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)
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