remove a number of unused imports

eventlet/db_pool.py

@@ -92,7 +92,6 @@ NOTE: The DatabaseConnector is a bit unfinished, it only suits a subset of use c
 """
 
 from collections import deque
-import os
 import sys
 import time
 

eventlet/pools.py

@@ -23,7 +23,6 @@ THE SOFTWARE.
 """
 
 import collections
-import traceback
 
 from eventlet import api
 from eventlet import channel

eventlet/processes.py

@@ -25,12 +25,10 @@ import errno
 import os
 import popen2
 import signal
-import sys
 
 from eventlet import coros
 from eventlet import pools
 from eventlet import greenio
-from eventlet import util
 
 
 class DeadProcess(RuntimeError):

eventlet/tpool.py

@@ -75,7 +75,7 @@ def tworker():
         except SYS_EXCS:
             raise
         except Exception,exn:
-            import sys, traceback
+            import sys
             (a,b,tb) = sys.exc_info()
             rv = (exn,a,b,tb)
         _rspq.put((e,rv))
@@ -86,7 +86,7 @@ def tworker():
 def erecv(e):
     rv = e.wait()
     if isinstance(rv,tuple) and len(rv) == 4 and isinstance(rv[0],Exception):
-        import sys, traceback
+        import traceback
         (e,a,b,tb) = rv
         if not QUIET:
             traceback.print_exception(Exception,e,tb)

eventlet/util.py

@@ -26,7 +26,6 @@ THE SOFTWARE.
 import os
 import select
 import socket
-import sys
 import errno
 
 try:
@@ -81,7 +80,7 @@ except AttributeError:
 
 def wrap_ssl(sock, certificate=None, private_key=None):
     from OpenSSL import SSL
-    from eventlet import greenio, util
+    from eventlet import greenio
     context = SSL.Context(SSL.SSLv23_METHOD)
     if certificate is not None:
         context.use_certificate_file(certificate)