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Wed Feb 10 12:52:23 EST 2016 · http://mail.python.org/pipermail/python-dev/2016-February/143250.html

On Wed, Feb 10, 2016 at 1:11 AM, Phil Thompson
<phil at riverbankcomputing.com> wrote:
> I understand now. The documentation, as it stands, is correct and consistent but (to me) the meaning of Optional is completely counter-intuitive. What you suggest with str = ... is exactly what I need. Adding a section to the docs describing that should clear up the confusion.

I tried to add some clarity to the docs with this paragraph:

   Note that this is not the same concept as an optional argument,
   which is one that has a default.  An optional argument with a
   default needn't use the ``Optional`` qualifier on its type
   annotation (although it is inferred if the default is ``None``).
   A mandatory argument may still have an ``Optional`` type if an
   explicit value of ``None`` is allowed.

Should be live on docs.python.org with the next push (I don't recall
the delay, at most a day IIRC).

-- 
--Guido van Rossum (python.org/~guido)

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[Python-Dev] Experiences with Creating PEP 484 Stub Files