  """
   This module houses the GEOS exceptions, specifically, GEOSException and
   GEOSGeometryIndexError.
  """
  
  
  class GEOSException(Exception):
      "The base GEOS exception, indicates a GEOS-related error."
      pass
  
  
 
</s> remove 

class GEOSIndexError(GEOSException, KeyError):
    """
    This exception is raised when an invalid index is encountered, and has
    the 'silent_variable_feature' attribute set to true.  This ensures that
    django's templates proceed to use the next lookup type gracefully when
    an Exception is raised.  Fixes ticket #4740.
    """
    # "If, during the method lookup, a method raises an exception, the exception
    #  will be propagated, unless the exception has an attribute
    #  `silent_variable_failure` whose value is True." -- Django template docs.
    silent_variable_failure = True
 </s> add  </s> remove See also http://www.aryehleib.com/MutableLists.html
 </s> add See also http://static.aryehleib.com/oldsite/MutableLists.html </s> remove     # Raise GEOSIndexError instead of plain IndexError
    # (see ticket #4740 and GEOSIndexError docstring)
    _IndexError = GEOSIndexError
 </s> add  </s> remove             raise GEOSIndexError('invalid GEOS Geometry index: %s' % str(index))
 </s> add             raise IndexError('invalid GEOS Geometry index: %s' % str(index)) </s> remove 
    class _IndexError:
        The type of exception to be raise on invalid index [Optional]
 </s> add 






  class GEOSException(Exception):
      "The base GEOS exception, indicates a GEOS-related error."
      pass
  
  
replace replace replace replace replace replace keep keep keep keep keep
 Fixed #25225 -- Simplified code to remove GEOSIndexError

The test is a regression for refs #4740 to show that the original
fix of GEOSIndexError is no longer needed. 
django/contrib/gis/geos/error.py