Jul 29, 2023 · Jul 28, 2023 · Jul 28, 2023 · Jul 28, 2023 · Jul 28, 2023 · Jul 29, 2023
diff --git a/Doc/whatsnew/3.13.rst b/Doc/whatsnew/3.13.rst
 Optimizations
 =============


 * :func:`textwrap.indent` is now ~30% faster than before for large input.
  (Contributed by Inada Naoki in :gh:`107369`.)


 Deprecated
diff --git a/Lib/textwrap.py b/Lib/textwrap.py
    consist solely of whitespace characters.
    """
    if predicate is None:
        def predicate(line):
            return line.strip()

    def prefixed_lines():
        for line in text.splitlines(True):
            yield (prefix + line if predicate(line) else line)
    return ''.join(prefixed_lines())
        # 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)

    return ''.join(prefixed_lines)


 if __name__ == "__main__":
diff --git a/Misc/NEWS.d/next/Library/2023-07-28-14-56-35.gh-issue-107369.bvTq8F.rst b/Misc/NEWS.d/next/Library/2023-07-28-14-56-35.gh-issue-107369.bvTq8F.rst
 Optimize :func:`textwrap.indent`. It is ~30% faster for large input. Patch
 by Inada Naoki.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -144,7 +144,8 @@ typing
		Optimizations
		=============


		* :func:`textwrap.indent` is now ~30% faster than before for large input.
		(Contributed by Inada Naoki in :gh:`107369`.)


		Deprecated
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -476,13 +476,19 @@ def indent(text, prefix, predicate=None):
		consist solely of whitespace characters.
		"""
		if predicate is None:
		def predicate(line):
		return line.strip()

		def prefixed_lines():
		for line in text.splitlines(True):
		yield (prefix + line if predicate(line) else line)
		return ''.join(prefixed_lines())
		# 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)

		return ''.join(prefixed_lines)


		if __name__ == "__main__":
Expand Down
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		Optimize :func:`textwrap.indent`. It is ~30% faster for large input. Patch
		by Inada Naoki.