Based on Python-ideas thread [[https://groups.google.com/d/topic/python-ideas/QYlbtgnSfM4/discussion|My objections to implicit package directories]] by Nick Coghlan and [[https://groups.google.com/d/msg/python-ideas/QYlbtgnSfM4/jJCM6PirLYIJ|this message]] from Yuval Greenfield:
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I've always had trouble understanding and explaining the complexities and intricacies of python packaging.`

Is there a most basic but comprehensive list of use cases?
}}}

 standard library:: import from a list of paths to be searched.
 current project:: import from a relative path based on this file's current directory
 package bundled with project:: import from a relative path based on an anchor directory
 virtual-env:: import from an alternative lists of paths based on an anchor directory