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This issue was closed, but I believe the original bug reported was not fixed: trying to create a temporary file in a directory where you don't have write permissions hangs for a long time before failing with a misleading FileExistsError, rather than failing immediately with PermissionError.
I've just run into this on Python 3.5.1 while trying to use tempfile to check if a directory is writable - which I'm doing precisely because os.access() isn't useful on Windows!
I find it hard to believe that there is no way to distinguish a failure because the name is already used for a subdirectory from a failure because we don't have permission to create a file.