I was recently hunting down a bug that ended up being caused by a change in packaging, like so: Before: nevow/ formless.py After: nevow/ formless/ I upgraded with a 'setup.py install' - this installed the new code, but didn't remove the old module. This caused brokenness, because inside nevow, 'import formless' got the old code. I don't think we want to be destroying files that are also in the newly-installed package's directory, but I _do_ think we should at least warn about them. If this seems like a good idea, I'll whip up a patch. Any other opinions? -- Anthony Baxter It's never too late to have a happy childhood.