diff --git a/src/callbacks.py b/src/callbacks.py
index 6715410f5..60c3824b0 100644
--- a/src/callbacks.py
+++ b/src/callbacks.py
@@ -34,7 +34,6 @@ This module contains the basic callbacks for handling PRIVMSGs.
 """
 
 import re
-import sys
 import copy
 import time
 from . import shlex
@@ -46,7 +45,7 @@ from . import (conf, ircdb, irclib, ircmsgs, ircutils, log, registry,
         utils, world)
 from .utils import minisix
 from .utils.iter import any, all
-from .i18n import PluginInternationalization, internationalizeDocstring
+from .i18n import PluginInternationalization
 _ = PluginInternationalization()
 
 def _addressed(nick, msg, prefixChars=None, nicks=None,
@@ -318,7 +317,6 @@ class Tokenizer(object):
                 ret.append(self._insideBrackets(lexer))
             else:
                 ret.append(self._handleToken(token))
-            firstToken = False
         return ret
 
     def tokenize(self, s):
@@ -372,7 +370,6 @@ def tokenize(s, channel=None):
         if conf.get(nested.pipeSyntax, channel): # No nesting, no pipe.
             pipe = True
     quotes = conf.get(conf.supybot.commands.quotes, channel)
-    start = time.time()
     try:
         ret = Tokenizer(brackets=brackets,pipe=pipe,quotes=quotes).tokenize(s)
         return ret
diff --git a/src/commands.py b/src/commands.py
index b494349d4..dd023cd9b 100644
--- a/src/commands.py
+++ b/src/commands.py
@@ -266,7 +266,7 @@ def getInt(irc, msg, args, state, type=_('integer'), p=None):
 
 def getNonInt(irc, msg, args, state, type=_('non-integer value')):
     try:
-        i = _int(args[0])
+        _int(args[0])
         state.errorInvalid(type, args[0])
     except ValueError:
         state.args.append(args.pop(0))
@@ -303,7 +303,7 @@ def getId(irc, msg, args, state, kind=None):
     try:
         args[0] = args[0].lstrip('#')
         getInt(irc, msg, args, state, type=type)
-    except Exception as e:
+    except Exception:
         args[0] = original
         raise
 
@@ -398,9 +398,9 @@ def getHostmask(irc, msg, args, state):
 def getBanmask(irc, msg, args, state):
     getHostmask(irc, msg, args, state)
     getChannel(irc, msg, args, state)
-    channel = state.channel
     banmaskstyle = conf.supybot.protocols.irc.banmask
-    state.args[-1] = banmaskstyle.makeBanmask(state.args[-1])
+    state.args[-1] = banmaskstyle.makeBanmask(state.args[-1],
+            channel=state.channel)
 
 def getUser(irc, msg, args, state):
     try:
@@ -431,7 +431,7 @@ def _getRe(f):
         s = args.pop(0)
         def isRe(s):
             try:
-                foo = f(s)
+                f(s)
                 return True
             except ValueError:
                 return False
@@ -466,7 +466,7 @@ def getNick(irc, msg, args, state):
 
 def getSeenNick(irc, msg, args, state, errmsg=None):
     try:
-        foo = irc.state.nickToHostmask(args[0])
+        irc.state.nickToHostmask(args[0])
         state.args.append(args.pop(0))
     except KeyError:
         if errmsg is None:
@@ -850,7 +850,7 @@ class rest(context):
             args[:] = [' '.join(args)]
             try:
                 super(rest, self).__call__(irc, msg, args, state)
-            except Exception as e:
+            except Exception:
                 args[:] = original
         else:
             raise IndexError
@@ -954,7 +954,7 @@ class commalist(context):
                     if part: # trailing commas
                         super(commalist, self).__call__(irc, msg, [part], st)
             state.args.append(st.args)
-        except Exception as e:
+        except Exception:
             args[:] = original
             raise
 
diff --git a/src/conf.py b/src/conf.py
index 8712ab040..3b08435be 100644
--- a/src/conf.py
+++ b/src/conf.py
@@ -307,7 +307,7 @@ def registerNetwork(name, password='', ssl=False, sasl_username='',
         _("""Determines what password will be used on %s.  Yes, we know that
         technically passwords are server-specific and not network-specific,
         but this is the best we can do right now.""") % name, private=True))
-    registryServers = registerGlobalValue(network, 'servers', Servers([],
+    registerGlobalValue(network, 'servers', Servers([],
         _("""Space-separated list of servers the bot will connect to for %s.
         Each will be tried in order, wrapping back to the first when the cycle
         is completed.""") % name))
diff --git a/src/dbi.py b/src/dbi.py
index 89a1d8240..10aa3d651 100644
--- a/src/dbi.py
+++ b/src/dbi.py
@@ -142,7 +142,7 @@ class DirMapping(MappingInterface):
     def remove(self, id):
         try:
             os.remove(self._makeFilename(id))
-        except EnvironmentError as e:
+        except EnvironmentError:
             raise NoRecordError(id)
 
 class FlatfileMapping(MappingInterface):
diff --git a/src/drivers/Socket.py b/src/drivers/Socket.py
index 760e97b26..cd96b1682 100644
--- a/src/drivers/Socket.py
+++ b/src/drivers/Socket.py
@@ -35,15 +35,13 @@ Contains simple socket drivers.  Asyncore bugged (haha, pun!) me.
 from __future__ import division
 
 import os
-import sys
 import time
 import errno
 import select
 import socket
 
-from .. import (conf, drivers, log, schedule, utils, world)
+from .. import (conf, drivers, log, utils, world)
 from ..utils import minisix
-from ..utils.iter import imap
 from ..utils.str import decode_raw_line
 
 try:
@@ -241,7 +239,6 @@ class SocketDriver(drivers.IrcDriver, drivers.ServersMixin):
         server = self._getNextServer()
         socks_proxy = getattr(conf.supybot.networks, self.irc.network) \
                 .socksproxy()
-        resolver = None
         try:
             if socks_proxy:
                 import socks
diff --git a/src/drivers/Twisted.py b/src/drivers/Twisted.py
index fc3c6ed8c..dc65b90ae 100644
--- a/src/drivers/Twisted.py
+++ b/src/drivers/Twisted.py
@@ -28,7 +28,7 @@
 # POSSIBILITY OF SUCH DAMAGE.
 ###
 
-from .. import conf, drivers, ircmsgs, log
+from .. import conf, drivers
 
 from twisted.names import client
 from twisted.internet import reactor, error
diff --git a/src/drivers/__init__.py b/src/drivers/__init__.py
index c41913fa0..1818fdb08 100644
--- a/src/drivers/__init__.py
+++ b/src/drivers/__init__.py
@@ -32,8 +32,6 @@
 Contains various drivers (network, file, and otherwise) for using IRC objects.
 """
 
-import sys
-import time
 import socket
 
 from .. import conf, ircmsgs, log as supylog, utils
diff --git a/src/gpg.py b/src/gpg.py
index 44615d7bb..45e17e60c 100644
--- a/src/gpg.py
+++ b/src/gpg.py
@@ -28,11 +28,9 @@
 ###
 
 import os
-import traceback
 
 import supybot.log as log
 import supybot.conf as conf
-import supybot.world as world
 
 try:
     import gnupg
diff --git a/src/httpserver.py b/src/httpserver.py
index f3932d850..e08367748 100644
--- a/src/httpserver.py
+++ b/src/httpserver.py
@@ -32,7 +32,6 @@ An embedded and centralized HTTP server for Supybot's plugins.
 """
 
