diff --git a/plugins/Channel/plugin.py b/plugins/Channel/plugin.py
index fd591ad28..bdbc5e191 100644
--- a/plugins/Channel/plugin.py
+++ b/plugins/Channel/plugin.py
@@ -808,7 +808,7 @@ class Channel(callbacks.Plugin):
                                      'called %s.'), plugin.name(), command)
         elif command:
             # findCallbackForCommand
-            if filter(None, irc.findCallbacksForArgs([command])):
+            if list(filter(None, irc.findCallbacksForArgs([command]))):
                 s = '-%s' % command
             else:
                 failMsg = format(_('No plugin or command named %s could be '
@@ -847,7 +847,7 @@ class Channel(callbacks.Plugin):
                                      'called %s.'), plugin.name(), command)
         elif command:
             # findCallbackForCommand
-            if filter(None, irc.findCallbacksForArgs([command])):
+            if list(filter(None, irc.findCallbacksForArgs([command]))):
                 s = '-%s' % command
             else:
                 failMsg = format(_('No plugin or command named %s could be '
diff --git a/plugins/Dict/local/dictclient.py b/plugins/Dict/local/dictclient.py
index 64cef4097..fa11a7008 100644
--- a/plugins/Dict/local/dictclient.py
+++ b/plugins/Dict/local/dictclient.py
@@ -149,7 +149,7 @@ class Connection:
         if not hasattr(self, 'dbobjs'):
             self.dbobjs = {}
 
-        if self.dbobjs.has_key(dbname):
+        if dbname in self.dbobjs:
             return self.dbobjs[dbname]
 
         # We use self.dbdescs explicitly since we don't want to
diff --git a/plugins/Google/plugin.py b/plugins/Google/plugin.py
index 2fe2bbdcd..e648e8f4d 100644
--- a/plugins/Google/plugin.py
+++ b/plugins/Google/plugin.py
@@ -162,7 +162,7 @@ class Google(callbacks.PluginRegexp):
         data = self.search(text, msg.args[0], {'smallsearch': True})
         if data['responseData']['results']:
             url = data['responseData']['results'][0]['unescapedUrl']
-            if opts.has_key('snippet'):
+            if 'snippet' in opts:
                 snippet = data['responseData']['results'][0]['content']
                 snippet = " | " + utils.web.htmlToText(snippet, tagReplace='')
             else:
diff --git a/plugins/RSS/plugin.py b/plugins/RSS/plugin.py
index 6bf887a9a..e2929e531 100644
--- a/plugins/RSS/plugin.py
+++ b/plugins/RSS/plugin.py
@@ -181,7 +181,8 @@ class RSS(callbacks.Plugin):
                 #oldresults = self.cachedFeeds[url]
                 #oldheadlines = self.getHeadlines(oldresults)
                 oldheadlines = self.cachedHeadlines[url]
-                oldheadlines = filter(lambda x: t - x[3] < self.registryValue('announce.cachePeriod'), oldheadlines)
+                oldheadlines = list(filter(lambda x: t - x[3] <
+                    self.registryValue('announce.cachePeriod'), oldheadlines))
             except KeyError:
                 oldheadlines = []
             newresults = self.getFeed(url)
@@ -198,7 +199,7 @@ class RSS(callbacks.Plugin):
             for (i, headline) in enumerate(newheadlines):
                 if normalize(headline) in oldheadlinesset:
                     newheadlines[i] = None
-            newheadlines = filter(None, newheadlines) # Removes Nones.
+            newheadlines = list(filter(None, newheadlines)) # Removes Nones.
             number_of_headlines = len(oldheadlines)
             oldheadlines.extend(newheadlines)
             self.cachedHeadlines[url] = oldheadlines
@@ -228,6 +229,7 @@ class RSS(callbacks.Plugin):
                         channelnewheadlines = filter(filter_whitelist, channelnewheadlines)
                     if len(blacklist) != 0:
                         channelnewheadlines = filter(filter_blacklist, channelnewheadlines)
+                    channelnewheadlines = list(channelnewheadlines)
                     if len(channelnewheadlines) == 0:
                         return
                     bold = self.registryValue('bold', channel)
diff --git a/plugins/Topic/plugin.py b/plugins/Topic/plugin.py
index d83593d92..dc1065868 100644
--- a/plugins/Topic/plugin.py
+++ b/plugins/Topic/plugin.py
@@ -105,7 +105,7 @@ addConverter('topicNumber', getTopicNumber)
 addConverter('canChangeTopic', canChangeTopic)
 
 def splitTopic(topic, separator):
-    return filter(None, topic.split(separator))
+    return list(filter(None, topic.split(separator)))
 
 datadir = conf.supybot.directories.data()
 filename = conf.supybot.directories.data.dirize('Topic.pickle')
diff --git a/plugins/Utilities/plugin.py b/plugins/Utilities/plugin.py
index 8d0452603..50f49cf4e 100644
--- a/plugins/Utilities/plugin.py
+++ b/plugins/Utilities/plugin.py
@@ -75,7 +75,7 @@ class Utilities(callbacks.Plugin):
         nested commands to run, but only the output of the last one to be
         returned.
         """
-        args = filter(None, args)
+        args = list(filter(None, args))
         if args:
             irc.reply(args[-1])
         else:
diff --git a/setup.py b/setup.py
index 36648d3fb..070c43c0d 100644
--- a/setup.py
+++ b/setup.py
@@ -148,11 +148,10 @@ try:
                 def log_debug(self, msg, *args):
                     log.debug(msg, *args)
 
