From 0953bc50226ef8b1885a1c75db802d0cecfccb84 Mon Sep 17 00:00:00 2001
From: BobTheBuidler <70677534+BobTheBuidler@users.noreply.github.com>
Date: Sat, 17 May 2025 15:51:29 -0400
Subject: [PATCH 1/6] feat: optimize apply_formatter_at_index

---
 eth_utils/applicators.py | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/eth_utils/applicators.py b/eth_utils/applicators.py
index 9bfd5939..4bc8dd20 100644
--- a/eth_utils/applicators.py
+++ b/eth_utils/applicators.py
@@ -30,16 +30,18 @@
 def apply_formatter_at_index(
     formatter: Callable[..., Any], at_index: int, value: List[Any]
 ) -> Generator[List[Any], None, None]:
-    if at_index + 1 > len(value):
+    try:
+        item = value[at_index]
+    except IndexError:
         raise IndexError(
             f"Not enough values in iterable to apply formatter. Got: {len(value)}. "
             f"Need: {at_index + 1}"
         )
-    for index, item in enumerate(value):
-        if index == at_index:
-            yield formatter(item)
-        else:
-            yield item
+
+    yield from value[:at_index]
+    yield formatter(item)
+    if remaining := value[at_index+1:]:
+        yield from remaining
 
 
 def combine_argument_formatters(*formatters: List[Callable[..., Any]]) -> Formatters:

From bf0fb110d5df33d67edc6321e0a387ad3ba24461 Mon Sep 17 00:00:00 2001
From: BobTheBuidler <70677534+BobTheBuidler@users.noreply.github.com>
Date: Sat, 17 May 2025 17:06:52 -0400
Subject: [PATCH 2/6] chore: lint

---
 eth_utils/applicators.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/eth_utils/applicators.py b/eth_utils/applicators.py
index 4bc8dd20..a58941eb 100644
--- a/eth_utils/applicators.py
+++ b/eth_utils/applicators.py
@@ -40,7 +40,7 @@ def apply_formatter_at_index(
 
     yield from value[:at_index]
     yield formatter(item)
-    if remaining := value[at_index+1:]:
+    if remaining := value[at_index + 1 :]:
         yield from remaining
 
 

From 56b859ac10abc84457a632b3f463a064b5844fe1 Mon Sep 17 00:00:00 2001
From: BobTheBuidler <70677534+BobTheBuidler@users.noreply.github.com>
Date: Sat, 17 May 2025 17:08:04 -0400
Subject: [PATCH 3/6] Update applicators.py

---
 eth_utils/applicators.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/eth_utils/applicators.py b/eth_utils/applicators.py
index a58941eb..a250dc06 100644
--- a/eth_utils/applicators.py
+++ b/eth_utils/applicators.py
@@ -36,7 +36,7 @@ def apply_formatter_at_index(
         raise IndexError(
             f"Not enough values in iterable to apply formatter. Got: {len(value)}. "
             f"Need: {at_index + 1}"
-        )
+        ) from None
 
     yield from value[:at_index]
     yield formatter(item)

From c90ac8f825568a82f67983ba6e2b30bfaed30a9e Mon Sep 17 00:00:00 2001
From: BobTheBuidler <70677534+BobTheBuidler@users.noreply.github.com>
Date: Mon, 19 May 2025 14:08:15 -0400
Subject: [PATCH 4/6] Create 306.performance.rst

---
 newsfragments/306.performance.rst | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 newsfragments/306.performance.rst

diff --git a/newsfragments/306.performance.rst b/newsfragments/306.performance.rst
new file mode 100644
index 00000000..1b08a297
--- /dev/null
+++ b/newsfragments/306.performance.rst
@@ -0,0 +1 @@
+optimize apply_formatter_at_index

From dcd8037ee0964e495cb88a899b2011e6763b2e1e Mon Sep 17 00:00:00 2001
From: BobTheBuidler <70677534+BobTheBuidler@users.noreply.github.com>
Date: Mon, 19 May 2025 14:29:28 -0400
Subject: [PATCH 5/6] Update applicators.py

---
 eth_utils/applicators.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/eth_utils/applicators.py b/eth_utils/applicators.py
index a250dc06..86ef5f2a 100644
--- a/eth_utils/applicators.py
+++ b/eth_utils/applicators.py
@@ -40,8 +40,7 @@ def apply_formatter_at_index(
 
     yield from value[:at_index]
     yield formatter(item)
-    if remaining := value[at_index + 1 :]:
-        yield from remaining
+    yield from value[at_index + 1 :]
 
 
 def combine_argument_formatters(*formatters: List[Callable[..., Any]]) -> Formatters:

From 67bfe3980da6034e7711530ec99c75e359c728ac Mon Sep 17 00:00:00 2001
From: BobTheBuidler <70677534+BobTheBuidler@users.noreply.github.com>
Date: Sun, 5 Oct 2025 03:05:16 -0400
Subject: [PATCH 6/6] Update applicators.py

---
 eth_utils/applicators.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/eth_utils/applicators.py b/eth_utils/applicators.py
index 86ef5f2a..5cb3e91f 100644
--- a/eth_utils/applicators.py
+++ b/eth_utils/applicators.py
@@ -28,8 +28,8 @@
 
 @return_arg_type(2)
 def apply_formatter_at_index(
-    formatter: Callable[..., Any], at_index: int, value: List[Any]
-) -> Generator[List[Any], None, None]:
+    formatter: Callable[..., Any], at_index: int, value: Sequence[Any]
+) -> Generator[Any, None, None]:
     try:
         item = value[at_index]
     except IndexError: