Nick Coghlan added the comment:

That part of the PEP was never implemented - relative imports have never been 
allowed to cross package boundaries in practice (which is also why "from . 
import sys" doesn't work as an equivalent to "import sys" at the interactive 
prompt or in a top level module).

Rather than amending the PEP, my inclination is to drop that cross-reference 
from the documentation, and instead add a new subsection to 
https://docs.python.org/3/reference/import.html covering "Package relative 
imports"

The key section that needs to be extracted is 
https://www.python.org/dev/peps/pep-0328/#guido-s-decision (minus the part 
about cross-package relative imports being permitted).

The following section about __name__ is also worth including but needs to be 
updated to account for __package__ (added by PEP 366), and __spec__ (added by 
PEP 451).

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<http://bugs.python.org/issue30840>
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