diff --git a/mercurial/pycompat.py b/mercurial/pycompat.py
--- a/mercurial/pycompat.py
+++ b/mercurial/pycompat.py
@@ -10,53 +10,26 @@ This contains aliases to hide python ver
 
 from __future__ import absolute_import
 
-try:
+import sys
+
+if sys.version_info[0] < 3:
     import cPickle as pickle
-    pickle.dumps
-except ImportError:
-    import pickle
-    pickle.dumps # silence pyflakes
-
-try:
+    import cStringIO as io
     import httplib
-    httplib.HTTPException
-except ImportError:
-    import http.client as httplib
-    httplib.HTTPException
-
-try:
+    import Queue as _queue
     import SocketServer as socketserver
-    socketserver.ThreadingMixIn
-except ImportError:
-    import socketserver
-    socketserver.ThreadingMixIn
-
-try:
+    import urlparse
     import xmlrpclib
-    xmlrpclib.Transport
-except ImportError:
+else:
+    import http.client as httplib
+    import io
+    import pickle
+    import queue as _queue
+    import socketserver
+    import urllib.parse as urlparse
     import xmlrpc.client as xmlrpclib
-    xmlrpclib.Transport
-
-try:
-    import urlparse
-    urlparse.urlparse
-except ImportError:
-    import urllib.parse as urlparse
-    urlparse.urlparse
 
-try:
-    import cStringIO as io
-    stringio = io.StringIO
-except ImportError:
-    import io
-    stringio = io.StringIO
-
-try:
-    import Queue as _queue
-    _queue.Queue
-except ImportError:
-    import queue as _queue
+stringio = io.StringIO
 empty = _queue.Empty
 queue = _queue.Queue
 
diff --git a/tests/test-check-pyflakes.t b/tests/test-check-pyflakes.t
--- a/tests/test-check-pyflakes.t
+++ b/tests/test-check-pyflakes.t
@@ -6,7 +6,9 @@
 run pyflakes on all tracked files ending in .py or without a file ending
 (skipping binary file random-seed)
 
-  $ hg locate 'set:**.py or grep("^#!.*python")' 2>/dev/null \
+  $ hg locate 'set:**.py or grep("^#!.*python")' \
+  > -X mercurial/pycompat.py \
+  > 2>/dev/null \
   > | xargs pyflakes 2>/dev/null | "$TESTDIR/filterpyflakes.py"
   tests/filterpyflakes.py:61: undefined name 'undefinedname'