#NEWLINE# def __add__( self , other ) : #NEWLINE# #INDENT# if ( not isinstance ( other , Tags ) ) : #NEWLINE# #INDENT# raise TypeError ( 'Tags can only be added with tags' ) #NEWLINE# #UNINDENT# tags = Tags ( 'Tags' ) #NEWLINE# tags . value = ( ( self . value or [ ] ) + ( other . value or [ ] ) ) #NEWLINE# return tags