Why do we use underscore "_" in this python function using django?

_, filenames = default_storage.listdir("entries")
return list(sorted(re.sub(r"\.md$", "", filename)
        for filename in filenames if filename.endswith(".md")))

So here is a function that returns a list of names. I am trying to understand how this function works but I don't understand what that underscore at the beginning is doing there. Thank you!

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