Could you give an example of a command that would generate this error? Thanks.

This issue occurs whenever there is no positional ("bareword") argument given to the program. For instance, with no arguments at all gitlab will hit it:

$ gitlab
Traceback (most recent call last):
  File "C:\Python34\Scripts\gitlab-script.py", line 9, in <module>
    load_entry_point('python-gitlab==0.9.1', 'console_scripts', 'gitlab')()
  File "C:\Python34\lib\site-packages\python_gitlab-0.9.1-py3.4.egg\gitlab\cli.py", line 275, in main
AttributeError: 'Namespace' object has no attribute 'action'

It will also occur if you provide option arguments, but still don't provide a positional argument (one that is not an option flag) as in gitlab -v:

$ gitlab -v
Traceback (most recent call last):
  File "C:\Python34\Scripts\gitlab-script.py", line 9, in <module>
    load_entry_point('python-gitlab==0.9.1', 'console_scripts', 'gitlab')()
  File "C:\Python34\lib\site-packages\python_gitlab-0.9.1-py3.4.egg\gitlab\cli.py", line 275, in main
AttributeError: 'Namespace' object has no attribute 'action'

This test was performed with the #78 (fix_python3_sort_types) fix applied -- otherwise Python 3 will fail earlier in the program before this point is reached.

I just push commit 7c38ef6 which should fix for this bug. It uses the argparse features instead of providing a custom test. Could you test it to make sure it behaves as you would expect? Thanks.

Verified fixed with commit 7c38ef6. Thanks.