diff --git a/gunicorn/arbiter.py b/gunicorn/arbiter.py
index e1c9551e..fdd4ee2f 100644
--- a/gunicorn/arbiter.py
+++ b/gunicorn/arbiter.py
@@ -478,7 +478,7 @@ class Arbiter(object):
         util._setproctitle("master [%s]" % self.proc_name)
 
         # spawn new workers
-        for i in range(self.cfg.workers):
+        for _ in range(self.cfg.workers):
             self.spawn_worker()
 
         # manage workers
@@ -609,7 +609,7 @@ class Arbiter(object):
         of the master process.
         """
 
-        for i in range(self.num_workers - len(self.WORKERS.keys())):
+        for _ in range(self.num_workers - len(self.WORKERS.keys())):
             self.spawn_worker()
             time.sleep(0.1 * random.random())
 
diff --git a/gunicorn/sock.py b/gunicorn/sock.py
index 41e872c8..cc6c589a 100644
--- a/gunicorn/sock.py
+++ b/gunicorn/sock.py
@@ -94,7 +94,7 @@ class TCP6Socket(TCPSocket):
     FAMILY = socket.AF_INET6
 
     def __str__(self):
-        (host, port, fl, sc) = self.sock.getsockname()
+        (host, port, _, _) = self.sock.getsockname()
         return "http://[%s]:%d" % (host, port)
 
 
diff --git a/gunicorn/util.py b/gunicorn/util.py
index a3d6f64e..456267a1 100644
--- a/gunicorn/util.py
+++ b/gunicorn/util.py
@@ -61,7 +61,7 @@ except ImportError:
         if not hasattr(package, 'rindex'):
             raise ValueError("'package' not set to a string")
         dot = len(package)
-        for x in range(level, 1, -1):
+        for _ in range(level, 1, -1):
             try:
                 dot = package.rindex('.', 0, dot)
             except ValueError:
diff --git a/gunicorn/workers/base.py b/gunicorn/workers/base.py
index 6e2ad45c..f16c0e95 100644
--- a/gunicorn/workers/base.py
+++ b/gunicorn/workers/base.py
@@ -146,7 +146,7 @@ class Worker(object):
             # per https://docs.python.org/2/library/sys.html#sys.exc_info warning,
             # delete the traceback after use.
             try:
-                exc_type, exc_val, exc_tb = sys.exc_info()
+                _, exc_val, exc_tb = sys.exc_info()
                 self.reloader.add_extra_file(exc_val.filename)
 
                 tb_string = six.StringIO()
diff --git a/gunicorn/workers/gthread.py b/gunicorn/workers/gthread.py
index f9281588..5f918e2e 100644
--- a/gunicorn/workers/gthread.py
+++ b/gunicorn/workers/gthread.py
@@ -211,7 +211,7 @@ class ThreadWorker(base.Worker):
             if self.nr_conns < self.worker_connections:
                 # wait for an event
                 events = self.poller.select(1.0)
-                for key, mask in events:
+                for key, _ in events:
                     callback = key.data
                     callback(key.fileobj)