diff --git a/Lib/textwrap.py b/Lib/textwrap.py
index 841de9baec..7ca393d1c3 100644
--- a/Lib/textwrap.py
+++ b/Lib/textwrap.py
@@ -63,10 +63,7 @@ class TextWrapper:
Append to the last line of truncated text.
"""
- unicode_whitespace_trans = {}
- uspace = ord(' ')
- for x in _whitespace:
- unicode_whitespace_trans[ord(x)] = uspace
+ unicode_whitespace_trans = dict.fromkeys(map(ord, _whitespace), ord(' '))
# This funky little regex is just the trick for splitting
# text up into word-wrappable chunks. E.g.
@@ -479,13 +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__":
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