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Message: [QUOTE="Derrick 'dman' Hudson, post: 1739467"] This would be great for sets, if a set adequately models your data. (with two sets, this would simply be (s1-(s1&s2))) Did you want to define equality by key or by (key, value) pair? for key in domains_white.keys() : if key in domains_black: del domains_black[key] for key in domains_white.keys() : if key in domains_black and domains_white[key] == domains_black[key] : del domains_black[key] -D -- He who scorns instruction will pay for it, but he who respects a command is rewarded. Proverbs 13:13 www: [URL]http://dman13.dyndns.org/~dman/[/URL] jabber: [email]dman@dman13.dyndns.org[/email] [/QUOTE]