Removed an unused import

concurrent/futures/__init__.py

diff --git a/concurrent/futures/__init__.py b/concurrent/futures/__init__.py
index 9bbeb30..428b14b 100644
--- a/concurrent/futures/__init__.py
+++ b/concurrent/futures/__init__.py
@@ -15,7 +15,6 @@
                                       wait,
                                       as_completed)
 from concurrent.futures.thread import ThreadPoolExecutor
-import sys
 
 try:
     from concurrent.futures.process import ProcessPoolExecutor