From 3cb9731b7e59b0df9a7a9ab6b7746a669958b693 Mon Sep 17 00:00:00 2001
From: Jacob Hayes <jacob.r.hayes@gmail.com>
Date: Wed, 8 Dec 2021 13:52:57 -0500
Subject: [PATCH] bpo-45359: Support TopologicalSorter type subscript
 (GH-28714)
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* Support TopologicalSorter type subscript

* 📜🤖 Added by blurb_it.

* Add TopologicalSorter to GenericAlias tests

* Update Misc/NEWS.d/next/Library/2021-10-03-22-27-35.bpo-45359.LX_uxe.rst

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Batuhan Taskaya <isidentical@gmail.com>
---
 Lib/graphlib.py                                               | 4 ++++
 Lib/test/test_genericalias.py                                 | 2 ++
 .../next/Library/2021-10-03-22-27-35.bpo-45359.LX_uxe.rst     | 1 +
 3 files changed, 7 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2021-10-03-22-27-35.bpo-45359.LX_uxe.rst

diff --git a/Lib/graphlib.py b/Lib/graphlib.py
index 1c5d9a413c9..636545648e1 100644
--- a/Lib/graphlib.py
+++ b/Lib/graphlib.py
@@ -1,3 +1,5 @@
+from types import GenericAlias
+
 __all__ = ["TopologicalSorter", "CycleError"]
 
 _NODE_OUT = -1
@@ -244,3 +246,5 @@ def static_order(self):
             node_group = self.get_ready()
             yield from node_group
             self.done(*node_group)
+
+    __class_getitem__ = classmethod(GenericAlias)
diff --git a/Lib/test/test_genericalias.py b/Lib/test/test_genericalias.py
index 0daaff099a8..706cc5ea1af 100644
--- a/Lib/test/test_genericalias.py
+++ b/Lib/test/test_genericalias.py
@@ -13,6 +13,7 @@
 from contextvars import ContextVar, Token
 from dataclasses import Field
 from functools import partial, partialmethod, cached_property
+from graphlib import TopologicalSorter
 from mailbox import Mailbox, _PartialFile
 try:
     import ctypes
@@ -56,6 +57,7 @@ class BaseTest(unittest.TestCase):
                      OrderedDict, Counter, UserDict, UserList,
                      Pattern, Match,
                      partial, partialmethod, cached_property,
+                     TopologicalSorter,
                      AbstractContextManager, AbstractAsyncContextManager,
                      Awaitable, Coroutine,
                      AsyncIterable, AsyncIterator,
diff --git a/Misc/NEWS.d/next/Library/2021-10-03-22-27-35.bpo-45359.LX_uxe.rst b/Misc/NEWS.d/next/Library/2021-10-03-22-27-35.bpo-45359.LX_uxe.rst
new file mode 100644
index 00000000000..6f5c97fde82
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2021-10-03-22-27-35.bpo-45359.LX_uxe.rst
@@ -0,0 +1 @@
+Implement :pep:`585` for :class:`graphlib.TopologicalSorter`.
\ No newline at end of file