--- a/mercurial/util.py	Sat Oct 08 08:35:43 2016 -0400
+++ b/mercurial/util.py	Sat Oct 08 08:36:39 2016 -0400
@@ -60,7 +60,8 @@
     'socketserver',
     'xmlrpclib',
 ):
-    globals()[attr] = getattr(pycompat, attr)
+    a = pycompat.sysstr(attr)
+    globals()[a] = getattr(pycompat, a)
 
 # This line is to make pyflakes happy:
 urlreq = pycompat.urlreq

--- a/tests/test-check-py3-compat.t	Sat Oct 08 08:35:43 2016 -0400
+++ b/tests/test-check-py3-compat.t	Sat Oct 08 08:36:39 2016 -0400
@@ -16,121 +16,43 @@
   $ hg files 'set:(**.py) - grep(pygments)' | sed 's|\\|/|g' \
   > | xargs $PYTHON3 contrib/check-py3-compat.py \
   > | sed 's/[0-9][0-9]*)$/*)/'
-  hgext/automv.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/blackbox.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/bugzilla.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/censor.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/chgserver.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/children.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/churn.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/clonebundles.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/color.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
   hgext/convert/bzr.py: error importing module: <SystemError> Parent module 'hgext.convert' not loaded, cannot perform relative import (line *)
-  hgext/convert/common.py: error importing module: <AttributeError> module 'mercurial.util' has no attribute 'pickle' (line *)
-  hgext/convert/convcmd.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
+  hgext/convert/convcmd.py: error importing module: <SystemError> Parent module 'hgext.convert' not loaded, cannot perform relative import (line *)
   hgext/convert/cvs.py: error importing module: <SystemError> Parent module 'hgext.convert' not loaded, cannot perform relative import (line *)
-  hgext/convert/cvsps.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
   hgext/convert/darcs.py: error importing module: <SystemError> Parent module 'hgext.convert' not loaded, cannot perform relative import (line *)
   hgext/convert/filemap.py: error importing module: <SystemError> Parent module 'hgext.convert' not loaded, cannot perform relative import (line *)
   hgext/convert/git.py: error importing module: <SystemError> Parent module 'hgext.convert' not loaded, cannot perform relative import (line *)
   hgext/convert/gnuarch.py: error importing module: <SystemError> Parent module 'hgext.convert' not loaded, cannot perform relative import (line *)
-  hgext/convert/hg.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
+  hgext/convert/hg.py: error importing module: <SystemError> Parent module 'hgext.convert' not loaded, cannot perform relative import (line *)
   hgext/convert/monotone.py: error importing module: <SystemError> Parent module 'hgext.convert' not loaded, cannot perform relative import (line *)
   hgext/convert/p4.py: error importing module: <SystemError> Parent module 'hgext.convert' not loaded, cannot perform relative import (line *)
   hgext/convert/subversion.py: error importing module: <SystemError> Parent module 'hgext.convert' not loaded, cannot perform relative import (line *)
   hgext/convert/transport.py: error importing module: <ImportError> No module named 'svn.client' (line *)
-  hgext/eol.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/extdiff.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/factotum.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
-  hgext/fetch.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
   hgext/fsmonitor/watchmanclient.py: error importing module: <SystemError> Parent module 'hgext.fsmonitor' not loaded, cannot perform relative import (line *)
-  hgext/gpg.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/graphlog.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/hgk.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/histedit.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
-  hgext/journal.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/keyword.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'httpserver' (error at common.py:*)
+  hgext/journal.py: error importing module: <SystemError> Parent module 'hgext' not loaded, cannot perform relative import (line *)
   hgext/largefiles/basestore.py: error importing module: <SystemError> Parent module 'hgext.largefiles' not loaded, cannot perform relative import (line *)
-  hgext/largefiles/lfcommands.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/largefiles/lfutil.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
+  hgext/largefiles/lfcommands.py: error importing module: <SystemError> Parent module 'hgext.largefiles' not loaded, cannot perform relative import (line *)
   hgext/largefiles/localstore.py: error importing module: <SystemError> Parent module 'hgext.largefiles' not loaded, cannot perform relative import (line *)
-  hgext/largefiles/overrides.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/largefiles/proto.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
-  hgext/largefiles/remotestore.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
-  hgext/largefiles/reposetup.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
-  hgext/largefiles/storefactory.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
-  hgext/largefiles/uisetup.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'httpserver' (error at common.py:*)
+  hgext/largefiles/overrides.py: error importing module: <SystemError> Parent module 'hgext.largefiles' not loaded, cannot perform relative import (line *)
+  hgext/largefiles/proto.py: error importing module: <SystemError> Parent module 'hgext.largefiles' not loaded, cannot perform relative import (line *)
+  hgext/largefiles/remotestore.py: error importing module: <SystemError> Parent module 'hgext.largefiles' not loaded, cannot perform relative import (line *)
+  hgext/largefiles/reposetup.py: error importing module: <SystemError> Parent module 'hgext.largefiles' not loaded, cannot perform relative import (line *)
+  hgext/largefiles/storefactory.py: error importing module: <SystemError> Parent module 'hgext.largefiles' not loaded, cannot perform relative import (line *)
+  hgext/largefiles/uisetup.py: error importing module: <SystemError> Parent module 'hgext.largefiles' not loaded, cannot perform relative import (line *)
   hgext/largefiles/wirestore.py: error importing module: <SystemError> Parent module 'hgext.largefiles' not loaded, cannot perform relative import (line *)
