diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index ddbaec20a05..3493df1e467 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -708,7 +708,7 @@ def close(self) -> None:
         more information.
         """
         if getattr(self, "map", None):
-            if sys.platform == "win32" and hasattr(sys, "pypy_version_info"):
+            if sys.platform == "win32" and sys.implementation.name == "pypy":
                 self.map.close()
             self.map: mmap.mmap | None = None
 
diff --git a/src/PIL/ImageColor.py b/src/PIL/ImageColor.py
index ef1548c7e23..c2a84100f54 100644
--- a/src/PIL/ImageColor.py
+++ b/src/PIL/ImageColor.py
@@ -62,15 +62,12 @@ def getrgb(color: str) -> tuple[int, int, int] | tuple[int, int, int, int]:
         )
 
     if re.match("#[a-f0-9]{6}$", color):
-        return int(color[1:3], 16), int(color[3:5], 16), int(color[5:7], 16)
+        r, g, b = bytes.fromhex(color[1:])
+        return r, g, b
 
     if re.match("#[a-f0-9]{8}$", color):
-        return (
-            int(color[1:3], 16),
-            int(color[3:5], 16),
-            int(color[5:7], 16),
-            int(color[7:9], 16),
-        )
+        r, g, b, a = bytes.fromhex(color[1:])
+        return r, g, b, a
 
     m = re.match(r"rgb\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$", color)
     if m:
diff --git a/src/PIL/ImageFilter.py b/src/PIL/ImageFilter.py
index 428ceb1aaa9..ffdb7ffca10 100644
--- a/src/PIL/ImageFilter.py
+++ b/src/PIL/ImageFilter.py
@@ -17,7 +17,6 @@
 from __future__ import annotations
 
 import abc
-import functools
 from collections.abc import Sequence
 from typing import cast
 
@@ -79,7 +78,7 @@ def __init__(
     ) -> None:
         if scale is None:
             # default scale is sum of kernel
-            scale = functools.reduce(lambda a, b: a + b, kernel)
+            scale = sum(kernel)
         if size[0] * size[1] != len(kernel):
             msg = "not enough coefficients in kernel"
             raise ValueError(msg)
diff --git a/src/PIL/ImageOps.py b/src/PIL/ImageOps.py
index cdec4d5dc7d..fea9d1258bf 100644
--- a/src/PIL/ImageOps.py
+++ b/src/PIL/ImageOps.py
@@ -18,8 +18,6 @@
 #
 from __future__ import annotations
 
-import functools
-import operator
 import re
 from collections.abc import Sequence
 from typing import Literal, Protocol, cast, overload
@@ -120,9 +118,7 @@ def autocontrast(
             if not isinstance(cutoff, tuple):
                 cutoff = (cutoff, cutoff)
             # get number of pixels
-            n = 0
-            for ix in range(256):
-                n = n + h[ix]
+            n = sum(h)
             # remove cutoff% pixels from the low end
             cut = int(n * cutoff[0] // 100)
             for lo in range(256):
@@ -494,7 +490,7 @@ def equalize(image: Image.Image, mask: Image.Image | None = None) -> Image.Image
         if len(histo) <= 1:
             lut.extend(list(range(256)))
         else:
-            step = (functools.reduce(operator.add, histo) - histo[-1]) // 255
+            step = (sum(histo) - histo[-1]) // 255
             if not step:
                 lut.extend(list(range(256)))
             else:
diff --git a/src/PIL/PdfParser.py b/src/PIL/PdfParser.py
index 5ba70ba209d..132b6ac8b78 100644
--- a/src/PIL/PdfParser.py
+++ b/src/PIL/PdfParser.py
@@ -177,7 +177,7 @@ def keys(self) -> set[int]:
 
     def write(self, f: IO[bytes]) -> int:
         keys = sorted(set(self.new_entries.keys()) | set(self.deleted_entries.keys()))
-        deleted_keys = sorted(set(self.deleted_entries.keys()))
+        deleted_keys = sorted(self.deleted_entries)
         startxref = f.tell()
         f.write(b"xref\n")
         while keys: