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Document PEP 585, 563, 604 and more. #9763

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Jan 6, 2021
Merged

Document PEP 585, 563, 604 and more. #9763

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8142da0
Document PEP 585, 563, 604 and more.
Nov 27, 2020
5bc7167
more edits
Nov 28, 2020
8e66ca3
more edits
Nov 28, 2020
218a46e
make string literal types use with future annotations more explicit
Dec 11, 2020
39e5ff9
cross reference generic classes
Dec 11, 2020
c0c14b4
fix nits
Dec 11, 2020
fb16a12
reference previous discussion in forward references
Dec 11, 2020
e5d098d
mention py39 in runtime generics section
Dec 11, 2020
b3d6644
Mention conditional import of typing_extensions
Dec 29, 2020
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hauntsaninja committed Dec 11, 2020
commit c0c14b45e105a5169896c4b32cbafeaea074b500
6 changes: 3 additions & 3 deletions docs/source/runtime_troubles.rst
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Expand Up @@ -189,7 +189,7 @@ Using classes that are generic in stubs but not at runtime
Some classes are declared as :ref:`generic<generic-classes>` in stubs, but not
at runtime.

In Python 3.8 and lower, there are several examples within the standard library,
In Python 3.8 and earlier, there are several examples within the standard library,
for instance, :py:class:`os.PathLike` and :py:class:`queue.Queue`. Subscripting
such a class will result in a runtime error:

Expand Down Expand Up @@ -268,7 +268,7 @@ Using generic builtins
Starting with Python 3.9 (:pep:`585`), the type objects of many collections in
the standard library support subscription at runtime. This means that you no
longer have to import the equivalents from :py:mod:`typing`; you can simply use
the built-in collections or those from :py:mod:`collections.abc`
the built-in collections or those from :py:mod:`collections.abc`:

.. code-block:: python

Expand Down Expand Up @@ -305,7 +305,7 @@ module in earlier versions of Python than the addition, for example, using any
of ``Literal``, ``Protocol``, ``TypedDict`` with Python 3.6.

The easiest way to do this is to install and use the ``typing_extensions``
package for the relevant imports, for example:
package from PyPI for the relevant imports, for example:

.. code-block:: python

Expand Down