Remove redundant import.
diff --git a/Lib/cmd.py b/Lib/cmd.py
index 8976988..c791d6b 100644
--- a/Lib/cmd.py
+++ b/Lib/cmd.py
@@ -84,7 +84,6 @@
         sys.stdin and sys.stdout are used.
 
         """
-        import sys
         if stdin is not None:
             self.stdin = stdin
         else: