Update fails with `global name 'version_str' is not defined`

[phihag]

When I try to update, I get the following error message:

Traceback (most recent call last):
  File "/usr/lib/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/usr/bin/youtube-dl/__main__.py", line 18, in <module>
  File "/usr/bin/youtube-dl/youtube_dl/__init__.py", line 774, in main
  File "/usr/bin/youtube-dl/youtube_dl/__init__.py", line 717, in _real_main
  File "/usr/bin/youtube-dl/youtube_dl/update.py", line 89, in update_self
NameError: global name 'version_str' is not defined

[phihag]

Unfortunately, there was a bug in version 2013.11.22.2. You can update manually by reinstalling. In most cases,

sudo curl https://yt-dl.org/latest/youtube-dl -o $(which youtube-dl)

should suffice.