Getting FileExistsError occasionally about filelock

[rogerdahl]

I'm just trying out the filelock module myself. In your function, what happens if a file that would have triggered the check that raises OSError() is created elsewhere between the check and the open()?

[berkowitze]

The function halts after the raise, so wherever that problematic locked_file was called will fail as well.
If the file is removed between the check and the open, that's more problematic you'll get a hanging lock file and not sure if it gets released. In my application, files aren't really removed so I'm not concerned about this personally.

[Zooce]

Looking at the code, in UnixFileLock._acquire the call to os.open is not wrapped in a try-except, but WindowsFileLock._acquire does wrap the os.open call in a try-except.

[gaborbernat]

Hello, if you make a PR for this (with tests) we would be happy to review it, thanks!