  """
  This module contains a base type which provides list-style mutations
  without specific data storage methods.
  
  See also http://www.aryehleib.com/MutableLists.html
  
  Author: Aryeh Leib Taurog.
  """
  from functools import total_ordering
  
 
</s> remove """
 This module houses the GEOS exceptions, specifically, GEOSException and
 GEOSGeometryIndexError.
"""


 </s> add  </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 from .error import GEOSException, GEOSIndexError  # NOQA
 </s> add from .error import GEOSException  # NOQA </s> remove 
    class _IndexError:
        The type of exception to be raise on invalid index [Optional]
 </s> add 
See also http://static.aryehleib.com/oldsite/MutableLists.html
  """
  This module contains a base type which provides list-style mutations
  without specific data storage methods.
  
See also http://static.aryehleib.com/oldsite/MutableLists.html
  
  Author: Aryeh Leib Taurog.
  """
  from functools import total_ordering
  
keep keep keep keep 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/mutable_list.py