-  hgext/mq.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/notify.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/pager.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/patchbomb.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/purge.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/rebase.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/record.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/relink.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/schemes.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/share.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/shelve.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
-  hgext/strip.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  hgext/transplant.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
-  mercurial/archival.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/bundle2.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
-  mercurial/bundlerepo.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
-  mercurial/byterange.py: error importing module: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (line *)
-  mercurial/changelog.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/cmdutil.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/commands.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/context.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/crecord.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/dispatch.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
+  hgext/mq.py: error importing: <TypeError> startswith first arg must be str or a tuple of str, not bytes (error at extensions.py:*)
+  hgext/rebase.py: error importing: <TypeError> Can't convert 'bytes' object to str implicitly (error at registrar.py:*)
+  hgext/record.py: error importing module: <KeyError> '^commit|ci' (line *)
+  hgext/shelve.py: error importing module: <SystemError> Parent module 'hgext' not loaded, cannot perform relative import (line *)
+  hgext/transplant.py: error importing: <TypeError> Can't convert 'bytes' object to str implicitly (error at registrar.py:*)
   mercurial/encoding.py: error importing module: <TypeError> bytes expected, not str (line *)
-  mercurial/exchange.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
-  mercurial/extensions.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/filelog.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/filemerge.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/fileset.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/formatter.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/help.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/hg.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
-  mercurial/hgweb/common.py: error importing module: <SystemError> Parent module 'mercurial.hgweb' not loaded, cannot perform relative import (line *)
-  mercurial/hgweb/hgweb_mod.py: error importing module: <SystemError> Parent module 'mercurial.hgweb' not loaded, cannot perform relative import (line *)
-  mercurial/hgweb/hgwebdir_mod.py: error importing module: <SystemError> Parent module 'mercurial.hgweb' not loaded, cannot perform relative import (line *)
-  mercurial/hgweb/protocol.py: error importing module: <SystemError> Parent module 'mercurial.hgweb' not loaded, cannot perform relative import (line *)
-  mercurial/hgweb/request.py: error importing module: <SystemError> Parent module 'mercurial.hgweb' not loaded, cannot perform relative import (line *)
-  mercurial/hgweb/server.py: error importing module: <SystemError> Parent module 'mercurial.hgweb' not loaded, cannot perform relative import (line *)
-  mercurial/hgweb/webcommands.py: error importing module: <SystemError> Parent module 'mercurial.hgweb' not loaded, cannot perform relative import (line *)
-  mercurial/hgweb/webutil.py: error importing module: <SystemError> Parent module 'mercurial.hgweb' not loaded, cannot perform relative import (line *)
-  mercurial/hgweb/wsgicgi.py: error importing module: <SystemError> Parent module 'mercurial.hgweb' not loaded, cannot perform relative import (line *)
-  mercurial/hook.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/httpconnection.py: error importing module: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (line *)
-  mercurial/httppeer.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
+  mercurial/fileset.py: error importing: <TypeError> Can't convert 'bytes' object to str implicitly (error at registrar.py:*)
   mercurial/i18n.py: error importing module: <TypeError> bytes expected, not str (line *)
-  mercurial/keepalive.py: error importing module: <AttributeError> module 'mercurial.util' has no attribute 'httplib' (line *)
-  mercurial/localrepo.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
-  mercurial/manifest.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/merge.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/namespaces.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/patch.py: error importing module: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (line *)
-  mercurial/pvec.py: error importing module: <NameError> name 'xrange' is not defined (line *)
-  mercurial/repair.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
-  mercurial/revlog.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
   mercurial/revset.py: error importing module: <AttributeError> 'dict' object has no attribute 'iteritems' (line *)
   mercurial/scmwindows.py: error importing module: <ImportError> No module named 'winreg' (line *)
-  mercurial/sshpeer.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
-  mercurial/sshserver.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/statichttprepo.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at byterange.py:*)
-  mercurial/store.py: error importing module: <NameError> name 'xrange' is not defined (line *)
-  mercurial/subrepo.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/templatefilters.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/templatekw.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/templater.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/ui.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/unionrepo.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'stringio' (error at patch.py:*)
-  mercurial/url.py: error importing: <AttributeError> module 'mercurial.util' has no attribute 'urlerr' (error at httpconnection.py:*)
+  mercurial/store.py: error importing module: <TypeError> Can't convert 'bytes' object to str implicitly (line *)
   mercurial/win32.py: error importing module: <ImportError> No module named 'msvcrt' (line *)
   mercurial/windows.py: error importing module: <ImportError> No module named 'msvcrt' (line *)
-  mercurial/wireproto.py: error importing: <TypeError> %b requires bytes, or an object that implements __bytes__, not 'str' (error at bundle2.py:*)
 
 #endif