 import os
-import sys
 import cgi
 import socket
 from threading import Thread
@@ -389,7 +388,6 @@ class Favicon(SupyHTTPServerCallback):
     def doGet(self, handler, path):
         response = None
         file_path = conf.supybot.servers.http.favicon()
-        found = False
         if file_path:
             try:
                 icon = open(file_path, 'rb')
@@ -399,12 +397,12 @@ class Favicon(SupyHTTPServerCallback):
             finally:
                 icon.close()
         if response is not None:
-            filename = file_path.rsplit(os.sep, 1)[1]
-            if '.' in filename:
-                ext = filename.rsplit('.', 1)[1]
-            else:
-                ext = 'ico'
             # I have no idea why, but this headers are already sent.
+            # filename = file_path.rsplit(os.sep, 1)[1]
+            # if '.' in filename:
+            #     ext = filename.rsplit('.', 1)[1]
+            # else:
+            #     ext = 'ico'
             # self.send_header('Content-Length', len(response))
             # self.send_header('Content-type', 'image/' + ext)
             # self.end_headers()
@@ -461,7 +459,7 @@ def unhook(subdir):
     global http_servers
     assert isinstance(http_servers, list)
     for server in http_servers:
-        callback = server.unhook(subdir)
+        server.unhook(subdir)
         if len(server.callbacks) <= 0 and not configGroup.keepAlive():
             server.shutdown()
             http_servers.remove(server)
diff --git a/src/ircdb.py b/src/ircdb.py
index 28c92fb4e..c1a0528f7 100644
--- a/src/ircdb.py
+++ b/src/ircdb.py
@@ -913,7 +913,7 @@ class IgnoresDB(object):
                 else:
                     expiration = 0
                 self.add(hostmask, expiration)
-            except Exception as e:
+            except Exception:
                 log.error('Invalid line in ignores database: %q', line)
         fd.close()
 
diff --git a/src/irclib.py b/src/irclib.py
index 775ec9f66..fffa6479c 100644
--- a/src/irclib.py
+++ b/src/irclib.py
@@ -42,7 +42,7 @@ except ImportError:
 from . import conf, ircdb, ircmsgs, ircutils, log, utils, world
 from .utils.str import rsplit
 from .utils.iter import chain
-from .utils.structures import queue, smallqueue, RingBuffer
+from .utils.structures import smallqueue, RingBuffer
 
 ###
 # The base class for a callback to be registered with an Irc object.  Shows
@@ -1029,7 +1029,7 @@ class Irc(IrcCommandDispatcher, log.Firewalled):
                     read())
                 authstring = base64.b64encode(
                     private_key.sign(base64.b64decode(msg.args[0].encode()))).decode('utf-8')
-            except (BadDigestError, OSError, ValueError) as e:
+            except (BadDigestError, OSError, ValueError):
                 authstring = "*"
 
             self.sendMsg(ircmsgs.IrcMsg(command='AUTHENTICATE', args=(authstring,)))
diff --git a/src/ircmsgs.py b/src/ircmsgs.py
index ff38a03f2..0ac502c48 100644
--- a/src/ircmsgs.py
+++ b/src/ircmsgs.py
@@ -36,7 +36,6 @@ object (which, as you'll read later, is quite...full-featured :))
 """
 
 import re
-import sys
 import time
 import datetime
 import functools
diff --git a/src/ircutils.py b/src/ircutils.py
index af99be72a..f4df17b31 100644
--- a/src/ircutils.py
+++ b/src/ircutils.py
@@ -50,7 +50,7 @@ from . import utils
 from .utils import minisix
 from .version import version
 
-from .i18n import PluginInternationalization, internationalizeDocstring
+from .i18n import PluginInternationalization
 _ = PluginInternationalization()
 
 def debug(s, *args):
diff --git a/src/log.py b/src/log.py
index 487242c9d..b509823e9 100644
--- a/src/log.py
+++ b/src/log.py
@@ -109,7 +109,7 @@ class StdoutStreamHandler(logging.StreamHandler):
         if conf.supybot.log.stdout() and not conf.daemonized:
             try:
                 logging.StreamHandler.emit(self, record)
-            except ValueError as e: # Raised if sys.stdout is closed.
+            except ValueError: # Raised if sys.stdout is closed.
                 self.disable()
                 error('Error logging to stdout.  Removing stdout handler.')
                 exception('Uncaught exception in StdoutStreamHandler:')
@@ -360,14 +360,14 @@ def firewall(f, errorHandler=None):
     def m(self, *args, **kwargs):
         try:
             return f(self, *args, **kwargs)
-        except Exception as e:
+        except Exception:
             if testing:
                 raise
             logException(self)
             if errorHandler is not None:
                 try:
                     return errorHandler(self, *args, **kwargs)
-                except Exception as e:
+                except Exception:
                     logException(self, 'Uncaught exception in errorHandler')
     m = utils.python.changeFunctionName(m, f.__name__, f.__doc__)
     return m
diff --git a/src/questions.py b/src/questions.py
index cd15e8b12..b7d272c6b 100644
--- a/src/questions.py
+++ b/src/questions.py
@@ -37,7 +37,7 @@ from getpass import getpass as getPass
 
