Implemented PEP 405 (Python virtual environments).
diff --git a/Lib/test/test_cmd.py b/Lib/test/test_cmd.py
index 3a46355..6618535 100644
--- a/Lib/test/test_cmd.py
+++ b/Lib/test/test_cmd.py
@@ -228,7 +228,7 @@
 
 def test_coverage(coverdir):
     trace = support.import_module('trace')
-    tracer=trace.Trace(ignoredirs=[sys.prefix, sys.exec_prefix,],
+    tracer=trace.Trace(ignoredirs=[sys.base_prefix, sys.base_exec_prefix,],
                         trace=0, count=1)
     tracer.run('reload(cmd);test_main()')
     r=tracer.results()