youtube-dl: --xattrs does not work on OS X.

• I’ve verified and I assure that I’m running youtube-dl 2016.04.01

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• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

Add -v flag to your command line you run youtube-dl with, copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

$ youtube-dl --write-auto-sub --sub-format srt --include-ads --console-title --newline --embed-subs --xattrs --add-metadata -v https://www.youtube.com/watch?v=Bfktt22nUG4
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'--write-auto-sub', u'--sub-format', u'srt', u'--include-ads', u'--console-title', u'--newline', u'--embed-subs', u'--xattrs', u'--add-metadata', u'-v', u'https://www.youtube.com/watch?v=Bfktt22nUG4']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2016.04.01
[debug] Python version 2.7.10 - Darwin-14.5.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 2.7.1, ffprobe 2.7.1
[debug] Proxy map: {}
[youtube] Bfktt22nUG4: Downloading webpage
[youtube] Bfktt22nUG4: Downloading video info webpage
[youtube] Bfktt22nUG4: Extracting video information
[youtube] Bfktt22nUG4: Looking for automatic captions
[youtube] Bfktt22nUG4: Downloading MPD manifest
WARNING: No subtitle format found matching "srt" for language en, using vtt
[info] Writing video subtitles to: iPhone SE (parody)-Bfktt22nUG4.en.vtt
WARNING: Requested formats are incompatible for merge and will be merged into mkv.
[download] iPhone SE (parody)-Bfktt22nUG4.mkv has already been downloaded and merged
[ffmpeg] Adding metadata to 'iPhone SE (parody)-Bfktt22nUG4.mkv'
[debug] ffmpeg command line: ffmpeg -y -i 'file:iPhone SE (parody)-Bfktt22nUG4.mkv' -c copy -metadata 'comment=Previous sketch: https://www.youtube.com/watch?v=--Fg3YbwG8E&index=1&list=PLiWL8lZPZ2_kafFTewyr06GuSPFd0m8hf

Help me make fun of everything! http://bit.ly/1A0Crdb
TWITTER: http://www.twitter.com/jacksfilms
FACEBOOK: http://www.facebook.com/jacksfilmsfans
LIVE CHAT every FRIDAY: http://www.younow.com/jacksfilms
SNAPCHAT: realjacksfilms
MERCH: http://www.jacksfilms.spreadshirt.com
PERISCOPE: http://www.periscope.tv/jacksfilms' -metadata 'description=Previous sketch: https://www.youtube.com/watch?v=--Fg3YbwG8E&index=1&list=PLiWL8lZPZ2_kafFTewyr06GuSPFd0m8hf

Help me make fun of everything! http://bit.ly/1A0Crdb
TWITTER: http://www.twitter.com/jacksfilms
FACEBOOK: http://www.facebook.com/jacksfilmsfans
LIVE CHAT every FRIDAY: http://www.younow.com/jacksfilms
SNAPCHAT: realjacksfilms
MERCH: http://www.jacksfilms.spreadshirt.com
PERISCOPE: http://www.periscope.tv/jacksfilms' -metadata artist=jacksfilms -metadata 'title=iPhone SE (parody)' -metadata date=20160321 -metadata 'purl=https://www.youtube.com/watch?v=Bfktt22nUG4' 'file:iPhone SE (parody)-Bfktt22nUG4.temp.mkv'
[ffmpeg] Embedding subtitles in 'iPhone SE (parody)-Bfktt22nUG4.mkv'
[debug] ffmpeg command line: ffmpeg -y -i 'file:iPhone SE (parody)-Bfktt22nUG4.mkv' -i 'file:iPhone SE (parody)-Bfktt22nUG4.en.vtt' -map 0 -c copy -map -0:s -map 1:0 -metadata:s:s:0 language=eng 'file:iPhone SE (parody)-Bfktt22nUG4.temp.mkv'
Deleting original file iPhone SE (parody)-Bfktt22nUG4.en.vtt (pass -k to keep)
[metadata] Writing metadata to file's xattrs
Traceback (most recent call last):
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/usr/local/bin/youtube-dl/__main__.py", line 19, in <module>
  File "/usr/local/bin/youtube-dl/youtube_dl/__init__.py", line 419, in main
  File "/usr/local/bin/youtube-dl/youtube_dl/__init__.py", line 409, in _real_main
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1725, in download
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 680, in extract_info
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 725, in process_ie_result
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1371, in process_video_result
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1707, in process_info
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1771, in post_process
  File "/usr/local/bin/youtube-dl/youtube_dl/postprocessor/xattrpp.py", line 158, in run
  File "/usr/local/bin/youtube-dl/youtube_dl/postprocessor/xattrpp.py", line 72, in write_xattr
AttributeError: 'module' object has no attribute 'set'

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Description of your issue, suggested solution and other information

I attempted to download a video and I wanted to use the -xattrs flag, but the above error came up. The file does not appear on my computer. I do not know what other description or information to provide, if any, but if you need me to supply more information I will do my best to do so.