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From #740, Python 2 is no longer supported. This line
python update_plugins.py # use python3 if python is unavailable
makes it sound like this script still supports Python 2. So aPython 3 is required.
statement clears up that ambiguity.The current update_plugins.py script will not run on Python 2 because of the use of urllib.request.urlopen (Python 2 uses urllib2 module for the urlopen method), and in Python 2, urllib2.urlopen needs contextlib.closing to be used in a
with
clause.