              index = self._checkindex(index)
              self._check_allowed((val,))
              self._set_single(index, val)
  
      def __iter__(self):
          "Iterate over the items in the list"
          for i in range(len(self)):
              yield self[i]
  
      # ### Special methods for arithmetic operations ###
      def __add__(self, other):
          'add another list-like object'
          return self.__class__(list(self) + list(other))
  
 
</s> remove     _IndexError = IndexError
 </s> add  </s> remove         raise self._IndexError('invalid index: %s' % str(index))
 </s> add         raise IndexError('invalid index: %s' % str(index)) </s> remove             except self._IndexError:
 </s> add             except IndexError: </s> remove             except self._IndexError:
 </s> add             except IndexError: </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 
              index = self._checkindex(index)
              self._check_allowed((val,))
              self._set_single(index, val)
  





      # ### Special methods for arithmetic operations ###
      def __add__(self, other):
          'add another list-like object'
          return self.__class__(list(self) + list(other))
  
keep keep keep keep 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/mutable_list.py