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I thought the PEP actually covered it pretty well:
\- if you don't want to worry about name conflicts for every module, pick \*one\* short top level namespace for your group and use that
\- for shared modules, use the top level namespace with PyPI as the name registry

It's reasonable advice when coupled with the "avoid more than two levels of nesting - when tempted by this, split out some peer modules" elsewhere in the doc.