Comparing Barcodes Between 2 Files?

From: Kyle Breneman <tomeconqueror_at_nyob> Date: Fri, 10 Nov 2017 16:16:23 -0500 To: CODE4LIB_at_LISTS.CLIR.ORG

I have 2 Excel files, each with a column of barcodes.  I am supposed to
determine which, if any, of the barcodes in the first file are also present
in the second file.  Is writing a short Python program the best way to do
this, or is there a more efficient way?  (There are about 300 items in the
first file and about 1,000 items in the second file.)

Regards,
Kyle