Bump black from 25.1.0 to 26.3.1 in /dev_tools/requirements/envs (#1218)

dependabot[bot] · web-flow · commit 63285282e394 · 2026-03-12T19:19:01.000Z
Bumps [black](https://github.com/psf/black) from 25.1.0 to 26.3.1. <details> <summary>Release notes</summary> <p><em>Sourced from <a href="https://github.com/psf/black/releases">black's releases</a>.</em></p> <blockquote> <h2>26.3.1</h2> <h3>Stable style</h3> <ul> <li>Prevent Jupyter notebook magic masking collisions from corrupting cells by using exact-length placeholders for short magics and aborting if a placeholder can no longer be unmasked safely (<a href="https://redirect.github.com/psf/black/issues/5038">#5038</a>)</li> </ul> <h3>Configuration</h3> <ul> <li>Always hash cache filename components derived from <code>--python-cell-magics</code> so custom magic names cannot affect cache paths (<a href="https://redirect.github.com/psf/black/issues/5038">#5038</a>)</li> </ul> <h3><em>Blackd</em></h3> <ul> <li>Disable browser-originated requests by default, add configurable origin allowlisting and request body limits, and bound executor submissions to improve backpressure (<a href="https://redirect.github.com/psf/black/issues/5039">#5039</a>)</li> </ul> <h2>26.3.0</h2> <h3>Stable style</h3> <ul> <li>Don't double-decode input, causing non-UTF-8 files to be corrupted (<a href="https://redirect.github.com/psf/black/issues/4964">#4964</a>)</li> <li>Fix crash on standalone comment in lambda default arguments (<a href="https://redirect.github.com/psf/black/issues/4993">#4993</a>)</li> <li>Preserve parentheses when <code># type: ignore</code> comments would be merged with other comments on the same line, preventing AST equivalence failures (<a href="https://redirect.github.com/psf/black/issues/4888">#4888</a>)</li> </ul> <h3>Preview style</h3> <ul> <li>Fix bug where <code>if</code> guards in <code>case</code> blocks were incorrectly split when the pattern had a trailing comma (<a href="https://redirect.github.com/psf/black/issues/4884">#4884</a>)</li> <li>Fix <code>string_processing</code> crashing on unassigned long string literals with trailing commas (one-item tuples) (<a href="https://redirect.github.com/psf/black/issues/4929">#4929</a>)</li> <li>Simplify implementation of the power operator &quot;hugging&quot; logic (<a href="https://redirect.github.com/psf/black/issues/4918">#4918</a>)</li> </ul> <h3>Packaging</h3> <ul> <li>Fix shutdown errors in PyInstaller builds on macOS by disabling multiprocessing in frozen environments (<a href="https://redirect.github.com/psf/black/issues/4930">#4930</a>)</li> </ul> <h3>Performance</h3> <ul> <li>Introduce winloop for windows as an alternative to uvloop (<a href="https://redirect.github.com/psf/black/issues/4996">#4996</a>)</li> <li>Remove deprecated function <code>uvloop.install()</code> in favor of <code>uvloop.new_event_loop()</code> (<a href="https://redirect.github.com/psf/black/issues/4996">#4996</a>)</li> <li>Rename <code>maybe_install_uvloop</code> function to <code>maybe_use_uvloop</code> to simplify loop installation and creation of either a uvloop/winloop evenloop or default eventloop (<a href="https://redirect.github.com/psf/black/issues/4996">#4996</a>)</li> </ul> <h3>Output</h3>  </blockquote> <p>... (truncated)</p> </details> <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/psf/black/blob/main/CHANGES.md">black's changelog</a>.</em></p> <blockquote> <h2>26.3.1</h2> <h3>Stable style</h3> <ul> <li>Prevent Jupyter notebook magic masking collisions from corrupting cells by using exact-length placeholders for short magics and aborting if a placeholder can no longer be unmasked safely (<a href="https://redirect.github.com/psf/black/issues/5038">#5038</a>)</li> </ul> <h3>Configuration</h3> <ul> <li>Always hash cache filename components derived from <code>--python-cell-magics</code> so custom magic names cannot affect cache paths (<a href="https://redirect.github.com/psf/black/issues/5038">#5038</a>)</li> </ul> <h3><em>Blackd</em></h3> <ul> <li>Disable browser-originated requests by default, add configurable origin allowlisting and request body limits, and bound executor submissions to improve backpressure (<a href="https://redirect.github.com/psf/black/issues/5039">#5039</a>)</li> </ul> <h2>26.3.0</h2> <h3>Stable style</h3> <ul> <li>Don't double-decode input, causing non-UTF-8 files to be corrupted (<a href="https://redirect.github.com/psf/black/issues/4964">#4964</a>)</li> <li>Fix crash on standalone comment in lambda default arguments (<a href="https://redirect.github.com/psf/black/issues/4993">#4993</a>)</li> <li>Preserve parentheses when <code># type: ignore</code> comments would be merged with other comments on the same line, preventing AST equivalence failures (<a href="https://redirect.github.com/psf/black/issues/4888">#4888</a>)</li> </ul> <h3>Preview style</h3> <ul> <li>Fix bug where <code>if</code> guards in <code>case</code> blocks were incorrectly split when the pattern had a trailing comma (<a href="https://redirect.github.com/psf/black/issues/4884">#4884</a>)</li> <li>Fix <code>string_processing</code> crashing on unassigned long string literals with trailing commas (one-item tuples) (<a href="https://redirect.github.com/psf/black/issues/4929">#4929</a>)</li> <li>Simplify implementation of the power operator &quot;hugging&quot; logic (<a href="https://redirect.github.com/psf/black/issues/4918">#4918</a>)</li> </ul> <h3>Packaging</h3> <ul> <li>Fix shutdown errors in PyInstaller builds on macOS by disabling multiprocessing in frozen environments (<a href="https://redirect.github.com/psf/black/issues/4930">#4930</a>)</li> </ul> <h3>Performance</h3> <ul> <li>Introduce winloop for windows as an alternative to uvloop (<a href="https://redirect.github.com/psf/black/issues/4996">#4996</a>)</li> <li>Remove deprecated function <code>uvloop.install()</code> in favor of <code>uvloop.new_event_loop()</code> (<a href="https://redirect.github.com/psf/black/issues/4996">#4996</a>)</li> <li>Rename <code>maybe_install_uvloop</code> function to <code>maybe_use_uvloop</code> to simplify loop installation and creation of either a uvloop/winloop evenloop or default eventloop (<a href="https://redirect.github.com/psf/black/issues/4996">#4996</a>)</li> </ul>  </blockquote> <p>... (truncated)</p> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/psf/black/commit/c6755bb741b6481d6b3d3bb563c83fa060db96c9"><code>c6755bb</code></a> Prepare release 26.3.1 (<a href="https://redirect.github.com/psf/black/issues/5046">#5046</a>)</li> <li><a href="https://github.com/psf/black/commit/69973fd6950985fbeb1090d96da717dc4d8380b0"><code>69973fd</code></a> Harden blackd browser-facing request handling (<a href="https://redirect.github.com/psf/black/issues/5039">#5039</a>)</li> <li><a href="https://github.com/psf/black/commit/4937fe6cf241139ddbfc16b0bdbb5b422798909d"><code>4937fe6</code></a> Fix some shenanigans with the cache file and IPython (<a href="https://redirect.github.com/psf/black/issues/5038">#5038</a>)</li> <li><a href="https://github.com/psf/black/commit/2e641d174469c505d5ae905e75d4c769597e681f"><code>2e641d1</code></a> docs: remove outdated Black Playground references (<a href="https://redirect.github.com/psf/black/issues/5044">#5044</a>)</li> <li><a href="https://github.com/psf/black/commit/c014b22a2d5e0632587b47b81151658bddfa0b88"><code>c014b22</code></a> Remove unused internal code (<a href="https://redirect.github.com/psf/black/issues/5041">#5041</a>)</li> <li><a href="https://github.com/psf/black/commit/0dae20b2d009f2f03de8696d06b0c947d3abafc9"><code>0dae20b</code></a> Add new changelog (<a href="https://redirect.github.com/psf/black/issues/5036">#5036</a>)</li> <li><a href="https://github.com/psf/black/commit/c5c1cbddd92cecb554ac2a77a24139dd76831030"><code>c5c1cbd</code></a> Minor release patches (<a href="https://redirect.github.com/psf/black/issues/5035">#5035</a>)</li> <li><a href="https://github.com/psf/black/commit/7e5a828c37d71b6a6666e28eed444816def6a8f4"><code>7e5a828</code></a> docs: clarify relationship between Black style and PEP 8 (<a href="https://redirect.github.com/psf/black/issues/5025">#5025</a>)</li> <li><a href="https://github.com/psf/black/commit/69705deb8776e7c5e585668da106d1abe2cb8d77"><code>69705de</code></a> docs: add clearer pyproject configuration guidance (<a href="https://redirect.github.com/psf/black/issues/5026">#5026</a>)</li> <li><a href="https://github.com/psf/black/commit/35ea67920b7f6ac8e09be1c47278752b1e827f76"><code>35ea679</code></a> Prepare release 26.3.0 (<a href="https://redirect.github.com/psf/black/issues/5032">#5032</a>)</li> <li>Additional commits viewable in <a href="https://github.com/psf/black/compare/25.1.0...26.3.1">compare view</a></li> </ul> </details> <br /> [![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=black&package-manager=pip&previous-version=25.1.0&new-version=26.3.1)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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diff --git a/dev_tools/requirements/envs/dev.env.txt b/dev_tools/requirements/envs/dev.env.txt
@@ -13,7 +13,7 @@ attrs==25.3.0
     #   cirq-core
     #   jsonschema
     #   referencing
-black==25.1.0
+black==26.3.1
     # via -r deps/format.txt
 build==1.2.2.post1
     # via pip-tools
diff --git a/dev_tools/requirements/envs/format.env.txt b/dev_tools/requirements/envs/format.env.txt
@@ -8,7 +8,7 @@ attrs==25.3.0
     # via
     #   -c envs/dev.env.txt
     #   cirq-core
-black==25.1.0
+black==26.3.1
     # via
     #   -c envs/dev.env.txt
     #   -r deps/format.txt
