From 609365496657faeaf0c2390feb660d0aa3d95368 Mon Sep 17 00:00:00 2001
From: Hao Wang <hwang628@berkeley.edu>
Date: Sun, 29 Dec 2024 01:31:07 +0800
Subject: [PATCH 1/3] use startwith tuple for speed

---
 src/blib2to3/pgen2/tokenize.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/blib2to3/pgen2/tokenize.py b/src/blib2to3/pgen2/tokenize.py
index 97dd92b06f0..407c184dd74 100644
--- a/src/blib2to3/pgen2/tokenize.py
+++ b/src/blib2to3/pgen2/tokenize.py
@@ -221,7 +221,7 @@ def _combinations(*l: str) -> set[str]:
     | {f"{prefix}'" for prefix in _strprefixes | _fstring_prefixes}
     | {f'{prefix}"' for prefix in _strprefixes | _fstring_prefixes}
 )
-fstring_prefix: Final = (
+fstring_prefix: Final = tuple(
     {f"{prefix}'" for prefix in _fstring_prefixes}
     | {f'{prefix}"' for prefix in _fstring_prefixes}
     | {f"{prefix}'''" for prefix in _fstring_prefixes}
@@ -459,7 +459,7 @@ def untokenize(iterable: Iterable[TokenInfo]) -> str:
 
 
 def is_fstring_start(token: str) -> bool:
-    return builtins.any(token.startswith(prefix) for prefix in fstring_prefix)
+    return token.startswith(fstring_prefix)
 
 
 def _split_fstring_start_and_middle(token: str) -> tuple[str, str]:

From bc7e300db72dfd276613c746d3b5b6f64443d82c Mon Sep 17 00:00:00 2001
From: Hao Wang <hwang628@berkeley.edu>
Date: Mon, 30 Dec 2024 00:51:18 +0800
Subject: [PATCH 2/3] update changelog

---
 CHANGES.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGES.md b/CHANGES.md
index d2955d2df0a..613d25d39a7 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -43,6 +43,7 @@
 ### Performance
 
 <!-- Changes that improve Black's performance. -->
+- Speed up the `is_fstring_start` function in `blib2to3` tokenization using generic python `startswith` function (#4541)
 
 ### Output
 

From 42fa1f33c1d356f95cc913ec882005642c778d37 Mon Sep 17 00:00:00 2001
From: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Date: Sun, 29 Dec 2024 17:08:41 -0800
Subject: [PATCH 3/3] Update CHANGES.md

---
 CHANGES.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CHANGES.md b/CHANGES.md
index 613d25d39a7..77fe17c03d3 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -43,7 +43,7 @@
 ### Performance
 
 <!-- Changes that improve Black's performance. -->
-- Speed up the `is_fstring_start` function in `blib2to3` tokenization using generic python `startswith` function (#4541)
+- Speed up the `is_fstring_start` function in Black's tokenizer (#4541)
 
 ### Output