#NEWLINE# def __setitem__( self , key , data ) : #NEWLINE# #INDENT# if ( ( self . data is not None ) and ( key != self . data ) and ( key in self . versions ) ) : #NEWLINE# #INDENT# raise MutableAccessException #NEWLINE# #UNINDENT# self . versions . update ( { #NEWLINE# #INDENT# key : data , #NEWLINE# #UNINDENT# } ) #NEWLINE# self . data = key