diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -31,7 +31,6 @@ def add(ui, repo, *pats, **opts):
     """
 
     bad = []
-    exacts = {}
     names = []
     m = cmdutil.match(repo, pats, opts)
     oldbad = m.bad
diff --git a/mercurial/dispatch.py b/mercurial/dispatch.py
--- a/mercurial/dispatch.py
+++ b/mercurial/dispatch.py
@@ -194,8 +194,6 @@ class cmdalias(object):
 
         args = shlex.split(self.definition)
         cmd = args.pop(0)
-        opts = []
-        help = ''
 
         try:
             self.fn, self.opts, self.help = cmdutil.findcmd(cmd, cmdtable, False)[1]
diff --git a/mercurial/extensions.py b/mercurial/extensions.py
--- a/mercurial/extensions.py
+++ b/mercurial/extensions.py
@@ -181,7 +181,6 @@ def enabled():
     '''return a dict of {name: desc} of extensions, and the max name length'''
     exts = {}
     maxlength = 0
-    exthelps = []
     for ename, ext in extensions():
         doc = (gettext(ext.__doc__) or _('(no help text available)'))
         ename = ename.split('.')[-1]
diff --git a/mercurial/revlog.py b/mercurial/revlog.py
--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -466,7 +466,7 @@ class revlog(object):
         if i:
             try:
                 d = self._io.parseindex(f, i, self._inline)
-            except (ValueError, IndexError), e:
+            except (ValueError, IndexError):
                 raise RevlogError(_("index %s is corrupted") % (self.indexfile))
             self.index, self.nodemap, self._chunkcache = d
             if not self._chunkcache: