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


 </s> add  </s> remove 
    class _IndexError:
        The type of exception to be raise on invalid index [Optional]
 </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     def __iter__(self):
        "Iterate over the items in the list"
        for i in range(len(self)):
            yield self[i]

 </s> add 
  
  class GEOSException(Exception):
      "The base GEOS exception, indicates a GEOS-related error."
      pass













keep keep keep keep replace replace replace replace replace replace replace replace replace replace replace replace replace
 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