From 3439066c1943794beacb05011fd661fa35833bed Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?B=C3=A9n=C3=A9dikt=20Tran?=
 <10796600+picnixz@users.noreply.github.com>
Date: Sat, 29 Jul 2023 16:09:52 +0200
Subject: [PATCH] optimize textwrap.indent() (#107424)

---
 Lib/textwrap.py | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/Lib/textwrap.py b/Lib/textwrap.py
index 7ca393d1c371aa..6c1a2112931659 100644
--- a/Lib/textwrap.py
+++ b/Lib/textwrap.py
@@ -475,18 +475,22 @@ def indent(text, prefix, predicate=None):
     it will default to adding 'prefix' to all non-empty lines that do not
     consist solely of whitespace characters.
     """
+    prefixed_lines = []
+
     if predicate is None:
         # str.splitlines(True) doesn't produce empty string.
         #  ''.splitlines(True) => []
         #  'foo\n'.splitlines(True) => ['foo\n']
-        # So we can use just `not s.isspace()` here.
-        predicate = lambda s: not s.isspace()
-
-    prefixed_lines = []
-    for line in text.splitlines(True):
-        if predicate(line):
-            prefixed_lines.append(prefix)
-        prefixed_lines.append(line)
+        # So we can use just `not line.isspace()` here.
+        for line in text.splitlines(True):
+            if not line.isspace():
+                prefixed_lines.append(prefix)
+            prefixed_lines.append(line)
+    else:
+        for line in text.splitlines(True):
+            if predicate(line):
+                prefixed_lines.append(prefix)
+            prefixed_lines.append(line)
 
     return ''.join(prefixed_lines)