Patch #2167 from calvin: Remove unused imports
diff --git a/Lib/test/test_doctest.py b/Lib/test/test_doctest.py
index 8c8786a..943fb82 100644
--- a/Lib/test/test_doctest.py
+++ b/Lib/test/test_doctest.py
@@ -2418,7 +2418,7 @@
     from test import test_doctest
     test_support.run_doctest(test_doctest, verbosity=True)
 
-import trace, sys, re, StringIO
+import trace, sys
 def test_coverage(coverdir):
     tracer = trace.Trace(ignoredirs=[sys.prefix, sys.exec_prefix,],
                          trace=0, count=1)