diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -688,6 +688,11 @@
 test_count = '/{}'.format(len(selected))
 test_count_width = len(test_count) - 1
 
+ if hasattr(sys.stdout, 'isatty') and sys.stdout.isatty():
+ end, just = '\r', 45
+ else:
+ end, just = '\n', 0
+
 if use_mp:
 try:
 from threading import Thread
@@ -760,7 +765,7 @@
 fmt = "[{1:{0}}{2}/{3}] {4}" if bad else "[{1:{0}}{2}] {4}"
 print(fmt.format(
 test_count_width, test_index, test_count,
- len(bad), test))
+ len(bad), test).ljust(just), end=end)
 if stdout:
 print(stdout)
 if stderr:
@@ -782,7 +787,8 @@
 if not quiet:
 fmt = "[{1:{0}}{2}/{3}] {4}" if bad else "[{1:{0}}{2}] {4}"
 print(fmt.format(
- test_count_width, test_index, test_count, len(bad), test))
+ test_count_width, test_index, test_count,
+ len(bad), test).ljust(just), end=end)
 sys.stdout.flush()
 if trace:
 # If we're tracing code coverage, then we don't exit with status
</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://bugs.python.org/file29585/regr.diff">(-&gt;オリジナル)</a>
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</p>
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