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In Python-3* it used to show the following:
Traceback (most recent call last):
File "/usr/lib/python-exec/python3.3/powerline-config", line 66, in <module>
args.function(pl, args)
AttributeError: 'Namespace' object has no attribute 'function'
now it shows
usage: powerline-config [-h] {tmux,shell} ...
powerline-config: error: too few arguments
in both python-2.7 and -3.3.
Fixes #1120.