[Python-checkins] cpython (3.5): Issue #28073: Improve wording around None. Michael Lee.

[guido.van.rossum]

https://hg.python.org/cpython/rev/75514816741a
changeset:   103601:75514816741a
branch:      3.5
parent:      103592:842e75f0e592
user:        Guido van Rossum <guido at python.org>
date:        Sat Sep 10 18:49:14 2016 -0700
summary:
  Issue #28073: Improve wording around None. Michael Lee.

files:
  Doc/library/typing.rst |  6 ++++--
  1 files changed, 4 insertions(+), 2 deletions(-)


diff --git a/Doc/library/typing.rst b/Doc/library/typing.rst
--- a/Doc/library/typing.rst
+++ b/Doc/library/typing.rst
@@ -59,6 +59,9 @@
            servers: List[Tuple[Tuple[str, int], Dict[str, str]]]) -> None:
        ...
 
+Note that ``None`` as a type hint is a special case and is replaced by
+``type(None)``.
+
 NewType
 -------
 
@@ -148,7 +151,6 @@
 It is possible to declare the return type of a callable without specifying
 the call signature by substituting a literal ellipsis
 for the list of arguments in the type hint: ``Callable[..., ReturnType]``.
-``None`` as a type hint is a special case and is replaced by ``type(None)``.
 
 Generics
 --------
@@ -443,7 +445,7 @@
 
    Optional type.
 
-   ``Optional[X]`` is equivalent to ``Union[X, type(None)]``.
+   ``Optional[X]`` is equivalent to ``Union[X, None]``.
 
    Note that this is not the same concept as an optional argument,
    which is one that has a default.  An optional argument with a

-- 
Repository URL: https://hg.python.org/cpython