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I just read the docs on this, but don't really grok the pros-and-cons. Can you give an example of a gotcha? That would be very helpful.

Namespaces are useful for library providers and os packagers to split sub features of one package and distribute the chunks separately.

It will virtually merge dirs with the same name under some circonstances, and won't be importable in some others. You also lose the benefit of having an init file in which you explicitly setup the object you expose for import.

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