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How to make a list of securities that == True.

I've made this simple algorithm that is supposed to scan for stocks that are up 10% from their previous close. I've gotten it to print out True or False as to whether the stock is up 10%, but now I want it to create a list of them so the I can tell the algo to only trade those select few for the day. I know this is probably simple, but I can't seem to figure it out. Any help is appreciated. Thanks!