Whitespace normalization.
diff --git a/Lib/popen2.py b/Lib/popen2.py
index 954eb29..8b1af76 100644
--- a/Lib/popen2.py
+++ b/Lib/popen2.py
@@ -158,7 +158,7 @@
         return inst.fromchild, inst.tochild
 
     __all__.extend(["Popen3", "Popen4"])
-    
+
 def _test():
     cmd  = "cat"
     teststr = "ab cd\n"