-            fixer_names = ['fix_apply', 'fix_basestring', 'fix_buffer',
-                    'fix_callable', 'fix_dict', 'fix_except', 'fix_exec',
-                    'fix_execfile', 'fix_exitfunc', 'fix_filter',
-                    'fix_funcattrs', 'fix_future', 'fix_getcwdu',
-                    'fix_has_key', 'fix_idioms', 'fix_imports', 'fix_imports2',
+            fixer_names = ['fix_basestring',
+                    'fix_dict', 'fix_except',
+                    'fix_funcattrs',
+                    'fix_idioms', 'fix_imports', 'fix_imports2',
                     'fix_input', 'fix_intern', 'fix_isinstance',
                     'fix_itertools', 'fix_itertools_imports', 'fix_long',
                     'fix_map', 'fix_metaclass', 'fix_methodattrs', 'fix_ne',
diff --git a/src/drivers/Socket.py b/src/drivers/Socket.py
index 7045df269..b49c52e74 100644
--- a/src/drivers/Socket.py
+++ b/src/drivers/Socket.py
@@ -82,7 +82,7 @@ class SocketDriver(drivers.IrcDriver, drivers.ServersMixin):
         self.writeCheckTime = None
         self.nextReconnectTime = None
         self.resetDelay()
-        if self.networkGroup.get('ssl').value and not globals().has_key('ssl'):
+        if self.networkGroup.get('ssl').value and 'ssl' not in globals():
             drivers.log.error('The Socket driver can not connect to SSL '
                               'servers for your Python version.  Try the '
                               'Twisted driver instead, or install a Python'
@@ -304,7 +304,7 @@ class SocketDriver(drivers.IrcDriver, drivers.ServersMixin):
         self.conn.settimeout(max(10, conf.supybot.drivers.poll()*10))
         try:
             if getattr(conf.supybot.networks, self.irc.network).ssl():
-                assert globals().has_key('ssl')
+                assert 'ssl' in globals()
                 certfile = getattr(conf.supybot.networks, self.irc.network) \
                         .certfile()
                 if not certfile:
diff --git a/src/i18n.py b/src/i18n.py
index f1aa9d5a4..28d7c5860 100644
--- a/src/i18n.py
+++ b/src/i18n.py
@@ -131,7 +131,7 @@ def reloadLocales():
 i18nSupybot = None
 def PluginInternationalization(name='supybot'):
     # This is a proxy that prevents having several objects for the same plugin
-    if i18nClasses.has_key(name):
+    if name in i18nClasses:
         return i18nClasses[name]
     else:
         return _PluginInternationalization(name)
@@ -276,8 +276,10 @@ class _PluginInternationalization:
         load its functions."""
         if self.name != 'supybot':
             return
+        path = self._getL10nCodePath()
         try:
-            execfile(self._getL10nCodePath())
+            with open(path) as fd:
+                exec(compile(fd.read(), path, 'exec'))
         except IOError: # File doesn't exist
             pass
 
@@ -302,7 +304,7 @@ class _PluginInternationalization:
         if self.name != 'supybot':
             return
         if hasattr(self, '_l10nFunctions') and \
-            self._l10nFunctions.has_key(name):
+                name in self._l10nFunctions:
             return self._l10nFunctions[name]
 
     def internationalizeFunction(self, name):
@@ -351,7 +353,7 @@ def internationalizeDocstring(obj):
     Only useful for commands (commands' docstring is displayed on IRC)"""
     if obj.__doc__ == None:
         return obj
-    if sys.modules[obj.__module__].__dict__.has_key('_'):
+    if '_' in sys.modules[obj.__module__].__dict__:
         internationalizedCommands.update({hash(obj): obj})
         try:
             obj.__doc__=sys.modules[obj.__module__]._.__call__(obj.__doc__)
diff --git a/src/ircdb.py b/src/ircdb.py
index 73dfb0288..1cf3fe4b7 100644
--- a/src/ircdb.py
+++ b/src/ircdb.py
@@ -334,7 +334,7 @@ class IrcUser(object):
                     knownHostmasks.add(mask)
                     return True
                 return False
-            uniqued = filter(uniqueHostmask, reversed(self.auth))
+            uniqued = list(filter(uniqueHostmask, reversed(self.auth)))
             self.auth = list(reversed(uniqued))
         else:
             raise ValueError, 'secure flag set, unmatched hostmask'
diff --git a/src/plugin.py b/src/plugin.py
index 324a38792..5d63800c2 100644
--- a/src/plugin.py
+++ b/src/plugin.py
@@ -54,8 +54,8 @@ def loadPluginModule(name, ignoreDeprecation=False):
             log.warning('Invalid plugin directory: %s; removing.', dir)
             conf.supybot.directories.plugins().remove(dir)
     if name not in files:
-        matched_names = filter(lambda x: re.search(r'(?i)^%s$' % (name,), x),
-                                files)
+        search = lambda x: re.search(r'(?i)^%s$' % (name,), x)
+        matched_names = list(filter(search, files))
         if len(matched_names) == 1:
             name = matched_names[0]
         else:
diff --git a/src/utils/str.py b/src/utils/str.py
index 0e9c18947..8b8aacfef 100644
--- a/src/utils/str.py
+++ b/src/utils/str.py
@@ -218,7 +218,7 @@ def perlReToReplacer(s):
     g = False
     if 'g' in flags:
         g = True
-        flags = filter('g'.__ne__, flags)
+        flags = list(filter('g'.__ne__, flags))
     if isinstance(flags, list):
         flags = ''.join(flags)
     r = perlReToPythonRe(sep.join(('', regexp, flags)))