diff -r fdaa0e4b7eaf -r 7c23b7de2b8d _gcdebug.py
--- a/_gcdebug.py	Fri Sep 11 14:28:06 2015 +0200
+++ b/_gcdebug.py	Fri Sep 11 14:52:09 2015 +0200
@@ -15,6 +15,7 @@
 #
 # You should have received a copy of the GNU Lesser General Public License along
 # with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
+from __future__ import print_function
 
 import gc, types, weakref
 
@@ -68,7 +69,7 @@
             except KeyError:
                 ocounters[key] = 1
         if isinstance(obj, viewreferrersclasses):
-            print '   ', obj, referrers(obj, showobjs, maxlevel)
+            print('   ', obj, referrers(obj, showobjs, maxlevel))
     garbage = [repr(obj) for obj in gc.garbage]
     return counters, ocounters, garbage