An interesting 20-min talk introducing some of the tools available to analyze and report on your Python code base. Carl Crowder gave this talk at Europython 2014, you can find the slides and some pointers on his Web page.
One of the tools Carl created himself is landscape.io which let's you automate code reviews for your GitHub repositories. It is free for open source projects and I liked what I saw in my first test drive.
Below you can see a screenshot of the error messages view for the Logya project on landscape.
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