https://github.com/python/cpython/commit/4e57e213d6bb32c8d6b1cf50d0231eafb6f1b73b
commit: 4e57e213d6bb32c8d6b1cf50d0231eafb6f1b73b
branch: 3.14
author: Miss Islington (bot) <31488909+miss-isling...@users.noreply.github.com>
committer: hugovk <1324225+hug...@users.noreply.github.com>
date: 2025-05-09T19:12:48+03:00
summary:
[3.14] gh-123299: Some copyedits to What's New in 3.14 (GH-133622) (#133771)
Co-authored-by: Éric <eara...@caravan.coop>
files:
M Doc/whatsnew/3.14.rst
diff --git a/Doc/whatsnew/3.14.rst b/Doc/whatsnew/3.14.rst
index 894f011ec86a30..9265024378cc6c 100644
--- a/Doc/whatsnew/3.14.rst
+++ b/Doc/whatsnew/3.14.rst
@@ -153,10 +153,10 @@ As another example, generating HTML attributes from data:
.. code-block:: python
attributes = {"src": "shrubbery.jpg", "alt": "looks nice"}
- template = t"<img {attributes} />"
- assert html(template) == '<img src="shrubbery.jpg" alt="looks nice"
class="looks-nice" />'
+ template = t"<img {attributes}>"
+ assert html(template) == '<img src="shrubbery.jpg" alt="looks nice"
class="looks-nice">'
-Unlike f-strings, the ``html`` function has access to template attributes
+Compared to using an f-string, the ``html`` function has access to template
attributes
containing the original information: static strings, interpolations, and values
from the original scope. Unlike existing templating approaches, t-strings build
from the well-known f-string syntax and rules. Template systems thus benefit
@@ -443,6 +443,9 @@ Python without deferred evaluation of annotations, reaches
its end of life in 20
In Python 3.14, the behavior of code using ``from __future__ import
annotations``
is unchanged.
+.. seealso::
+ :pep:`649`.
+
Improved error messages
-----------------------
@@ -584,8 +587,27 @@ Improved error messages
^^^^^^
SyntaxError: cannot use subscript as import target
-.. seealso::
- :pep:`649`.
+* Improved error message when trying to add an instance of an unhashable type
to
+ a :class:`dict` or :class:`set`. (Contributed by CF Bolz-Tereick and Victor
Stinner
+ in :gh:`132828`.)
+
+ .. code-block:: pycon
+
+ >>> s = set()
+ >>> s.add({'pages': 12, 'grade': 'A'})
+ Traceback (most recent call last):
+ File "<python-input-1>", line 1, in <module>
+ s.add({'pages': 12, 'grade': 'A'})
+ ~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ TypeError: cannot use 'dict' as a set element (unhashable type: 'dict')
+ >>> d = {}
+ >>> l = [1, 2, 3]
+ >>> d[l] = 12
+ Traceback (most recent call last):
+ File "<python-input-4>", line 1, in <module>
+ d[l] = 12
+ ~^^^
+ TypeError: cannot use 'list' as a dict key (unhashable type: 'list')
.. _whatsnew314-pep741:
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