commit fcc2a21fae20b312e913a26121a12752ba768ad1
author Victor Stinner <victor.stinner@haypocalc.com> Wed Jun 29 20:01:29 2011 +0200
committer Victor Stinner <victor.stinner@haypocalc.com> Wed Jun 29 20:01:29 2011 +0200
tree ae0117cbd7684216c6c23f8bacf5feb974913863
parent 592f679dce01dce70f1f917270e84e09c92ff337

Issue #12400: regrtest.runtest() uses stream.seek(0) before .truncate()

.truncate(0) doesn't rewind.

Lib/test/regrtest.py

diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index f1ef715..14fa005 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -791,9 +791,12 @@
             # tests keep a reference to sys.stdout or sys.stderr
             # (eg. test_argparse).
             if runtest.stringio is None:
-                runtest.stringio = io.StringIO()
-            stream = runtest.stringio
-            stream.truncate(0)
+                stream = io.StringIO()
+                runtest.stringio = stream
+            else:
+                stream = runtest.stringio
+                stream.seek(0)
+                stream.truncate()
 
             orig_stdout = sys.stdout
             orig_stderr = sys.stderr