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From: Peter Otten <__peter__@web.de>
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Subject: Re: Trouble porting glob bash behavior with argparse to windows shell
Date: Tue, 03 May 2016 23:15:45 +0200
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Xref: csiph.com comp.lang.python:108100

Sayth Renshaw wrote:

> Is there something obvious to this I am doing wrong?

>     parser.add_argument("path", nargs="+") 
 
The "+" implicitly turns args.path into a list

>     files |= set(glob.glob(args.path + '/*' + args.extension))

so the glob() argument is evaluated as

list + str + str

Try

name_pattern = "*" + args.extension
for path in args.path:
    files.update(glob.glob(os.path.join(path, name_pattern)))