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Plotting Pipeline Pandas DataFrame results

Dear all,

First off, Happy New and Prosperous Year!

Second, I am new in Pipeline and Pandas. Attached is my Notebook where I apply pipeline to get % of gap values for common stocks ((previous day close - current day open)/previous day close) for a certain day range.

Now I need to

(1) loop through days to calculate lengths of outputs for each day (number of gapped stocks for a given trading day)

(2) plot the lengths (number of gapped stocks for a given trading day, on Y axis) vs DataFrame Index i.e.trading days (on X axis)

How could I do that using the pipeline output? Since it is a Pandas DataFrame there should be general methods applied to any pandas data frames. Many thanks.