Use more Pythonic style in gunicorn/.

gunicorn/glogging.py

@@ -314,7 +314,7 @@ class Logger(object):
 
     def _get_gunicorn_handler(self, log):
         for h in log.handlers:
-            if getattr(h, "_gunicorn", False) == True:
+            if getattr(h, "_gunicorn", False):
                 return h
 
     def _set_handler(self, log, output, fmt):

gunicorn/util.py

@@ -406,7 +406,7 @@ def daemonize(enable_stdio_inheritance=False):
     Standard daemonization of a process.
     http://www.svbug.com/documentation/comp.unix.programmer-FAQ/faq_2.html#SEC16
     """
-    if not 'GUNICORN_FD' in os.environ:
+    if 'GUNICORN_FD' not in os.environ:
         if os.fork():
             os._exit(0)
         os.setsid()

gunicorn/workers/gaiohttp.py

@@ -7,7 +7,7 @@ import sys
 
 if sys.version_info >= (3, 3):
     try:
-        import aiohttp
+        import aiohttp  # NOQA
     except ImportError:
         raise RuntimeError("You need aiohttp installed to use this worker.")
     else:

gunicorn/workers/gthread.py

@@ -15,7 +15,6 @@ from datetime import datetime
 import errno
 from functools import partial
 import os
-import operator
 import socket
 import ssl
 import sys