From 853f92263fb906841511d3971679c94ce23edb02 Mon Sep 17 00:00:00 2001
From: Frazer McLean <frazer@frazermclean.co.uk>
Date: Wed, 27 Jul 2022 20:43:46 +0100
Subject: [PATCH 1/2] Improve Signature.bind error message for missing
 keyword-only params

Fixes GH-83901
---
 Lib/inspect.py           | 8 ++++++--
 Lib/test/test_inspect.py | 3 ++-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/Lib/inspect.py b/Lib/inspect.py
index cbc0632484b832..a1cd53a594a661 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -3114,8 +3114,12 @@ def _bind(self, args, kwargs, *, partial=False):
                             parameters_ex = (param,)
                             break
                         else:
-                            msg = 'missing a required argument: {arg!r}'
-                            msg = msg.format(arg=param.name)
+                            if param.kind == _KEYWORD_ONLY:
+                                argtype = ' keyword-only'
+                            else:
+                                argtype = ''
+                            msg = 'missing a required{argtype} argument: {arg!r}'
+                            msg = msg.format(arg=param.name, argtype=argtype)
                             raise TypeError(msg) from None
             else:
                 # We have a positional argument to process
diff --git a/Lib/test/test_inspect.py b/Lib/test/test_inspect.py
index be9f29e04ae110..3df9f42eb43867 100644
--- a/Lib/test/test_inspect.py
+++ b/Lib/test/test_inspect.py
@@ -3891,7 +3891,8 @@ def test(foo, *, bar):
             self.call(test, 1, bar=2, spam='ham')
 
         with self.assertRaisesRegex(TypeError,
-                                     "missing a required argument: 'bar'"):
+                                     "missing a required keyword-only "
+                                     "argument: 'bar'"):
             self.call(test, 1)
 
         def test(foo, *, bar, **bin):

From 536734c675f1def479d303bf6dc3ba3f37bc5002 Mon Sep 17 00:00:00 2001
From: "blurb-it[bot]" <43283697+blurb-it[bot]@users.noreply.github.com>
Date: Wed, 27 Jul 2022 19:47:52 +0000
Subject: [PATCH 2/2] =?UTF-8?q?=F0=9F=93=9C=F0=9F=A4=96=20Added=20by=20blu?=
 =?UTF-8?q?rb=5Fit.?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../next/Library/2022-07-27-19-47-51.gh-issue-83901.OSw06c.rst   | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 Misc/NEWS.d/next/Library/2022-07-27-19-47-51.gh-issue-83901.OSw06c.rst

diff --git a/Misc/NEWS.d/next/Library/2022-07-27-19-47-51.gh-issue-83901.OSw06c.rst b/Misc/NEWS.d/next/Library/2022-07-27-19-47-51.gh-issue-83901.OSw06c.rst
new file mode 100644
index 00000000000000..da407905a886fd
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2022-07-27-19-47-51.gh-issue-83901.OSw06c.rst
@@ -0,0 +1 @@
+Improve :meth:`Signature.bind <inspect.Signature.bind>` error message for missing keyword-only arguments.