup TVTK itself.
  from tvtk_classes import tvtk_helper
  tvtk = tvtk_helper.TVTK()
  
  
new_contents: """Creates a pseudo-package called `tvtk` that lets one use the tvtk
  classes in a clean and quick manner.  The `TVTK` class is instantiated
  and this instance serves as the `tvtk` 'module'.  For more details on
  this see the devel.txt in the TVTK documentation directory.
  """
  # Author: Prabhu Ramachandran <prabhu [at] aero.iitb.ac.in>
  # Copyright (c) 2007-2008,  Enthought, Inc.
  # License: BSD Style.
  
  
  from os.path import exists, join, dirname, isdir
  import sys
  
  # The tvtk wrapper code is all typically inside one zip file.  We try to
  # find this file and put it in sys.path and then create the 'tvtk'
  # module wrapper from that.  If the ZIP file is extracted into a
  # tvtk_classes directory the ZIP file is not used and the tvtk_classes
  # directory is inserted into sys.path and the directory contents are
  # used for the tvtk classes -- note that you must have the following
  # structure tvtk_classes/tvtk_classes/__init__.py.  This is handy for
  # tools like pydev (Eclipse). If neither the tvtk_classes directory or
  # the zip file is found an error is raised.
  
  _zip = join(dirname(__file__), 'tvtk_classes.zip')
  tvtk_class_dir = join(dirname(__file__), 'tvtk_classes')
  
  if exists(tvtk_class_dir) and isdir(tvtk_class_dir):
      sys.path.append(tvtk_class_dir)
  elif exists(_zip):
      if _zip not in sys.path:
          sys.path.append(_zip)
  else:
      raise ImportError("TVTK not built properly. " 
          "Unable to find either a directory: %s or a file: %s "
          "with the TVTK classes." % (tvtk_class_dir, _zip) )
  
  # Check if the VTK version is the same as that used to build TVTK.
  from tvtk_classes.vtk_version import vtk_build_version
  
  # Make sure VTK is installed.
  try:
      import vtk
  except ImportError, m:
      msg = '%s\n%s\nDo you have vtk installed properly?\n' \
            'VTK (and build instructions) can be obtained from http://www.vtk.org\n' \
           % (m, '_'*80)
      raise ImportError(msg)
  
  vtk_version = vtk.vtkVersion().GetVTKVersion()[:3]
  if vtk_version != vtk_build_version:
      msg = '*'*80 + "\n" + \
            'WARNING: Imported VTK version (%s) does not match the one used\n'\
            '         to build the TVTK classes (%s). This may cause problems.\n'\
            '         Please rebuild TVTK.\n'%(vtk_version, vtk_build_version) +\
            '*'*80 + '\n'
      print msg
  
  # Now setup TVTK itself.
  from tvtk_classes import tvtk_helper
  tvtk = tvtk_helper.TVTK()
  
  
subject: Fix a bug in tvtk.py, in the loading of tvtk classes generated code, when the path is not in the sys.path.