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@serhiy-storchaka: please review the changes made to this pull request.

It looks like we don't have a test for fwalk(top=fd) where fd would be a valid fd obj that fwalk() can successfully use. It might be nice to add a test for that because the current test would logically build on top of that, as a non-int obj implementing __index__ is meant to be usable as an fd, as implied by current code (and I assume that would actually work).

@akulakov thanks for review.
You suggest to rewrite logic of test? sorry didn't understand. Can you please provide more information?

@serhiy-storchaka. Can you please review too?

@AliyevH fwalk doesn't seem to be working for valid fd in my testing:

[ins] In [69]: fw=os.fwalk(fd, follow_symlinks=True)

[ins] In [70]: list(fw)

TypeError: open: path should be string, bytes or os.PathLike, not int

I confirm that fwalk() does not support integer first argument, and never supported (this is why there are no tests). The check is misleading and should be removed.