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Add initial 'whatsnew' section for PEP 570 (GH-12942)

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Guido van Rossum 2019-04-29 05:49:30 -07:00 committed by Pablo Galindo
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commit 843bf42aa6
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Doc/whatsnew/3.8.rst
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@ -83,6 +83,31 @@ See :pep:`572` for a full description.
.. TODO: Emily will sprint on docs at PyCon US 2019.
Positional-only parameters
--------------------------
There is new syntax (``/``) to indicate that some function parameters
must be specified positionally (i.e., cannot be used as keyword
arguments). This is the same notation as shown by ``help()`` for
functions implemented in C (produced by Larry Hastings' "Argument
Clinic" tool). Example::
def pow(x, y, z=None, /):
r = x**y
if z is not None:
r %= z
return r
Now ``pow(2, 10)`` and ``pow(2, 10, 17)`` are valid calls, but
``pow(x=2, y=10)`` and ``pow(2, 10, z=17)`` are invalid.
See :pep:`570` for a full description.
(Contributed by Pablo Galindo in :issue:`36540`.)
.. TODO: Pablo will sprint on docs at PyCon US 2019.
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