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Having the same issue when the doc example code as pawelmhm above. Here is a 'pip freeze' output dump. Using python 3.4.3 in ubuntu 14.04. Brlapi==0.6.1 CherryPy==8.1.0 Magic-file-extensions==0.2 Mako==0.9.1 MarkupSafe==0.18...

Additionally, consistently get the following error when trying another example from the doc: Python 3.4.3 (default, Sep 14 2016, 12:36:27) [GCC 4.8.4] on linux Type "help", "copyright", "credits" or "license"...