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Using pipeline to select securities based on today's price

Hi all,

I was wondering is there a way to use pipeline stock selection to include today's market price. The tutorials point to use pipeline_output in the before_start_trading function. Then in that case we cannot use todays market price in security selection criteria, like price after market open with yesterdays close price.

Is there a workaround for this ?

@Admin: What would happen if we use the pipeline_output in a schedule function ?