Edits to Day-Trading Algorithm

I like the algo discussed on medium here

As I’m learning Python, I’m looking for help on with selecting the universe of tickers:
I’m focused on 10 to 20 tickers, which I’d like to key into the code, rather than get_tickers() seek tickers that fit parameters from all available tickers
Can you provide revised code for this function? e.g. tickers = SPY,QQQ, etc.