No need to assign the results of expressions used only for side effects.
diff --git a/Lib/genericpath.py b/Lib/genericpath.py
index 73d7b26..a0bf601 100644
--- a/Lib/genericpath.py
+++ b/Lib/genericpath.py
@@ -15,7 +15,7 @@
 def exists(path):
     """Test whether a path exists.  Returns False for broken symbolic links"""
     try:
-        st = os.stat(path)
+        os.stat(path)
     except os.error:
         return False
     return True