 from . import ansi, utils
 from .utils import minisix
-from supybot.i18n import PluginInternationalization, internationalizeDocstring
+from supybot.i18n import PluginInternationalization
 _ = PluginInternationalization()
 
 useBold = False
diff --git a/src/registry.py b/src/registry.py
index 23a95da89..9a8f7e3ad 100644
--- a/src/registry.py
+++ b/src/registry.py
@@ -30,7 +30,6 @@
 
 import re
 import os
-import sys
 import time
 import json
 import codecs
@@ -148,7 +147,7 @@ def close(registry, filename, private=True):
                                   value._name)
                     try:
                         lines.append('# Default value: %s\n' % x)
-                    except Exception as e:
+                    except Exception:
                         exception('Exception printing default value of %s:' %
                                   value._name)
             lines.append('###\n')
diff --git a/src/schedule.py b/src/schedule.py
index 0749a8c5a..1a66cc98b 100644
--- a/src/schedule.py
+++ b/src/schedule.py
@@ -139,7 +139,7 @@ class Schedule(drivers.IrcDriver):
                 f = self.events.pop(name)
             try:
                 f(*args, **kwargs)
-            except Exception as e:
+            except Exception:
                 log.exception('Uncaught exception in scheduled function:')
 
 
diff --git a/src/test.py b/src/test.py
index 533d84dc7..b52c166b9 100644
--- a/src/test.py
+++ b/src/test.py
@@ -231,9 +231,9 @@ class PluginTestCase(SupyTestCase):
         MiscModule = plugin.loadPluginModule('Misc')
         OwnerModule = plugin.loadPluginModule('Owner')
         ConfigModule = plugin.loadPluginModule('Config')
-        _ = plugin.loadPluginClass(self.irc, MiscModule)
-        _ = plugin.loadPluginClass(self.irc, OwnerModule)
-        _ = plugin.loadPluginClass(self.irc, ConfigModule)
+        plugin.loadPluginClass(self.irc, MiscModule)
+        plugin.loadPluginClass(self.irc, OwnerModule)
+        plugin.loadPluginClass(self.irc, ConfigModule)
         if isinstance(self.plugins, str):
             self.plugins = [self.plugins]
         else:
@@ -241,7 +241,7 @@ class PluginTestCase(SupyTestCase):
                 if name not in ('Owner', 'Misc', 'Config'):
                     module = plugin.loadPluginModule(name,
                                                      ignoreDeprecation=True)
-                    cb = plugin.loadPluginClass(self.irc, module)
+                    plugin.loadPluginClass(self.irc, module)
         self.irc.addCallback(TestInstance)
         for (name, value) in self.config.items():
             group = conf.supybot
diff --git a/src/utils/__init__.py b/src/utils/__init__.py
index bf6e86290..5e2dce60f 100644
--- a/src/utils/__init__.py
+++ b/src/utils/__init__.py
@@ -28,7 +28,6 @@
 # POSSIBILITY OF SUCH DAMAGE.
 ###
 
-import sys
 from . import minisix
 
 ###
diff --git a/src/utils/crypt.py b/src/utils/crypt.py
index a8b493459..f81f02e70 100644
--- a/src/utils/crypt.py
+++ b/src/utils/crypt.py
@@ -27,8 +27,6 @@
 # POSSIBILITY OF SUCH DAMAGE.
 ###
 
