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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.