#NEWLINE# def has_changed( self , initial , data ) : #NEWLINE# #INDENT# if ( ( ( initial is None ) and ( data is not None ) ) or ( ( obj is not None ) and ( data is None ) ) ) : #NEWLINE# #INDENT# return True #NEWLINE# #UNINDENT# obj = super ( NullableField , self ) #NEWLINE# if hasattr ( obj , 'has_changed' ) : #NEWLINE# #INDENT# return obj . has_changed ( initial , data ) #NEWLINE# #UNINDENT# else : #NEWLINE# #INDENT# return obj . _has_changed ( initial , data )