Formatting problem solved

[ UPDATE: So I discovered that the line breaks setting below seems to be retroactive, and changing it messes up the old posts. Another solution is to substitute newlines in the code with <br /> tags. That's what I've done here, and seems OK. This makes it difficult to actually edit code samples in the editor, but them's the breaks. :) ]

On the topic of how to format code samples for the blog, I've been doing some testing and found that the combination of

Settings > Formatting
section: Convert line breaks
No

and

Settings > Basic
section: Global > Select post editor
Updated editor

appears to have solved the problems that cropped up (my post here) with my standard approach using <table>. A sample:

def f(n): print "Hello world!"