Q:

In python, how can I check if a filename ends in '.html' or '_files'?

In python, how can I check if a filename ends in '.html' or '_files'?

A:

You probably want to know if a file name ends in these strings, not the file istelf:
if file_name.endswith((".html", "_files")):
    # whatever

To test whether a file ends in one of these strings, you can do this:
with open(file_name) as f:
    f.seek(-6, 2)           # only read the last 6 characters of the file
    if f.read().endswith((".html", "_files")):
        # whatever