-import sys
-
 from hashlib import md5
 from hashlib import sha1 as sha
 
diff --git a/src/utils/file.py b/src/utils/file.py
index 6c3f9f326..768878f48 100644
--- a/src/utils/file.py
+++ b/src/utils/file.py
@@ -35,7 +35,6 @@ import shutil
 import os.path
 
 from . import crypt
-from .iter import ifilter
 
 def contents(filename):
     with open(filename) as fd:
diff --git a/src/utils/gen.py b/src/utils/gen.py
index 56f70ada7..596d5379e 100644
--- a/src/utils/gen.py
+++ b/src/utils/gen.py
@@ -33,8 +33,6 @@ from __future__ import print_function
 import os
 import sys
 import ast
-import time
-import types
 import textwrap
 import warnings
 import functools
@@ -45,7 +43,6 @@ import collections
 from . import crypt
 from .str import format
 from .file import mktemp
-from .iter import imap
 from . import minisix
 from . import internationalization as _
 
@@ -230,24 +227,24 @@ class IterableMap(object):
     __iter__ = items
 
     def keys(self):
-        for (key, _) in self.items():
+        for (key, __) in self.items():
             yield key
 
     def values(self):
-        for (_, value) in self.items():
+        for (__, value) in self.items():
             yield value
 
 
     @warn_non_constant_time
     def __len__(self):
         ret = 0
-        for _ in self.items():
+        for __ in self.items():
             ret += 1
         return ret
 
     @warn_non_constant_time
     def __bool__(self):
-        for _ in self.items():
+        for __ in self.items():
             return True
         return False
     __nonzero__ = __bool__
@@ -300,7 +297,7 @@ class InsensitivePreservingDict(collections.MutableMapping):
 
     def keys(self):
         L = []
-        for (k, _) in self.items():
+        for (k, __) in self.items():
             L.append(k)
         return L
 
@@ -347,7 +344,7 @@ def stackTrace(frame=None, compact=True):
 def callTracer(fd=None, basename=True):
     if fd is None:
         fd = sys.stdout
-    def tracer(frame, event, _):
+    def tracer(frame, event, __):
         if event == 'call':
             code = frame.f_code
             lineno = frame.f_lineno
diff --git a/src/utils/iter.py b/src/utils/iter.py
index 0661f9f32..32e6ebd11 100644
--- a/src/utils/iter.py
+++ b/src/utils/iter.py
@@ -29,7 +29,6 @@
 
 from __future__ import division
 
-import sys
 import random
 
 from itertools import *
diff --git a/src/utils/python.py b/src/utils/python.py
index 59ae3a920..4d28cae71 100644
--- a/src/utils/python.py
+++ b/src/utils/python.py
@@ -32,7 +32,6 @@ import sys
 import types
 import fnmatch
 import threading
-import traceback
 
 def universalImport(*names):
     """Attempt to import the given modules, in order, returning the first
diff --git a/src/utils/str.py b/src/utils/str.py
index cf6f5b039..dbfd83824 100644
--- a/src/utils/str.py
+++ b/src/utils/str.py
@@ -34,13 +34,12 @@ Simple utility functions related to strings.
 """
 
 import re
-import sys
 import time
 import string
 import textwrap
 
 from . import minisix
-from .iter import all, any
+from .iter import any
 from .structures import TwoWayDictionary
 
 from . import internationalization as _
diff --git a/src/utils/structures.py b/src/utils/structures.py
index 0631e46cb..efe7483ec 100644
--- a/src/utils/structures.py
+++ b/src/utils/structures.py
@@ -32,7 +32,6 @@ Data structures for Python.
 """
 
 import time
-import types
 import collections
 
 
diff --git a/src/utils/web.py b/src/utils/web.py
index ad2ab18bf..81fb889eb 100644
--- a/src/utils/web.py
+++ b/src/utils/web.py
@@ -29,7 +29,6 @@
 ###
 
 import re
-import sys
 import base64
 import socket
 
@@ -174,7 +173,7 @@ def getUrl(url, size=None, headers=None, data=None, timeout=None):
             text = fd.read()
         else:
             text = fd.read(size)
-    except socket.timeout as e:
+    except socket.timeout:
         raise Error(TIMED_OUT)
     fd.close()
     return text