Ezio and Stephen, The "content" that you are brainstorming here is very helpful, and I'm learning new resources and detail from it. 

I've learned something from Ezio's link to Nick's post on python-committers. I'm not a core developer so I'm not subscribed to this list (kudos for the archives being public). When Stephen mentioned "if mailing list code of conduct is to be fleshed out" in msg247162, I was confused by the comment since I had not intended these tracker issues to be the place to develop a mailing list CoC. That's a bigger task :D and I want to stay focused on small, practical patches that are iterated over time.

[Note: A good takeaway from this is that there will be times that core developers believe that a topic has been extensively discussed i.e. mailing list CoC. Yet, the contributors without core developer status would not be aware that the topic has been extensively discussed unless they regularly read the python-committer archives.]

As a group, I think it would be helpful to step back for a moment and remind ourselves the improving mailing list communications will use a number of resources (FAQs, CoCs, devguide, helpful model messages, useful info from other projects, etc.).

As a next step on this issue, I will take the action item of editing 12.1 Mailing Lists to provide better description of each list's purpose. I will also draft section 12.4 Tips for effective online communication (more CPython focused than general). When I post the patch, I will also suggest updates that may be helpful to include in the communications section of the FAQ.

Thanks to each of you for caring about being welcoming and considerate to our community members and for lending your experience to improving the complex and fluid blob of communication between people.

P.S. Please keep your ideas and suggestions flowing. We can roll them over into new issues as we feel is helpful.