Message 301314 - Python tracker

I'm thinking there are two aspects to this.  One would involve updates to PEP 7 to include a section on "Unreachable code".  The other would be a PR that updates the current C code to the PEP 7 standard.

I'll work on a PEP update as a separate PR, then we can discuss further on python-dev.  If the PEP changes are accepted, then we can manage the code changes as a PR against this issue.