(self, index, value)
Add an error to the tree at the given ``index``.
Add an error to the tree at the given ``index``.
Add an error to the tree at the given index .
def __setitem__(self, index, value):
        """
        Add an error to the tree at the given ``index``.
        """
        self._contents[index] = value
def __setitem__ ( self , index , value ) : self . _contents [ index ] = value