[chaley]

Originally Posted by dunhill

I have modified the template to my options
program:

def do_one(ids, check_value, select_identifier):
if = select(ids, select_identifier);
if
!$#libreria==check_value && if
then
return list_difference(ids, strcat(select_identifier, if), ',')
fi;
return ids
fed;

ids = do_one($identifiers, "Amazon",'amazon');
ids = do_one(ids, "Cuspide", 'cuspide');
ids = do_one(ids, "Yenny", 'yenny');
ids = do_one(ids, "Baen", 'baen')

I have a column #libreria is the store where I buy the book
Usually Yenny
and in the identifiers cargo yenny:9789504968566

what I wanted is if in the store field it is Yenny just see the isbn of yenny

That template is incorrect. It uses a variable named 'if', which is a keyword. Here is a corrected version of the template. (Please use code tags for templates!)

program:
	def do_one(ids, check_value, select_identifier):
		sel = select(ids, select_identifier);
		if
			!$#libreria==check_value && sel
		then
			return list_difference(ids, strcat(select_identifier, sel), ',')
		fi;
		return ids
	fed;
	
	ids = do_one($identifiers, "Amazon",'amazon');
	ids = do_one(ids, "Cuspide", 'cuspide');
	ids = do_one(ids, "Yenny", 'yenny');
	ids = do_one(ids, "Baen", 'baen')

That said, I don't understand what this template is supposed to do. The function do_one() seems to do nothing if the check_value (the second parameter) equals the contents of #libreria. Said another way, it removes any identifier where the id name == the third parameter (select_identifier) and the store ($#libreria) does not equal to the second parameter (check_value). For example, the third call to do_one() does nothing if #libreria equals 'yenny', which from your text isn't what you want.

Sorry, but the complexity here is higher than I can cope with.