diff --git a/contrib/churn.py b/contrib/churn.py
--- a/contrib/churn.py
+++ b/contrib/churn.py
@@ -11,7 +11,7 @@
 #
 # <alias email> <actual email>
 
-import time, sys, signal, os
+import sys
 from mercurial.i18n import gettext as _
 from mercurial import hg, mdiff, cmdutil, ui, util, templater, node
 
diff --git a/hgext/hgk.py b/hgext/hgk.py
--- a/hgext/hgk.py
+++ b/hgext/hgk.py
@@ -5,7 +5,7 @@
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
-import time, sys, signal, os
+import sys, os
 from mercurial import hg, fancyopts, commands, ui, util, patch, revlog
 
 def difftree(ui, repo, node1=None, node2=None, *files, **opts):
diff --git a/hgext/mq.py b/hgext/mq.py
--- a/hgext/mq.py
+++ b/hgext/mq.py
@@ -31,7 +31,7 @@ refresh contents of top applied patch   
 
 from mercurial.i18n import _
 from mercurial import commands, cmdutil, hg, patch, revlog, util, changegroup
-import os, sys, re, struct, traceback, errno, bz2
+import os, sys, re, errno
 
 commands.norepo += " qclone qversion"
 
diff --git a/hgext/patchbomb.py b/hgext/patchbomb.py
--- a/hgext/patchbomb.py
+++ b/hgext/patchbomb.py
@@ -63,7 +63,7 @@
 #
 # That should be all.  Now your patchbomb is on its way out.
 
-import os, errno, popen2, socket, sys, tempfile, time
+import os, errno, socket, time
 import email.MIMEMultipart, email.MIMEText, email.Utils
 from mercurial import cmdutil, commands, hg, mail, ui, patch
 from mercurial.i18n import _
diff --git a/mercurial/hgweb/request.py b/mercurial/hgweb/request.py
--- a/mercurial/hgweb/request.py
+++ b/mercurial/hgweb/request.py
@@ -6,7 +6,7 @@
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
-import socket, sys, cgi, os, errno
+import socket, cgi, errno
 from mercurial.i18n import gettext as _
 
 class wsgiapplication(object):
diff --git a/mercurial/mail.py b/mercurial/mail.py
--- a/mercurial/mail.py
+++ b/mercurial/mail.py
@@ -6,7 +6,7 @@
 # of the GNU General Public License, incorporated herein by reference.
 
 from i18n import _
-import os, re, smtplib, templater, util
+import os, smtplib, templater, util
 
 def _smtp(ui):
     '''send mail using smtp.'''
diff --git a/mercurial/patch.py b/mercurial/patch.py
--- a/mercurial/patch.py
+++ b/mercurial/patch.py
@@ -8,7 +8,7 @@
 from i18n import _
 from node import *
 import base85, cmdutil, mdiff, util
-import cStringIO, email.Parser, errno, os, popen2, re, shutil, sha
+import cStringIO, email.Parser, os, popen2, re, sha
 import sys, tempfile, zlib
 
 # helper functions